031.Test_TimeCal_2.ipynb

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    "# 优雅使用Python\n",
    "\n",
    "# 1\n",
    "# a = 1\n",
    "# b = 2\n",
    "# print(a, b)\n",
    "# a, b = b, a\n",
    "# print(a, b)\n",
    "\n",
    "# 2 生成器\n",
    "# for i in range(0, 10000000000):\n",
    "#     if i == 9999999:\n",
    "#         print(i)\n",
    "\n",
    "# 3\n",
    "# a = ['A', 'B', 'C', 'D']\n",
    "\n",
    "# for i in a:\n",
    "#     print(a.index(i), i)\n",
    "#\n",
    "# for i, j in enumerate(a):\n",
    "#     print(i, j)\n",
    "\n",
    "# 4\n",
    "# a = ['A', 'B', 'C', 'D']\n",
    "# print(''.join(a))\n",
    "# # print('1001'.center(8, '2'))\n",
    "# print('|'.join(a))\n",
    "\n",
    "# 5\n",
    "# with open('1.txt', 'r') as f:\n",
    "#     f.readlines()\n",
    "\n",
    "# 6\n",
    "# result = []\n",
    "# for i in range(0, 10):\n",
    "#     s = i ** 2\n",
    "#     result.append(s)\n",
    "# print(result)\n",
    "#\n",
    "# # pythonic\n",
    "# a = [i ** 2 for i in range(0, 10)]\n",
    "# print(a)\n",
    "\n",
    "# 7\n",
    "\n",
    "# 8\n",
    "# a = ['A', 'B', 'C', 'D']\n",
    "# print(a)\n",
    "#\n",
    "# a1 = a.copy()\n",
    "# a1.pop(0)\n",
    "# a1.insert(0, '0A')\n",
    "# print(a1)\n",
    "#\n",
    "# a2 = a.copy()\n",
    "# a2[0] = '0A'\n",
    "# print(a2)\n",
    "#\n",
    "# from collections import deque\n",
    "# a3 = deque(a)\n",
    "# print(a3)\n",
    "# a3.popleft()\n",
    "# print(a3)\n",
    "# a3.appendleft('0A')\n",
    "# print(a3)\n",
    "# a3.pop()\n",
    "# print(a3)\n",
    "\n",
    "# 9\n",
    "# p = 'A', 'B', 'C', 'D'\n",
    "# a1, a2, a3, a4 = p\n",
    "# print(a1, a2, a3, a4)\n",
    "\n",
    "# # 10\n",
    "# a = {}\n",
    "# for i in range(0, 10000):\n",
    "#     a.update({i: str(i)})\n",
    "# print(a)\n",
    "#\n",
    "# for i in a:\n",
    "#     print(i, a[i])\n",
    "#\n",
    "# for i, j in a.items():\n",
    "#     print(i, j)\n",
    "\n",
    "# 11\n",
    "# a = 15\n",
    "# if 18 > a > 10:\n",
    "#     print(1)\n",
    "\n",
    "# 12\n",
    "# a = 15\n",
    "# b = ''\n",
    "# if a == 15:\n",
    "#     b = '1'\n",
    "# else:\n",
    "#     b = '0'\n",
    "# print(b)\n",
    "#\n",
    "# # b = ''\n",
    "# b = '1' if a == 15 else '0'\n",
    "# print(b)\n",
    "\n",
    "# 13\n",
    "# for i in range(0, 12):\n",
    "#     print(i)\n",
    "# else:\n",
    "#     print('end!')\n",
    "#\n",
    "# for i in range(0, 12):\n",
    "#     print(i)\n",
    "#     if i == 2:\n",
    "#         break\n",
    "# else:\n",
    "#     print('end!')\n",
    "\n",
    "# 14\n",
    "# a = 'HI'\n",
    "# b = 'GOOD MORNING'\n",
    "# print('%s ivan,%s!' % (a, b))\n",
    "# print('{s1} ivan,{s2}!'.format(s1=a, s2=b))\n",
    "\n",
    "# 15\n",
    "# a = [1, 2, 3, 4, 5, 6, 7]\n",
    "# print(a)\n",
    "# print(a[1:])\n",
    "# print(a[1::2])\n",
    "\n",
    "# 16\n",
    "#\n",
    "#\n",
    "# def fib1(n):\n",
    "#     a, b = 0, 1\n",
    "#     result = []\n",
    "#     while b < n:\n",
    "#         result.append(b)\n",
    "#         a, b = b, a+b\n",
    "#     return result\n",
    "#\n",
    "# print(fib1(10))\n",
    "#\n",
    "#\n",
    "# def fib2(n):\n",
    "#     a, b = 0, 1\n",
    "#     while b < n:\n",
    "#         yield b\n",
    "#         a, b = b, a+b\n",
    "# for i in fib2(10):\n",
    "#     print(i)\n",
    "#\n",
    "# # def f1():\n",
    "# #     for i in range(0, 5):\n",
    "# #         yield i\n",
    "# #\n",
    "# # for i in f1():\n",
    "# #     print(i)\n",
    "\n",
    "# 17\n",
    "# a = {'0': '0A', '1': '1B'}\n",
    "# b1 = '0'\n",
    "# b2 = '0 '\n",
    "# c = 'NONE'\n",
    "#\n",
    "# if b1 in a:\n",
    "#     print(a[b1])\n",
    "# else:\n",
    "#     print(c)\n",
    "#\n",
    "# print(a.get(b1, c))\n",
    "#\n",
    "# if b2 in a:\n",
    "#     print(a[b2])\n",
    "# else:\n",
    "#     print(c)\n",
    "#\n",
    "# print(a.get(b2, c))\n",
    "\n",
    "# 18\n",
    "# a = [('a', 1), ('b', 2), ('a', 3), ('b', 4)]\n",
    "# b = {}\n",
    "# for (i, j) in a:\n",
    "#     print(i, j)\n",
    "#     if i in b:\n",
    "#         b[i].append(j)\n",
    "#     else:\n",
    "#         b[i] = [j]\n",
    "# print(b)\n",
    "#\n",
    "# c = {}\n",
    "# for (i, j) in a:\n",
    "#     c.setdefault(i, []).append(j)\n",
    "# print(c)\n",
    "#\n",
    "# from collections import defaultdict\n",
    "# d = defaultdict(list)\n",
    "# print(d)\n",
    "# for (i, j) in a:\n",
    "#     d[i].append(j)\n",
    "# print(d)\n",
    "\n",
    "# 19\n",
    "# a = [1, 2, 3]\n",
    "#\n",
    "# b = {i: i**2 for i in a}\n",
    "# print(b)\n",
    "#\n",
    "# c = {i: i**2 for i in a if i > 1}\n",
    "# print(c)\n",
    "#\n",
    "# # low\n",
    "# # e = {}\n",
    "# # for i in a:\n",
    "# #     if i > 1:\n",
    "# #         e.update({i: i**2})\n",
    "# # print(e)\n",
    "#\n",
    "# f = {i: i**2 for i in a if i > 1}\n",
    "# print(f)\n",
    "# f1 = [i for i in a if i > 1]\n",
    "# print(f1)\n"
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