From a456b6b1d4176549f181760fbf4f2948d12a745c Mon Sep 17 00:00:00 2001
From: Luca Sbardella <luca@quantmind.com>
Date: Thu, 20 Jul 2023 15:37:39 +0100
Subject: [PATCH 1/6] mypy

---
 Makefile                      |  14 +-
 ccy/__init__.py               |   5 +-
 ccy/core/country.py           |  37 +-
 ccy/core/currency.py          |  84 ++---
 ccy/core/data.py              | 112 +++---
 ccy/core/daycounter.py        |  35 +-
 ccy/dates/converters.py       |   2 +-
 ccy/tradingcentres/centres.py |  13 +-
 dev/lint                      |  17 +-
 poetry.lock                   | 690 +++++++++++++---------------------
 pyproject.toml                |  25 +-
 11 files changed, 442 insertions(+), 592 deletions(-)

diff --git a/Makefile b/Makefile
index 5cba8d7..e860c13 100644
--- a/Makefile
+++ b/Makefile
@@ -19,14 +19,16 @@ install:	## install packages for development
 	@pip install -U pip poetry
 	@poetry install
 
-lint:		## run linters
-	@poetry run dev/lint
+lint:		## Run linters
+	@poetry run ./dev/lint fix
+
+
+lint-check:	## Run linters in check mode
+	@poetry run ./dev/lint
+
 
 test:		## test with python 3.8 with coverage
 	@poetry run pytest -x -v --cov --cov-report xml
 
-codecov:	## upload code coverage
-	@poetry run codecov --token $(CODECOV_TOKEN) --file ./build/coverage.xml
-
-publish:		## release to pypi and github tag
+publish:	## release to pypi and github tag
 	@poetry publish --build -u lsbardel -p $(PYPI_PASSWORD)
diff --git a/ccy/__init__.py b/ccy/__init__.py
index 7229baf..297b168 100644
--- a/ccy/__init__.py
+++ b/ccy/__init__.py
@@ -1,6 +1,6 @@
 """Python currencies"""
 
-__version__ = "1.3.0"
+__version__ = "1.4.0"
 
 
 from .core.country import (
@@ -21,7 +21,7 @@
     currencydb,
     dump_currency_table,
 )
-from .core.daycounter import ActActYears, alldc, getdc
+from .core.daycounter import alldc, getdc
 from .dates.converters import (
     date2juldate,
     date2timestamp,
@@ -44,7 +44,6 @@
     "dump_currency_table",
     #
     "getdc",
-    "ActActYears",
     "alldc",
     #
     "country",
diff --git a/ccy/core/country.py b/ccy/core/country.py
index 4405c15..bf52d27 100644
--- a/ccy/core/country.py
+++ b/ccy/core/country.py
@@ -1,6 +1,7 @@
-#
-# Requires pytz 2008i or higher
-#
+from __future__ import annotations
+
+from typing import Protocol
+
 from .currency import currencydb
 
 # Eurozone countries (officially the euro area)
@@ -18,11 +19,17 @@ def print_eurozone():
         print(c)
 
 
-_countries = None
+_countries: dict[str, Country] = {}
 _country_ccys = None
 _country_maps = {}
 
 
+class Country(Protocol):
+    alpha_2: str
+    name: str
+    alpha_3: str = ""
+
+
 class CountryError(Exception):
     pass
 
@@ -39,19 +46,16 @@ def countryccy(code):
     return cdb.get(code, None)
 
 
-def countries():
+def countries() -> dict[str, Country]:
     """
-    get country dictionar from pytz and add some extra.
+    get country dictionary from pytz and add some extra.
     """
     global _countries
     if not _countries:
-        v = {}
-        _countries = v
         try:
-            from pytz import country_names
+            import pycountry
 
-            for k, n in country_names.items():
-                v[k.upper()] = n
+            _countries = {country.alpha_2: country for country in pycountry.countries}
         except Exception:
             pass
     return _countries
@@ -106,7 +110,7 @@ def set_country_map(cfrom, cto, name=None, replace=True):
         raise CountryError("Country %s not in database" % c)
 
 
-def set_new_country(code, ccy, name):
+def set_new_country(code: str, ccy: str, name: str) -> None:
     """
     Add new country code to database
     """
@@ -118,7 +122,12 @@ def set_new_country(code, ccy, name):
     ccy = str(ccy).upper()
     if ccy not in ccys:
         raise CountryError("Currency %s not in database" % ccy)
-    cdb[code] = str(name)
+    # hacky - but best way I could find
+    cdb[code] = type(cdb["IT"])(
+        alpha_2=code,
+        name=name,
+        official_name=name,
+    )  # type: ignore
     cccys = countryccys()
     cccys[code] = ccy
 
@@ -133,4 +142,6 @@ def country_map(code):
 
 
 # Add eurozone to list of Countries
+set_new_country("EZ", "EUR", "Eurozone")
+# lagacy - to remove
 set_new_country("EU", "EUR", "Eurozone")
diff --git a/ccy/core/currency.py b/ccy/core/currency.py
index e1f1b7b..7324b91 100644
--- a/ccy/core/currency.py
+++ b/ccy/core/currency.py
@@ -1,4 +1,5 @@
 import sys
+from typing import NamedTuple
 
 from .data import make_ccys
 
@@ -20,51 +21,25 @@ def overusdfuni(v1):
     return 1.0 / v1
 
 
-class ccy(object):
-    """
-    Currency object
-    """
-
-    def __init__(
-        self,
-        code,
-        isonumber,
-        twoletterscode,
-        order,
-        name,
-        roundoff=4,
-        default_country=None,
-        fixeddc=None,
-        floatdc=None,
-        fixedfreq=None,
-        floatfreq=None,
-        future=None,
-        symbol=r"\00a4",
-        html="",
-    ):
-        self.code = to_string(code)
-        self.id = self.code
-        self.isonumber = isonumber
-        self.twoletterscode = to_string(twoletterscode)
-        self.order = int(order)
-        self.name = to_string(name)
-        self.rounding = roundoff
-        self.default_country = default_country
-        self.symbol_raw = symbol
-        self.symbol = symbol.encode("utf-8").decode("unicode_escape")
-        self.html = html or self.symbol
-        self.fixeddc = fixeddc
-        self.floatdc = floatdc
-        self.future = ""
-        if future:
-            self.future = str(future)
-
-    def __getstate__(self):
-        return {"code": self.code}
-
-    def __setstate__(self, dict):
-        c = currency(dict["code"])
-        self.__dict__.update(c.__dict__)
+class ccy(NamedTuple):
+    code: SyntaxError
+    isonumber: str
+    twoletterscode: str
+    order: int
+    name: str
+    rounding: int
+    default_country: str
+    fixeddc: str = "Act/365"
+    floatdc: str = "Act/365"
+    fixedfreq: str = ""
+    floatfreq: str = ""
+    future: str = ""
+    symbol_raw: str = r"\00a4"
+    html: str = ""
+
+    @property
+    def symbol(self) -> str:
+        return self.symbol_raw.encode("utf-8").decode("unicode_escape")
 
     def __eq__(self, other):
         if isinstance(other, ccy):
@@ -149,7 +124,7 @@ def spot(self, c2, v1, v2):
         return v1 / v2
 
