Python 創建字典的多種方式

1.通過關鍵字dict和關鍵字參數創建
>>> dic = dict(spam = 1, egg = 2, bar =3)
>>> dic
{'bar': 3, 'egg': 2, 'spam': 1}

2.通過二元組列表創建
>>> list = [('spam', 1), ('egg', 2), ('bar', 3)]
>>> dic = dict(list)
>>> dic
{'bar': 3, 'egg': 2, 'spam': 1}

3.dict和zip結合創建
>>> dic = dict(zip('abc', [1, 2, 3]))
>>> dic
{'a': 1, 'c': 3, 'b': 2}

4.通過字典推導式創建
>>> dic = {i:2*i for i in range(3)}
>>> dic
{0: 0, 1: 2, 2: 4}

5.通過dict.fromkeys()創建
通常用來初始化字典, 設置value的默認值

>>> dic = dict.fromkeys(range(3), 'x')
>>> dic
{0: 'x', 1: 'x', 2: 'x'}

6.其他
>>> list = ['x', 1, 'y', 2, 'z', 3]
>>> dic = dict(zip(list[::2], list[1::2]))
>>> dic
{'y': 2, 'x': 1, 'z': 3}