python从字典中删除那些具有相同值的键答案

【问题标题】：python delete those keys from dictionary who has same valuepython从字典中删除那些具有相同值的键
【发布时间】：2013-06-28 15:17:27
【问题描述】：

嘿，我有像下面这样的字典

dicts = {
'met_293':['81.0175','4','7','7','29.76','23','1','0','22','28.57','2','[KG]EHY' ],
'met_394':['79.9579','4','7','7','29.76','18','3','0','15','28.57','2','EHY[ILV]'],
'met_309':['81.0175','4','7','7','29.76','23','1','0','22','28.57','2','[KG]EHY' ],
'met_387':['79.9579','4','7','7','29.76','18','3','0','15','28.57','2','EHY[ILV]']
}

我想删除具有相同值的键，例如“met_293”和“met_309”，这两个键在第 12 位具有相同的值，即“[KG]EHY”，所以我想要这样的字典

{
'met_293':['81.0175','4','7','7','29.76','23','1','0','22','28.57','2','[KG]EHY'],
'met_394':['79.9579','4','7','7','29.76','18','3','0','15','28.57','2','EHY[ILV]']
}

任何帮助！谢谢

【问题讨论】：

如果您告诉我们您已经尝试过什么，您将更有可能得到答案。
你的意思是删除一个键对吗？

标签： python python-2.7

【解决方案1】：

您可以使用set 和字典理解：

>>> dicts = {'met_293': ['81.0175','4','7','7','29.76','23','1','0','22','28.57','2','[KG]EHY'],'met_394': ['79.9579','4','7','7','29.76','18','3','0','15','28.57','2','EHY[ILV]'],'met_309': ['81.0175','4','7','7','29.76','23','1','0','22','28.57','2','[KG]EHY'],'met_387': ['79.9579','4','7','7','29.76','18','3','0','15','28.57','2','EHY[ILV]']}
>>> seen = set()
>>> {k:v for k,v in dicts.iteritems() 
                                 if v[11] not in seen and not seen.add(v[11])}
{'met_394': ['79.9579', '4', '7', '7', '29.76', '18', '3', '0', '15', '28.57', '2', 'EHY[ILV]'],
 'met_293': ['81.0175', '4', '7', '7', '29.76', '23', '1', '0', '22', '28.57', '2', '[KG]EHY']}

上面的代码等价于：

>>> dic = {}
>>> seen = set()
>>> for k,v in dicts.iteritems():
...     if v[11] not in seen:
...         dic[k] = v
...         seen.add(v[11])
...         
>>> dic
{'met_394': ['79.9579', '4', '7', '7', '29.76', '18', '3', '0', '15', '28.57', '2', 'EHY[ILV]'],
 'met_293': ['81.0175', '4', '7', '7', '29.76', '23', '1', '0', '22', '28.57', '2', '[KG]EHY']}

【讨论】：