list_tips_and_tricks.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n",
    "a[-1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n",
    "a[-4:2]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n",
    "a[::2]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "a = [1, 2, 3]\n",
    "b = ['a', 'b', 'c', 'd']\n",
    "z = zip(a, b)\n",
    "for k,v in z:\n",
    "    print(k, \":\", v)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import itertools\n",
    "a = [[1, 2], [3, 4], [5, 6]]\n",
    "list(itertools.chain.from_iterable(a))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import collections\n",
    "A = collections.Counter([1, 1, 2, 2, 3, 3, 3, 3, 4, 5, 6, 7])\n",
    "A.most_common(1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "m = dict()\n",
    "m['a']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "m = collections.defaultdict(int)\n",
    "m['a']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "for p in itertools.permutations([1, 2, 3, 4]):\n",
    "    print(''.join(str(x) for x in p))"
   ]
  }
 ],
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  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.6.3"
  }
 },
 "nbformat": 4,
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}