 
-class ccy_pair(object):
+class ccy_pair(NamedTuple):
     """
     Currency pair such as EURUSD, USDCHF
 
@@ -158,11 +133,12 @@ class ccy_pair(object):
     XXXYYY means 1 unit of of XXX cost XXXYYY units of YYY
     """
 
-    def __init__(self, c1, c2):
-        self.ccy1 = c1
-        self.ccy2 = c2
-        self.code = "%s%s" % (c1, c2)
-        self.id = self.code
+    ccy1: ccy
+    ccy2: ccy
+
+    @property
+    def code(self):
+        return "%s%s" % (self.ccy1, self.ccy2)
 
     def __repr__(self):
         return "%s: %s" % (self.__class__.__name__, self.code)
@@ -186,13 +162,13 @@ def over(self, name="usd"):
             return self
 
 
-class ccydb(dict):
+class ccydb(dict[str, ccy]):
     def insert(self, *args, **kwargs):
         c = ccy(*args, **kwargs)
         self[c.code] = c
 
 
-def currencydb():
+def currencydb() -> ccydb:
     global _ccys
     if not _ccys:
         _ccys = ccydb()
@@ -266,5 +242,5 @@ def dump_currency_table():
     return all
 
 
-_ccys = None
+_ccys: ccydb = ccydb()
 _ccypairs = None
diff --git a/ccy/core/data.py b/ccy/core/data.py
index dcaf03f..c9c9cb6 100644
--- a/ccy/core/data.py
+++ b/ccy/core/data.py
@@ -1,4 +1,12 @@
-def make_ccys(db):
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from .currency import ccydb
+
+
+def make_ccys(db: ccydb):
     """
     Create the currency dictionary
     """
@@ -20,7 +28,7 @@ def make_ccys(db):
         "30/360",
         "ACT/360",
         future="FE",
-        symbol=r"\u20ac",
+        symbol_raw=r"\u20ac",
         html="&#x20ac;",
     )
     insert(
@@ -33,7 +41,7 @@ def make_ccys(db):
         "GB",
         "ACT/365",
         "ACT/365",
-        symbol=r"\u00a3",
+        symbol_raw=r"\u00a3",
         html="&#xa3;",
     )
     insert(
@@ -46,7 +54,7 @@ def make_ccys(db):
         "AU",
         "ACT/365",
         "ACT/365",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     insert(
@@ -59,7 +67,7 @@ def make_ccys(db):
         "NZ",
         "ACT/365",
         "ACT/365",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     insert(
@@ -73,7 +81,7 @@ def make_ccys(db):
         "30/360",
         "ACT/360",
         future="ED",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     insert(
@@ -86,7 +94,7 @@ def make_ccys(db):
         "CA",
         "ACT/365",
         "ACT/365",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     insert(
@@ -99,7 +107,7 @@ def make_ccys(db):
         "CH",
         "30/360",
         "ACT/360",
-        symbol=r"Fr",
+        symbol_raw=r"Fr",
         html="&#x20a3;",
     )
     insert(
@@ -112,7 +120,7 @@ def make_ccys(db):
         "NO",
         "30/360",
         "ACT/360",
-        symbol=kr,
+        symbol_raw=kr,
         html=kr,
     )
     insert(
@@ -125,7 +133,7 @@ def make_ccys(db):
         "SE",
         "30/360",
         "ACT/360",
-        symbol=kr,
+        symbol_raw=kr,
         html=kr,
     )
     insert(
@@ -138,7 +146,7 @@ def make_ccys(db):
         "DK",
         "30/360",
         "ACT/360",
-        symbol=kr,
+        symbol_raw=kr,
         html=kr,
     )
     insert(
@@ -151,7 +159,7 @@ def make_ccys(db):
         "JP",
         "ACT/365",
         "ACT/360",
-        symbol=r"\u00a5",
+        symbol_raw=r"\u00a5",
         html="&#xa5;",
     )
 
@@ -166,7 +174,7 @@ def make_ccys(db):
         "CN",
         "ACT/365",
         "ACT/365",
-        symbol=r"\u00a5",
+        symbol_raw=r"\u00a5",
         html="&#xa5;",
     )
     insert(
@@ -179,7 +187,7 @@ def make_ccys(db):
         "KR",
         "ACT/365",
         "ACT/365",
-        symbol=r"\u20a9",
+        symbol_raw=r"\u20a9",
         html="&#x20a9;",
     )
     insert(
@@ -192,7 +200,7 @@ def make_ccys(db):
         "SG",
         "ACT/365",
         "ACT/365",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     insert(
@@ -205,7 +213,7 @@ def make_ccys(db):
         "ID",
         "ACT/360",
         "ACT/360",
-        symbol=r"Rp",
+        symbol_raw=r"Rp",
         html="Rp",
     )
     insert(
@@ -218,7 +226,7 @@ def make_ccys(db):
         "TH",
         "ACT/365",
         "ACT/365",
-        symbol=r"\u0e3f",
+        symbol_raw=r"\u0e3f",
         html="&#xe3f;",
     )
     insert(
@@ -231,7 +239,7 @@ def make_ccys(db):
         "TW",
         "ACT/365",
         "ACT/365",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     insert(
@@ -244,7 +252,7 @@ def make_ccys(db):
         "HK",
         "ACT/365",
         "ACT/365",
-        symbol=r"\u5713",
+        symbol_raw=r"\u5713",
         html="HK&#x24;",
     )
     insert(
@@ -257,7 +265,7 @@ def make_ccys(db):
         "PH",
         "ACT/360",
         "ACT/360",
-        symbol=peso,
+        symbol_raw=peso,
         html="&#x20b1;",
     )
     insert(
@@ -270,7 +278,7 @@ def make_ccys(db):
         "IN",
         "ACT/365",
         "ACT/365",
-        symbol=r"\u20a8",
+        symbol_raw=r"\u20a8",
         html="&#x20a8;",
     )
     insert(
@@ -286,7 +294,7 @@ def make_ccys(db):
         "VN",
         "ACT/365",
         "ACT/365",
-        symbol=r"\u20ab",
+        symbol_raw=r"\u20ab",
         html="&#x20ab;",
     )
 
