搜索Python字典，其中值是列表 [英] Search Python dictionary where value is list

问题描述

如果我有一个字典，默认情况下该值设置为列表，那么我可以如何在字典中搜索所有这些列表？

If I had a dictionary where the value was set to a list by default, how could I go about searching all of these lists in the dictionary for a certain term?

例如：

textbooks = {"math":("red", "large"), "history":("brown", "old", "small")} 

同样的事情可能再次发生，我怎么会说找到所有的键值，其中的值是包含红色的列表？在我上面的例子中，我想要找到的只是数学。

With more terms and cases where the same thing might occur again, how could I say find all of the keys in which their value is a list containing "red"? In my example above, the only one I'd want it to find would be "math".

推荐答案

[k for k, v in textbooks.iteritems() if 'red' in v]

res = []
for key, val in textbooks.iteritems():
    if 'red' in val:
        res.append(key)

请参阅清单 Python文档中的理解

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