>>> d = {'1'：'one'，'3'：'three'，'2'：'two'，'5'：'five'，'4'：'four'} 
>&gt ;> d.values（）中的'one'
 True 
 

出于好奇，一些比较时间：

 >>> T（lambda：'d'itervalues（）中的一个）。repeat（）
 [0.28107285499572754，0.29107213020324707，0.27941107749938965] 
>>> T（λ：d.values（）中的one）。repeat（）
 [0.38303399085998535，0.37257885932922363，0.37096405029296875] 
>>> T（lambda：d.viewvalues（）中的one）。repeat（）
 [0.32004380226135254,031716084480285645,03171098232269287] 
 

编辑：如果你想知道为什么...原因是上述每个都返回一种不同类型的对象，这可能或可能不太适合查找操作：

 >>> type（d.viewvalues（））
< type'dict_values'> 
>>>类型（d.values（））
< type'list'> 
>>> type（d.itervalues（））
< type'dictionary-valueiterator'> 
 

EDIT2：根据评论中的请求...

 >>> T（λ：d.itervalues（）中的lambda为four）。repeat（）
 [0.41178202629089355,0.3959040641784668，0.3970959186553955] 
>>> T（λ：d.values（）中的four）。repeat（）
 [0.4631338119506836，0.43541407585144043，0.4359898567199707] 
>>> T（lambda：'d'view'（）中的'four'）。repeat（）
 [0.43414998054504395，0.4213531017303467，0.41684913635253906] 
 

I have the following dictionary in python:

d = {'1': 'one', '3': 'three', '2': 'two', '5': 'five', '4': 'four'}

I need a way to find if a value such as "one" or "two" exists in this dictionary.

For example, if I wanted to know if the index "1" existed I would simply have to type:

"1" in d

And then python would tell me if that is true or false, however I need to do that same exact thing except to find if a value exists.

>>> d = {'1': 'one', '3': 'three', '2': 'two', '5': 'five', '4': 'four'}
>>> 'one' in d.values()
True

Out of curiosity, some comparative timing:

>>> T(lambda : 'one' in d.itervalues()).repeat()
[0.28107285499572754, 0.29107213020324707, 0.27941107749938965]
>>> T(lambda : 'one' in d.values()).repeat()
[0.38303399085998535, 0.37257885932922363, 0.37096405029296875]
>>> T(lambda : 'one' in d.viewvalues()).repeat()
[0.32004380226135254, 0.31716084480285645, 0.3171098232269287]

EDIT: And in case you wonder why... the reason is that each of the above returns a different type of object, which may or may not be well suited for lookup operations:

>>> type(d.viewvalues())
<type 'dict_values'>
>>> type(d.values())
<type 'list'>
>>> type(d.itervalues())
<type 'dictionary-valueiterator'>

EDIT2: As per request in comments...

>>> T(lambda : 'four' in d.itervalues()).repeat()
[0.41178202629089355, 0.3959040641784668, 0.3970959186553955]
>>> T(lambda : 'four' in d.values()).repeat()
[0.4631338119506836, 0.43541407585144043, 0.4359898567199707]
>>> T(lambda : 'four' in d.viewvalues()).repeat()
[0.43414998054504395, 0.4213531017303467, 0.41684913635253906]