@@ -301,7 +309,7 @@ def make_ccys(db):
         "BR",
         "BUS/252",
         "BUS/252",
-        symbol=r"R$",
+        symbol_raw=r"R$",
     )
     insert(
         "PEN",
@@ -313,7 +321,7 @@ def make_ccys(db):
         "PE",
         "ACT/360",
         "ACT/360",
-        symbol=r"S/.",
+        symbol_raw=r"S/.",
     )
     insert(
         "ARS",
@@ -325,7 +333,7 @@ def make_ccys(db):
         "AR",
         "30/360",
         "ACT/360",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     insert(
@@ -338,7 +346,7 @@ def make_ccys(db):
         "MX",
         "ACT/360",
         "ACT/360",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     insert(
@@ -351,7 +359,7 @@ def make_ccys(db):
         "CL",
         "ACT/360",
         "ACT/360",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     insert(
@@ -364,7 +372,7 @@ def make_ccys(db):
         "CO",
         "ACT/360",
         "ACT/360",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     # TODO: Check towletters code and position
@@ -378,7 +386,7 @@ def make_ccys(db):
         "JM",
         "ACT/360",
         "ACT/360",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     # TODO: Check towletters code and position
@@ -392,7 +400,7 @@ def make_ccys(db):
         "TT",
         "ACT/360",
         "ACT/360",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
     # TODO: Check towletters code and position
@@ -404,7 +412,7 @@ def make_ccys(db):
         "Bermudian Dollar",
         dfr,
         "BM",
-        symbol=dollar,
+        symbol_raw=dollar,
         html="&#x24;",
     )
 
@@ -419,7 +427,7 @@ def make_ccys(db):
         "CZ",
         "ACT/360",
         "ACT/360",
-        symbol=r"\u004b\u010d",
+        symbol_raw=r"\u004b\u010d",
     )
     insert(
         "PLN",
@@ -431,7 +439,7 @@ def make_ccys(db):
         "PL",
         "ACT/ACT",
         "ACT/365",
-        symbol=r"\u0050\u0142",
+        symbol_raw=r"\u0050\u0142",
     )
     insert(
         "TRY",
@@ -443,7 +451,7 @@ def make_ccys(db):
         "TR",
         "ACT/360",
         "ACT/360",
-        symbol=r"\u0054\u004c",
+        symbol_raw=r"\u0054\u004c",
     )
     insert(
         "HUF",
@@ -455,7 +463,7 @@ def make_ccys(db):
         "HU",
         "ACT/365",
         "ACT/360",
-        symbol=r"Ft",
+        symbol_raw=r"Ft",
         html="Ft",
     )
     insert("RON", "946", "RN", 34, "Romanian Leu", dfr, "RO", "ACT/360", "ACT/360")
@@ -469,7 +477,7 @@ def make_ccys(db):
         "UA",
         "ACT/ACT",
         "ACT/ACT",
-        symbol=r"\u20b4",
+        symbol_raw=r"\u20b4",
         html="&#x20b4;",
     )
     insert(
@@ -482,13 +490,21 @@ def make_ccys(db):
         "RU",
         "ACT/ACT",
         "ACT/ACT",
-        symbol=r"\u0440\u0443\u0431",
+        symbol_raw=r"\u0440\u0443\u0431",
     )
     # TODO: Check towletters code and position
-    insert("HRK", "191", "HK", 410, "Croatian kuna", dfr, "HR", symbol=r"kn")
+    insert("HRK", "191", "HK", 410, "Croatian kuna", dfr, "HR", symbol_raw=r"kn")
     # TODO: Check towletters code and position
     insert(
-        "KZT", "398", "KT", 410, "Tenge", dfr, "KZ", symbol=r"\u20b8", html="&#x20b8;"
+        "KZT",
+        "398",
+        "KT",
+        410,
+        "Tenge",
+        dfr,
+        "KZ",
+        symbol_raw=r"\u20b8",
+        html="&#x20b8;",
     )
     # TODO: Check towletters code and position
     insert(
@@ -499,7 +515,7 @@ def make_ccys(db):
         "Bulgarian Lev",
         dfr,
         "BG",
-        symbol=r"\u043b\u0432.",
+        symbol_raw=r"\u043b\u0432.",
         html="&#1083;&#1074;",
     )
 
@@ -514,7 +530,7 @@ def make_ccys(db):
         "IL",
         "ACT/365",
         "ACT/365",
-        symbol=r"\u20aa",
+        symbol_raw=r"\u20aa",
         html="&#x20aa;",
     )
     # TODO: Check towletters code and position
@@ -528,7 +544,7 @@ def make_ccys(db):
         "Qatari Riyal",
         dfr,
         "QA",
-        symbol=r"\ufdfc",
+        symbol_raw=r"\ufdfc",
         html="&#xfdfc;",
     )
     # TODO: Check towletters code and position
@@ -540,7 +556,7 @@ def make_ccys(db):
         "Saudi Riyal",
         dfr,
         "SA",
-        symbol=r"\ufdfc",
+        symbol_raw=r"\ufdfc",
         html="&#xfdfc;",
     )
     insert(
@@ -551,7 +567,7 @@ def make_ccys(db):
         "Egyptian Pound",
         dfr,
         "EG",
-        symbol=r"\u00a3",
+        symbol_raw=r"\u00a3",
         html="&#xa3;",
     )
     insert(
@@ -562,7 +578,7 @@ def make_ccys(db):
         "Nigerian Naira",
         dfr,
         "NG",
-        symbol=r"\u20a6",
+        symbol_raw=r"\u20a6",
         html="&#x20A6;",
     )
     insert(
@@ -575,9 +591,11 @@ def make_ccys(db):
         "ZA",
         "ACT/365",
         "ACT/365",
-        symbol=r"R",
+        symbol_raw=r"R",
         html="R",
     )
 
     # BITCOIN
-    insert("XBT", "000", "BT", -1, "Bitcoin", 8, "WW", symbol=r"\u0e3f", html="&#xe3f;")
+    insert(
+        "XBT", "000", "BT", -1, "Bitcoin", 8, "WW", symbol_raw=r"\u0e3f", html="&#xe3f;"
+    )
diff --git a/ccy/core/daycounter.py b/ccy/core/daycounter.py
index f4e6633..c30a264 100644
--- a/ccy/core/daycounter.py
+++ b/ccy/core/daycounter.py
@@ -6,13 +6,15 @@
     * 30 / 360
     * Actual Actual
 """
+from __future__ import annotations
+
 from copy import copy
 from datetime import date
 
-__all__ = ["getdc", "ActActYears", "alldc"]
+__all__ = ["getdc", "DayCounter", "alldc"]
 
 
-def getdc(name):
+def getdc(name: str) -> DayCounter | None:
     dc = _day_counters.get(name)
     if dc:
         return dc()
@@ -25,7 +27,7 @@ def alldc():
     return copy(_day_counters)
 
 
-def ActActYears(dt):
+def act_act_years(dt: date) -> float:
     y = dt.year
     r = y % 4
     a = 0.0
@@ -43,42 +45,41 @@ def __new__(cls, name, bases, attrs):
         return new_class
 
