python通过字典dict判断指定键值是否存在的方法

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Release: 2016-06-10 15:17:02
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本文实例讲述了python通过字典dict判断指定键值是否存在的方法。分享给大家供大家参考。具体如下:

python中有两种方法可以判断指定的键值是否存在,一种是通过字典对象的方法 has_key 判断,另外一种是通过 in 方法,下面是详细的范例。

d={'site':'http://www.jb51.net','name':'jb51','is_good':'yes'}
#方法1:通过has_key
print d.has_key('site')
#方法2:通过in
print 'body' in d.keys()
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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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