Home Backend Development Python Tutorial Python赋值语句后逗号的作用分析

Python赋值语句后逗号的作用分析

Jun 10, 2016 pm 03:10 PM
comma

本文实例讲述了Python赋值语句后逗号的作用。分享给大家供大家参考。具体分析如下:

IDLE 2.6.2

>>> a = 1
>>> b = 2,
>>> print type(a)
<type 'int'>
>>> print type(b)
<type 'tuple'>
>>> c = []
>>> d = [],
>>> print type(c)
<type 'list'>
>>> print type(d)
<type 'tuple'>
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赋值表达式的后面加了逗号后,会自动得到一个tuple的对象,在作一些与类型相关的工作或需要序列化时,是不能得到期望的结果的。工作中碰到类似灵异现象时,可以把这个放到自己的checklist中了。

>>> print c
[]
>>> print d
([],)
>>> print a
1
>>> print b
(2,)
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希望本文所述对大家的Python程序设计有所帮助。

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