 
-_day_counters = {}
+_day_counters: dict[str, DayCounterMeta] = {}
 
 
-class DayCounter(object):
-    name = None
-    __metaclass__ = DayCounterMeta
+class DayCounter(DayCounterMeta):
+    name: str = ""
 
-    def count(self, start, end):
+    def count(self, start: date, end: date) -> int:
         return (end - start).days
 
-    def dcf(self, start, end):
+    def dcf(self, start: date, end: date) -> float:
         return self.count(start, end) / 360.0
 
 
-class act360(DayCounter):
+class Act360(DayCounter):
     name = "ACT/360"
 
 
-class act365(DayCounter):
+class Act365(DayCounter):
     name = "ACT/365"
 
-    def dcf(self, start, end):
+    def dcf(self, start: date, end: date):
         return self.count(start, end) / 365.0
 
 
-class thirty360(DayCounter):
+class Thirty360(DayCounter):
     name = "30/360"
 
-    def count(self, start, end):
+    def dcf(self, start: date, end: date) -> float:
         d1 = min(start.day, 30)
         d2 = min(end.day, 30)
         return 360 * (end.year - start.year) + 30 * (end.month - start.month) + d2 - d1
 
 
-class actact(DayCounter):
+class ActAct(DayCounter):
     name = "ACT/ACT"
 
-    def dcf(self, start, end):
-        return ActActYears(end) - ActActYears(start)
+    def dcf(self, start: date, end: date) -> float:
+        return act_act_years(end) - act_act_years(start)
diff --git a/ccy/dates/converters.py b/ccy/dates/converters.py
index 9c5b097..32736b0 100644
--- a/ccy/dates/converters.py
+++ b/ccy/dates/converters.py
@@ -5,7 +5,7 @@
     from dateutil.parser import parse as date_from_string
 except ImportError:  # noqa
 
-    def date_from_string(dte):
+    def date_from_string(dte):  # type: ignore
         raise NotImplementedError
 
 
diff --git a/ccy/tradingcentres/centres.py b/ccy/tradingcentres/centres.py
index 63627ae..c74240d 100644
--- a/ccy/tradingcentres/centres.py
+++ b/ccy/tradingcentres/centres.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import datetime
 
 from .holiday import BaseHoliday, PartialDate
@@ -10,7 +12,7 @@
 isoweekend = (6, 7)
 oneday = datetime.timedelta(days=1)
 
-_tcs = {}
+_tcs: dict[str, TradingCentreMeta] = {}
 
 
 def centres(codes=None):
@@ -54,12 +56,7 @@ def __new__(cls, name, bases, attrs):
             return new_class
 
 
-TradingCentreBase = TradingCentreMeta(
-    "TradingCentreBase", (object,), {"abstract": True}
-)
-
-
-class TradingCentre(TradingCentreBase):
+class TradingCentre(metaclass=TradingCentreMeta):
     abstract = True
     onedaydelta = datetime.timedelta(days=1)
 
@@ -106,7 +103,7 @@ def build_dates(self, year):
                 self._cache[day] = True
 
 
-class TradingCentres(object):
+class TradingCentres:
     onedaydelta = datetime.timedelta(days=1)
 
     def __init__(self):
diff --git a/dev/lint b/dev/lint
index 3417114..be99b7f 100755
--- a/dev/lint
+++ b/dev/lint
@@ -1,6 +1,17 @@
 #!/usr/bin/env bash
 set -e
 
-isort ccy
-black ccy
-flake8 ccy
+BLACK_ARG="--check"
+RUFF_ARG=""
+
+if [ "$1" = "fix" ] ; then
+    BLACK_ARG=""
+    RUFF_ARG="--fix"
+fi
+
+echo "run black"
+black ccy tests --exclude "fluid_common/protos/v2|fluid_apps/db/migrations" ${BLACK_ARG}
+echo "run ruff"
+ruff ccy tests ${RUFF_ARG}
+echo "run mypy"
+mypy ccy
diff --git a/poetry.lock b/poetry.lock
index 8ec6330..e6f9bb1 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,24 +1,25 @@
-[[package]]
-name = "attrs"
-version = "22.1.0"
-description = "Classes Without Boilerplate"
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[package.extras]
-dev = ["cloudpickle", "coverage[toml] (>=5.0.2)", "furo", "hypothesis", "mypy (>=0.900,!=0.940)", "pre-commit", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "sphinx", "sphinx-notfound-page", "zope.interface"]
-docs = ["furo", "sphinx", "sphinx-notfound-page", "zope.interface"]
-tests = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "zope.interface"]
-tests-no-zope = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins"]
+# This file is automatically @generated by Poetry 1.5.1 and should not be changed by hand.
 
 [[package]]
 name = "black"
-version = "22.10.0"
+version = "22.12.0"
 description = "The uncompromising code formatter."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
+files = [
+    {file = "black-22.12.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:9eedd20838bd5d75b80c9f5487dbcb06836a43833a37846cf1d8c1cc01cef59d"},
+    {file = "black-22.12.0-cp310-cp310-win_amd64.whl", hash = "sha256:159a46a4947f73387b4d83e87ea006dbb2337eab6c879620a3ba52699b1f4351"},
+    {file = "black-22.12.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:d30b212bffeb1e252b31dd269dfae69dd17e06d92b87ad26e23890f3efea366f"},
+    {file = "black-22.12.0-cp311-cp311-win_amd64.whl", hash = "sha256:7412e75863aa5c5411886804678b7d083c7c28421210180d67dfd8cf1221e1f4"},
+    {file = "black-22.12.0-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:c116eed0efb9ff870ded8b62fe9f28dd61ef6e9ddd28d83d7d264a38417dcee2"},
+    {file = "black-22.12.0-cp37-cp37m-win_amd64.whl", hash = "sha256:1f58cbe16dfe8c12b7434e50ff889fa479072096d79f0a7f25e4ab8e94cd8350"},
+    {file = "black-22.12.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:77d86c9f3db9b1bf6761244bc0b3572a546f5fe37917a044e02f3166d5aafa7d"},
+    {file = "black-22.12.0-cp38-cp38-win_amd64.whl", hash = "sha256:82d9fe8fee3401e02e79767016b4907820a7dc28d70d137eb397b92ef3cc5bfc"},
+    {file = "black-22.12.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:101c69b23df9b44247bd88e1d7e90154336ac4992502d4197bdac35dd7ee3320"},
+    {file = "black-22.12.0-cp39-cp39-win_amd64.whl", hash = "sha256:559c7a1ba9a006226f09e4916060982fd27334ae1998e7a38b3f33a37f7a2148"},
+    {file = "black-22.12.0-py3-none-any.whl", hash = "sha256:436cc9167dd28040ad90d3b404aec22cedf24a6e4d7de221bec2730ec0c97bcf"},
+    {file = "black-22.12.0.tar.gz", hash = "sha256:229351e5a18ca30f447bf724d007f890f97e13af070bb6ad4c0a441cd7596a2f"},
+]
 
