python创建字典的几种方法

python创建字典的几种方法

1. 创建空字典

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

另一种形式:

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temp = dict()
temp['name'] = 'xiaoming'

2. 直接赋值创建

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

3. 通过关键字dict和关键字参数创建

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

4. 通过二元组列表创建

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

5. dict和zip结合创建

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

6. 通过字典推导式创建

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

7. 通过dict.fromkeys()创建

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

8. 其他

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>>> 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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