dict - Python determines whether there are duplicate values in a dictionary

Question

The input is a dictionary, for example: {'A': 1, 'B': 1, 'C': 3}. How to determine whether there are duplicate values ​​in the dictionary?

扔个三星炸死你 · Answer

Reference article: Python’s list, dict, json and other common operations

Check whether there are duplicate values in the dictionary

>>> def has_duplicates(d):
        return len(d) != len(set(d.values()))
>>> print has_duplicates({'A': 1, 'B': 1, 'C': 3})
True
>>>

阿神 · Answer

d = {'A': 1, 'B': 1, 'C': 3}

#不相等即有重复值
print len(d.values()) == len(set(d.values()))

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