 [package.dependencies]
 click = ">=8.0.0"
@@ -26,7 +27,6 @@ mypy-extensions = ">=0.4.3"
 pathspec = ">=0.9.0"
 platformdirs = ">=2"
 tomli = {version = ">=1.1.0", markers = "python_full_version < \"3.11.0a7\""}
-typing-extensions = {version = ">=3.10.0.0", markers = "python_version < \"3.10\""}
 
 [package.extras]
 colorama = ["colorama (>=0.4.3)"]
@@ -34,63 +34,99 @@ d = ["aiohttp (>=3.7.4)"]
 jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
 uvloop = ["uvloop (>=0.15.2)"]
 
-[[package]]
-name = "certifi"
-version = "2022.9.24"
-description = "Python package for providing Mozilla's CA Bundle."
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[[package]]
-name = "charset-normalizer"
-version = "2.1.1"
-description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
-category = "dev"
-optional = false
-python-versions = ">=3.6.0"
-
-[package.extras]
-unicode-backport = ["unicodedata2"]
-
 [[package]]
 name = "click"
 version = "8.1.3"
 description = "Composable command line interface toolkit"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
+files = [
+    {file = "click-8.1.3-py3-none-any.whl", hash = "sha256:bb4d8133cb15a609f44e8213d9b391b0809795062913b383c62be0ee95b1db48"},
+    {file = "click-8.1.3.tar.gz", hash = "sha256:7682dc8afb30297001674575ea00d1814d808d6a36af415a82bd481d37ba7b8e"},
+]
 
 [package.dependencies]
 colorama = {version = "*", markers = "platform_system == \"Windows\""}
 
-[[package]]
-name = "codecov"
-version = "2.1.12"
-description = "Hosted coverage reports for GitHub, Bitbucket and Gitlab"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[package.dependencies]
-coverage = "*"
-requests = ">=2.7.9"
-
 [[package]]
 name = "colorama"
 version = "0.4.6"
 description = "Cross-platform colored terminal text."
-category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+files = [
+    {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
+    {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
+]
 
 [[package]]
 name = "coverage"
-version = "6.5.0"
+version = "7.2.7"
 description = "Code coverage measurement for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
+files = [
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+    {file = "coverage-7.2.7-cp39-cp39-win32.whl", hash = "sha256:7ee7d9d4822c8acc74a5e26c50604dff824710bc8de424904c0982e25c39c6cb"},
+    {file = "coverage-7.2.7-cp39-cp39-win_amd64.whl", hash = "sha256:eb393e5ebc85245347950143969b241d08b52b88a3dc39479822e073a1a8eb27"},
+    {file = "coverage-7.2.7-pp37.pp38.pp39-none-any.whl", hash = "sha256:b7b4c971f05e6ae490fef852c218b0e79d4e52f79ef0c8475566584a8fb3e01d"},
+    {file = "coverage-7.2.7.tar.gz", hash = "sha256:924d94291ca674905fe9481f12294eb11f2d3d3fd1adb20314ba89e94f44ed59"},
+]
 
 [package.dependencies]
 tomli = {version = "*", optional = true, markers = "python_full_version <= \"3.11.0a6\" and extra == \"toml\""}
@@ -100,191 +136,180 @@ toml = ["tomli"]
 
 [[package]]
 name = "exceptiongroup"
-version = "1.0.0"
+version = "1.1.2"
 description = "Backport of PEP 654 (exception groups)"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
+files = [
+    {file = "exceptiongroup-1.1.2-py3-none-any.whl", hash = "sha256:e346e69d186172ca7cf029c8c1d16235aa0e04035e5750b4b95039e65204328f"},
+    {file = "exceptiongroup-1.1.2.tar.gz", hash = "sha256:12c3e887d6485d16943a309616de20ae5582633e0a2eda17f4e10fd61c1e8af5"},
+]
 
 [package.extras]
 test = ["pytest (>=6)"]
 
-[[package]]
-name = "flake8"
-version = "5.0.4"
-description = "the modular source code checker: pep8 pyflakes and co"
-category = "dev"
-optional = false
-python-versions = ">=3.6.1"
-
-[package.dependencies]
-mccabe = ">=0.7.0,<0.8.0"
-pycodestyle = ">=2.9.0,<2.10.0"
-pyflakes = ">=2.5.0,<2.6.0"
-
-[[package]]
-name = "flake8-blind-except"
-version = "0.2.1"
-description = "A flake8 extension that checks for blind except: statements"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "flake8-commas"
-version = "2.1.0"
-description = "Flake8 lint for trailing commas."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-flake8 = ">=2"
-
-[[package]]
-name = "idna"
-version = "3.4"
-description = "Internationalized Domain Names in Applications (IDNA)"
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
 [[package]]
 name = "iniconfig"
-version = "1.1.1"
-description = "iniconfig: brain-dead simple config-ini parsing"
-category = "dev"
+version = "2.0.0"
+description = "brain-dead simple config-ini parsing"
 optional = false
-python-versions = "*"
+python-versions = ">=3.7"
+files = [
+    {file = "iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"},
+    {file = "iniconfig-2.0.0.tar.gz", hash = "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3"},
+]
 
 [[package]]
 name = "isort"
-version = "5.10.1"
+version = "5.12.0"
 description = "A Python utility / library to sort Python imports."
-category = "dev"
 optional = false
-python-versions = ">=3.6.1,<4.0"
+python-versions = ">=3.8.0"
+files = [
+    {file = "isort-5.12.0-py3-none-any.whl", hash = "sha256:f84c2818376e66cf843d497486ea8fed8700b340f308f076c6fb1229dff318b6"},
+    {file = "isort-5.12.0.tar.gz", hash = "sha256:8bef7dde241278824a6d83f44a544709b065191b95b6e50894bdc722fcba0504"},
+]
 
 [package.extras]
-colors = ["colorama (>=0.4.3,<0.5.0)"]
-pipfile-deprecated-finder = ["pipreqs", "requirementslib"]
+colors = ["colorama (>=0.4.3)"]
+pipfile-deprecated-finder = ["pip-shims (>=0.5.2)", "pipreqs", "requirementslib"]
 plugins = ["setuptools"]
 requirements-deprecated-finder = ["pip-api", "pipreqs"]
 
