字典创建方式
1.創建空字典
| 1 2 3 | >>> dic = {} >>> type(dic) <type 'dict'> |
2.直接賦值創建
| 1 2 3 | >>> dic = {'spam':1, 'egg':2, 'bar':3} >>> dic {'bar': 3, 'egg': 2, 'spam': 1} |
3.通過關鍵字dict和關鍵字參數創建
| 1 2 3 | >>> dic = dict(spam = 1, egg = 2, bar =3) >>> dic {'bar': 3, 'egg': 2, 'spam': 1} |
4.通過二元組列表創建
| 1 2 3 4 | >>> list = [('spam', 1), ('egg', 2), ('bar', 3)] >>> dic = dict(list) >>> dic {'bar': 3, 'egg': 2, 'spam': 1} |
5.dict和zip結合創建
| 1 2 3 | >>> dic = dict(zip('abc', [1, 2, 3])) >>> dic {'a': 1, 'c': 3, 'b': 2} |
6.通過字典推導式創建
| 1 2 3 | >>> dic = {i:2*i for i in range(3)} >>> dic {0: 0, 1: 2, 2: 4} |
7.通過dict.fromkeys()創建
通常用來初始化字典, 設置value的默認值
| 1 2 3 | >>> dic = dict.fromkeys(range(3), 'x') >>> dic {0: 'x', 1: 'x', 2: 'x'} |
8.其他
| 1 2 3 4 | >>> list = ['x', 1, 'y', 2, 'z', 3] >>> dic = dict(zip(list[::2], list[1::2])) >>> dic {'y': 2, 'x': 1, 'z': 3} |
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轉載：
Python創建字典的八種方式_python_腳本之家 (jb51.net)
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