26.md

rank	vote	view	answer	url
26	2686	3539652	16	url

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字典里添加元素的方法

当一个字典被创建了,能不能在字典里计入一个键?好像没有.add()的方法.

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>>> d = {'key':'value'}
>>> print d
{'key': 'value'}
>>> d['mynewkey'] = 'mynewvalue'
>>> print d
{'mynewkey': 'mynewvalue', 'key': 'value'}

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>>> x = {1:2}
>>> print x
{1: 2}

>>> x.update({3:4})
>>> print x
{1: 2, 3: 4}