-[[package]]
-name = "mccabe"
-version = "0.7.0"
-description = "McCabe checker, plugin for flake8"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
 [[package]]
 name = "mypy"
-version = "0.982"
+version = "1.4.1"
 description = "Optional static typing for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
+files = [
+    {file = "mypy-1.4.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:566e72b0cd6598503e48ea610e0052d1b8168e60a46e0bfd34b3acf2d57f96a8"},
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+    {file = "mypy-1.4.1-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:5703097c4936bbb9e9bce41478c8d08edd2865e177dc4c52be759f81ee4dd26c"},
+    {file = "mypy-1.4.1-cp39-cp39-win_amd64.whl", hash = "sha256:e02d700ec8d9b1859790c0475df4e4092c7bf3272a4fd2c9f33d87fac4427b8f"},
+    {file = "mypy-1.4.1-py3-none-any.whl", hash = "sha256:45d32cec14e7b97af848bddd97d85ea4f0db4d5a149ed9676caa4eb2f7402bb4"},
+    {file = "mypy-1.4.1.tar.gz", hash = "sha256:9bbcd9ab8ea1f2e1c8031c21445b511442cc45c89951e49bbf852cbb70755b1b"},
+]
 
 [package.dependencies]
-mypy-extensions = ">=0.4.3"
+mypy-extensions = ">=1.0.0"
 tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typing-extensions = ">=3.10"
+typing-extensions = ">=4.1.0"
 
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
+install-types = ["pip"]
 python2 = ["typed-ast (>=1.4.0,<2)"]
 reports = ["lxml"]
 
 [[package]]
 name = "mypy-extensions"
-version = "0.4.3"
-description = "Experimental type system extensions for programs checked with the mypy typechecker."
-category = "dev"
+version = "1.0.0"
+description = "Type system extensions for programs checked with the mypy type checker."
 optional = false
-python-versions = "*"
+python-versions = ">=3.5"
+files = [
+    {file = "mypy_extensions-1.0.0-py3-none-any.whl", hash = "sha256:4392f6c0eb8a5668a69e23d168ffa70f0be9ccfd32b5cc2d26a34ae5b844552d"},
+    {file = "mypy_extensions-1.0.0.tar.gz", hash = "sha256:75dbf8955dc00442a438fc4d0666508a9a97b6bd41aa2f0ffe9d2f2725af0782"},
+]
 
 [[package]]
 name = "packaging"
-version = "21.3"
+version = "23.1"
 description = "Core utilities for Python packages"
-category = "dev"
 optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
+python-versions = ">=3.7"
+files = [
+    {file = "packaging-23.1-py3-none-any.whl", hash = "sha256:994793af429502c4ea2ebf6bf664629d07c1a9fe974af92966e4b8d2df7edc61"},
+    {file = "packaging-23.1.tar.gz", hash = "sha256:a392980d2b6cffa644431898be54b0045151319d1e7ec34f0cfed48767dd334f"},
+]
 
 [[package]]
 name = "pathspec"
-version = "0.10.1"
+version = "0.11.1"
 description = "Utility library for gitignore style pattern matching of file paths."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
+files = [
+    {file = "pathspec-0.11.1-py3-none-any.whl", hash = "sha256:d8af70af76652554bd134c22b3e8a1cc46ed7d91edcdd721ef1a0c51a84a5293"},
+    {file = "pathspec-0.11.1.tar.gz", hash = "sha256:2798de800fa92780e33acca925945e9a19a133b715067cf165b8866c15a31687"},
+]
 
 [[package]]
 name = "platformdirs"
-version = "2.5.2"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "dev"
+version = "3.8.0"
+description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
 optional = false
 python-versions = ">=3.7"
+files = [
+    {file = "platformdirs-3.8.0-py3-none-any.whl", hash = "sha256:ca9ed98ce73076ba72e092b23d3c93ea6c4e186b3f1c3dad6edd98ff6ffcca2e"},
+    {file = "platformdirs-3.8.0.tar.gz", hash = "sha256:b0cabcb11063d21a0b261d557acb0a9d2126350e63b70cdf7db6347baea456dc"},
+]
 
 [package.extras]
-docs = ["furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx (>=4)", "sphinx-autodoc-typehints (>=1.12)"]
-test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
+docs = ["furo (>=2023.5.20)", "proselint (>=0.13)", "sphinx (>=7.0.1)", "sphinx-autodoc-typehints (>=1.23,!=1.23.4)"]
+test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=7.3.1)", "pytest-cov (>=4.1)", "pytest-mock (>=3.10)"]
 
 [[package]]
 name = "pluggy"
-version = "1.0.0"
+version = "1.2.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
+files = [
+    {file = "pluggy-1.2.0-py3-none-any.whl", hash = "sha256:c2fd55a7d7a3863cba1a013e4e2414658b1d07b6bc57b3919e0c63c9abb99849"},
+    {file = "pluggy-1.2.0.tar.gz", hash = "sha256:d12f0c4b579b15f5e054301bb226ee85eeeba08ffec228092f8defbaa3a4c4b3"},
+]
 
 [package.extras]
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
-name = "pycodestyle"
-version = "2.9.1"
-description = "Python style guide checker"
-category = "dev"
+name = "pycountry"
+version = "22.3.5"
+description = "ISO country, subdivision, language, currency and script definitions and their translations"
 optional = false
-python-versions = ">=3.6"
-
-[[package]]
-name = "pyflakes"
-version = "2.5.0"
-description = "passive checker of Python programs"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[[package]]
-name = "pyparsing"
-version = "3.0.9"
-description = "pyparsing module - Classes and methods to define and execute parsing grammars"
-category = "dev"
-optional = false
-python-versions = ">=3.6.8"
+python-versions = ">=3.6, <4"
+files = [
+    {file = "pycountry-22.3.5.tar.gz", hash = "sha256:b2163a246c585894d808f18783e19137cb70a0c18fb36748dc01fc6f109c1646"},
+]
 
-[package.extras]
-diagrams = ["jinja2", "railroad-diagrams"]
+[package.dependencies]
+setuptools = "*"
 
 [[package]]
 name = "pytest"
-version = "7.2.0"
+version = "7.4.0"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
+files = [
+    {file = "pytest-7.4.0-py3-none-any.whl", hash = "sha256:78bf16451a2eb8c7a2ea98e32dc119fd2aa758f1d5d66dbf0a59d69a3969df32"},
+    {file = "pytest-7.4.0.tar.gz", hash = "sha256:b4bf8c45bd59934ed84001ad51e11b4ee40d40a1229d2c79f9c592b0a3f6bd8a"},
+]
 
 [package.dependencies]
-attrs = ">=19.2.0"
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
 exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
 iniconfig = "*"
@@ -293,15 +318,18 @@ pluggy = ">=0.12,<2.0"
 tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
 
 [package.extras]
-testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
+testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
 
 [[package]]
 name = "pytest-cov"
-version = "4.0.0"
+version = "4.1.0"
 description = "Pytest plugin for measuring coverage."
-category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
+files = [
+    {file = "pytest-cov-4.1.0.tar.gz", hash = "sha256:3904b13dfbfec47f003b8e77fd5b589cd11904a21ddf1ab38a64f204d6a10ef6"},
+    {file = "pytest_cov-4.1.0-py3-none-any.whl", hash = "sha256:6ba70b9e97e69fcc3fb45bfeab2d0a138fb65c4d0d6a41ef33983ad114be8c3a"},
+]
 
