fix

Dockerfile

@@ -2,7 +2,7 @@ FROM python:3.6
 
 WORKDIR /project
 
-RUN pip3 install -U pip>=20.2
+RUN pip3 install -U "pip>=20.2"
 COPY requirements.* ./
 RUN cat requirements.* > .requirements.txt
 RUN  pip3 install --use-feature=2020-resolver -r .requirements.txt

src/duckietown_world/geo/placed_object.py

@@ -65,7 +65,7 @@ def params_to_json_dict(self):
 
 @dataclass
 class PlacedObject(Serializable):
-    children: Dict[str, "PlacedObject"] = field(default_factory=dict)
+    children: "Dict[str, PlacedObject]" = field(default_factory=dict)
     spatial_relations: Dict[str, SpatialRelation] = field(default_factory=dict)
 
     def __post_init__(self):
@@ -98,6 +98,7 @@ def _simplecopy(self, *args, **kwargs):
         children = dict((k, v) for k, v in self.children.items())
         spatial_relations = dict((k, v) for k, v in self.spatial_relations.items())
         kwargs.update(dict(children=children, spatial_relations=spatial_relations))
+        # noinspection PyArgumentList
         return type(self)(*args, **kwargs)
 
     def _copy(self):

src/duckietown_world/seqs/tsequence.py

@@ -143,7 +143,11 @@ def __iter__(self):
     def from_iterator(cls, i: Iterator[X], T: Type[X] = object) -> "SampledSequence[X]":
         timestamps = []
         values = []
-        for t, v in i:
+        for x in i:
+            if len(x) != 2:
+                raise ZValueError(x=x)
+            t = x[0]
+            v = x[1]
             assert isinstance(t, (float, int)), type(t)
             t = Timestamp(t)
             timestamps.append(t)