Python创建dict的几种方法

>>> dic = {}
>>> type(dic)
<type ‘dict‘>

>>> dic = {‘spam‘:1, ‘egg‘:2, ‘bar‘:3}
>>> dic
{‘bar‘: 3, ‘egg‘: 2, ‘spam‘: 1}

>>> dic = dict(spam = 1, egg = 2, bar =3)
>>> dic
{‘bar‘: 3, ‘egg‘: 2, ‘spam‘: 1}

>>> list = [(‘spam‘, 1), (‘egg‘, 2), (‘bar‘, 3)]
>>> dic = dict(list)
>>> dic
{‘bar‘: 3, ‘egg‘: 2, ‘spam‘: 1}

>>> dic = dict(zip(‘abc‘, [1, 2, 3]))
>>> dic
{‘a‘: 1, ‘c‘: 3, ‘b‘: 2}

>>> dic = {i:2*i for i in range(3)}
>>> dic
{0: 0, 1: 2, 2: 4}

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

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