 [package.dependencies]
 coverage = {version = ">=5.2.1", extras = ["toml"]}
@@ -314,303 +342,103 @@ testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtuale
 name = "python-dateutil"
 version = "2.8.2"
 description = "Extensions to the standard Python datetime module"
-category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
+files = [
+    {file = "python-dateutil-2.8.2.tar.gz", hash = "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86"},
+    {file = "python_dateutil-2.8.2-py2.py3-none-any.whl", hash = "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"},
+]
 
 [package.dependencies]
 six = ">=1.5"
 
 [[package]]
-name = "pytz"
-version = "2022.5"
-description = "World timezone definitions, modern and historical"
-category = "main"
+name = "ruff"
+version = "0.0.277"
+description = "An extremely fast Python linter, written in Rust."
 optional = false
-python-versions = "*"
-
-[[package]]
-name = "requests"
-version = "2.28.1"
-description = "Python HTTP for Humans."
-category = "dev"
+python-versions = ">=3.7"
+files = [
+    {file = "ruff-0.0.277-py3-none-macosx_10_7_x86_64.whl", hash = "sha256:3250b24333ef419b7a232080d9724ccc4d2da1dbbe4ce85c4caa2290d83200f8"},
+    {file = "ruff-0.0.277-py3-none-macosx_10_9_x86_64.macosx_11_0_arm64.macosx_10_9_universal2.whl", hash = "sha256:3e60605e07482183ba1c1b7237eca827bd6cbd3535fe8a4ede28cbe2a323cb97"},
+    {file = "ruff-0.0.277-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:7baa97c3d7186e5ed4d5d4f6834d759a27e56cf7d5874b98c507335f0ad5aadb"},
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+content-hash = "5b1417850edcddc5dff4fbb1711a5d0d1b4aa586482f203c2f68327e550ccb00"
diff --git a/pyproject.toml b/pyproject.toml
index 452a088..75024cb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "ccy"
-version = "1.3.0"
+version = "1.4.0"
 description = "Python currencies"
 authors = ["Luca Sbardella <luca@quantmind.com>"]
 license = "BSD"
@@ -10,22 +10,29 @@ packages = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.8,<3.12"
+python = "^3.10,<3.13"
 python-dateutil = "^2.8.2"
-pytz = "^2022.5"
+pycountry = "^22.3.5"
 
 [tool.poetry.group.dev.dependencies]
 black = "^22.10.0"
-flake8 = "^5.0.4"
 isort = "^5.10.1"
-coverage = "^6.5.0"
-codecov = "^2.1.12"
 pytest = "^7.2.0"
 pytest-cov = "^4.0.0"
-mypy = "^0.982"
-flake8-blind-except = "^0.2.1"
-flake8-commas = "^2.1.0"
+mypy = "^1.4.0"
+ruff = "^0.0.277"
+types-python-dateutil = "^2.8.19.13"
 
 [build-system]
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"
+
+
+[tool.mypy]
+disallow_untyped_calls = false
+disallow_untyped_defs = false
+warn_no_return = false
+
+[[tool.mypy.overrides]]
+module = "pycountry.*"
+ignore_missing_imports = true

From 7a93144ef0d81f36f26f2169f35d9f2c5c0b3dd4 Mon Sep 17 00:00:00 2001
From: Luca Sbardella <luca@quantmind.com>
Date: Thu, 20 Jul 2023 15:40:29 +0100
Subject: [PATCH 2/6] check py 3.12

---
 .github/workflows/build.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f12a24d..53e1de7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,7 +18,7 @@ jobs:
       PYPI_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v2

From 5d95bc48393ccfcc7c267bce1f3323096927ab7f Mon Sep 17 00:00:00 2001
From: Luca Sbardella <luca@quantmind.com>
Date: Thu, 20 Jul 2023 15:43:18 +0100
Subject: [PATCH 3/6] no 3.12

---
 .github/workflows/build.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 53e1de7..f12a24d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,7 +18,7 @@ jobs:
       PYPI_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v2

From 108d546f54bf36f1d72843863017318b04d5544e Mon Sep 17 00:00:00 2001
From: Luca Sbardella <luca@quantmind.com>
Date: Thu, 20 Jul 2023 15:43:38 +0100
Subject: [PATCH 4/6] no 3.12

---
 pyproject.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyproject.toml b/pyproject.toml
index 75024cb..4430c7f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ packages = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.10,<3.13"
+python = "^3.8,<3.13"
 python-dateutil = "^2.8.2"
 pycountry = "^22.3.5"
 

From 72cc2fc310f13160cf6976d334ae1cc008f4e3b3 Mon Sep 17 00:00:00 2001
From: Luca Sbardella <luca@quantmind.com>
Date: Thu, 20 Jul 2023 16:03:41 +0100
Subject: [PATCH 5/6] mypy

---
 ccy/__init__.py      | 16 +++++-----
 ccy/core/currency.py | 76 ++++++++++++++++++++------------------------
 tests/test_ccy.py    | 11 +++++++
 3 files changed, 53 insertions(+), 50 deletions(-)

diff --git a/ccy/__init__.py b/ccy/__init__.py
index 297b168..6a81da2 100644
--- a/ccy/__init__.py
+++ b/ccy/__init__.py
@@ -80,18 +80,18 @@ def crossover(code):
     return currency(code).as_cross("/")
 
 
-def all():
-    return currencydb().keys()
+def all() -> tuple[str, ...]:
+    return tuple(currencydb())
 
 
-def g7():
-    return ["EUR", "GBP", "USD", "CAD"]
+def g7() -> tuple[str, ...]:
+    return ("EUR", "GBP", "USD", "CAD")
 
 
-def g10():
-    return g7() + ["CHF", "SEK", "JPY"]
+def g10() -> tuple[str, ...]:
+    return g7() + ("CHF", "SEK", "JPY")
 
 
-def g10m():
+def g10m() -> tuple[str, ...]:
     """modified g10 = G10 + AUD, NZD, NOK"""
-    return g10() + ["AUD", "NZD", "NOK"]
+    return g10() + ("AUD", "NZD", "NOK")
diff --git a/ccy/core/currency.py b/ccy/core/currency.py
index 7324b91..84eee16 100644
--- a/ccy/core/currency.py
+++ b/ccy/core/currency.py
@@ -1,28 +1,30 @@
+from __future__ import annotations
+
 import sys
-from typing import NamedTuple
+from typing import Any, Callable, NamedTuple
 
 from .data import make_ccys
 
 usd_order = 5
 
 
-def to_string(v):
+def to_string(v: Any) -> str:
     if isinstance(v, bytes):
         return v.decode("utf-8")
     else:
         return "%s" % v
 
