# 列表推导式 # 产生1~10之间的偶数list => [2, 4, 6, 8, 10] # ls = [] # for i in range(1, 11): #     if i % 2 == 0: #         ls.append(i) # print(ls) # 语法：[结果 for 结果 in 可for循环操作的对象] # 案例：[v for v in 'abc'] => ['a', 'b', 'c'] ls = [i for i in range(1, 11)]  # => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] print(ls) # ls = ['' if i % 2 != 0 else i for i in range(1, 11)] ls = [i for i in range(2, 11, 2)]  # => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] print(ls) # 1~5之间的数用奇数偶数形参list => ['奇数', '偶数', '奇数', '偶数','奇数'] ls = ['奇数' if i % 2 != 0 else '偶数' for i in range(1, 6)] print(ls) # ls = ('奇数' if i % 2 != 0 else '偶数' for i in range(1, 6)) # print(tuple(ls)) # 字典推导式 # 语法：{k: v for k, v in 可for循环操作的对象(每一次循环的结果可以被解压为两个值)} # 原数据: [('a', 1), ('b', 2)] => {'a': 1, 'b': 2} source = [('a', 1), ('b', 2)] # dic = {} # for k, v in source: #     dic[k] = v # print(dic) dic = {k: v for k, v in source} print(dic) dic = {i: 0 for i in 'abc'} print(dic) print({}.fromkeys('abc', 0))