 
-def overusdfun(v1):
+def overusdfun(v1: float) -> float:
     return v1
 
 
-def overusdfuni(v1):
+def overusdfuni(v1: float) -> float:
     return 1.0 / v1
 
 
 class ccy(NamedTuple):
-    code: SyntaxError
+    code: str
     isonumber: str
     twoletterscode: str
     order: int
@@ -41,12 +43,12 @@ class ccy(NamedTuple):
     def symbol(self) -> str:
         return self.symbol_raw.encode("utf-8").decode("unicode_escape")
 
-    def __eq__(self, other):
+    def __eq__(self, other: Any) -> bool:
         if isinstance(other, ccy):
             return other.code == self.code
         return False
 
-    def description(self):
+    def description(self) -> str:
         if self.order > usd_order:
             v = "USD / %s" % self.code
         else:
@@ -56,32 +58,22 @@ def description(self):
         else:
             return "Dollar"
 
-    def info(self):
-        return {
-            "code": self.code,
-            "isonumber": self.isonumber,
-            "twoletterscode": self.twoletterscode,
-            "symbol": self.symbol,
-            "order": self.order,
-            "name": self.name,
-            "rounding": self.rounding,
-            "default_country": self.default_country,
-            "unicode symbol": self.symbol_raw,
-        }
-
-    def printinfo(self, stream=None):
+    def info(self) -> dict[str, Any]:
+        return self._asdict()
+
+    def printinfo(self, stream: Any | None = None) -> None:
         info = self.info()
         stream = stream or sys.stdout
         for k, v in info.items():
             stream.write(to_string("%s: %s\n" % (k, v)))
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return "%s: %s" % (self.__class__.__name__, self.code)
 
-    def __str__(self):
+    def __str__(self) -> str:
         return self.code
 
-    def swap(self, c2):
+    def swap(self, c2: ccy) -> tuple[bool, ccy, ccy]:
         """
         put the order of currencies as market standard
         """
@@ -94,19 +86,19 @@ def swap(self, c2):
             inv = True
         return inv, c1, c2
 
-    def overusdfunc(self):
+    def overusdfunc(self) -> Callable[[float], float]:
         if self.order > usd_order:
             return overusdfuni
         else:
             return overusdfun
 
-    def usdoverfunc(self):
+    def usdoverfunc(self) -> Callable[[float], float]:
         if self.order > usd_order:
             return overusdfun
         else:
             return overusdfuni
 
-    def as_cross(self, delimiter=""):
+    def as_cross(self, delimiter: str = "") -> str:
         """
         Return a cross rate representation with respect USD.
         @param delimiter: could be '' or '/' normally
@@ -116,7 +108,7 @@ def as_cross(self, delimiter=""):
         else:
             return "%s%sUSD" % (self.code, delimiter)
 
-    def spot(self, c2, v1, v2):
+    def spot(self, c2: ccy, v1: float, v2: float) -> float:
         if self.order > c2.order:
             vt = v1
             v1 = v2
@@ -137,22 +129,22 @@ class ccy_pair(NamedTuple):
     ccy2: ccy
 
     @property
-    def code(self):
+    def code(self) -> str:
         return "%s%s" % (self.ccy1, self.ccy2)
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return "%s: %s" % (self.__class__.__name__, self.code)
 
-    def __str__(self):
+    def __str__(self) -> str:
         return self.code
 
-    def mkt(self):
+    def mkt(self) -> ccy_pair:
         if self.ccy1.order > self.ccy2.order:
             return ccy_pair(self.ccy2, self.ccy1)
         else:
             return self
 
-    def over(self, name="usd"):
+    def over(self, name: str = "usd") -> ccy_pair:
         """Returns a new currency pair with the *over* currency as
         second part of the pair (Foreign currency)."""
         name = name.upper()
@@ -163,7 +155,7 @@ def over(self, name="usd"):
 
 
 class ccydb(dict[str, ccy]):
-    def insert(self, *args, **kwargs):
+    def insert(self, *args: Any, **kwargs: Any) -> None:
         c = ccy(*args, **kwargs)
         self[c.code] = c
 
@@ -176,24 +168,24 @@ def currencydb() -> ccydb:
     return _ccys
 
 
-def ccypairsdb():
+def ccypairsdb() -> dict[str, ccy_pair]:
     global _ccypairs
     if not _ccypairs:
         _ccypairs = make_ccypairs()
     return _ccypairs
 
 
-def currency(code):
+def currency(code: str | ccy) -> ccy:
     c = currencydb()
-    return c.get(str(code).upper())
+    return c[str(code).upper()]
 
 
-def ccypair(code):
+def ccypair(code: str | ccy_pair) -> ccy_pair:
     c = ccypairsdb()
-    return c.get(str(code).upper())
+    return c[str(code).upper()]
 
 
-def currency_pair(code):
+def currency_pair(code: str | ccy_pair) -> ccy_pair:
     """Construct a :class:`ccy_pair` from a six letter string."""
     c = str(code)
     c1 = currency(c[:3])
@@ -201,7 +193,7 @@ def currency_pair(code):
     return ccy_pair(c1, c2)
 
 
-def make_ccypairs():
+def make_ccypairs() -> dict[str, ccy_pair]:
     ccys = currencydb()
     db = {}
 
@@ -243,4 +235,4 @@ def dump_currency_table():
 
 
 _ccys: ccydb = ccydb()
-_ccypairs = None
+_ccypairs: dict[str, ccy_pair] = {}
diff --git a/tests/test_ccy.py b/tests/test_ccy.py
index f851e33..0ae77b6 100644
--- a/tests/test_ccy.py
+++ b/tests/test_ccy.py
@@ -3,6 +3,8 @@
 from io import StringIO as StreamIO
 
 import pytest
+
+import ccy as ccym
 from ccy import (
     CountryError,
     ccypair,
@@ -16,6 +18,15 @@
 from ccy.core.country import eurozone
 
 
+def test_codes():
+    ccys = ccym.all()
+    assert "USD" in ccys
+    assert len(ccym.g7()) == 4
+    assert len(ccym.g10()) == 7
+    assert len(set(ccym.g7())) == 4
+    assert len(set(ccym.g10())) == 7
+
+
 def test_defaultcountry():
     ccys = currencydb()
     for ccy in ccys.values():

From 739def94e3daa3b826b99cc44b435a669cb44299 Mon Sep 17 00:00:00 2001
From: Luca Sbardella <luca@quantmind.com>
Date: Thu, 20 Jul 2023 16:05:22 +0100
Subject: [PATCH 6/6] mypy

---
 .github/workflows/build.yml | 2 +-
 pyproject.toml              | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f12a24d..be73686 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,7 +18,7 @@ jobs:
       PYPI_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/pyproject.toml b/pyproject.toml
index 4430c7f..75024cb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ packages = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.8,<3.13"
+python = "^3.10,<3.13"
 python-dateutil = "^2.8.2"
 pycountry = "^22.3.5"