[英]How to count duplicates in Pandas?
I use this pattern to find duplicates in column A from set duplicates
:我使用此模式从 set
duplicates
中查找列 A 中的重复项:
duplicates = {1, 2, 3}
df[~df['A'].isin(duplicates)]
It works and returns me rows witout duplicates.它可以工作并返回没有重复的行。 But how to get count of duplicates?
但是如何获得重复数?
I have tried these:我试过这些:
df[~df['A'].isin(duplicates)].count()
~df['A'].isin(duplicates).count()
And how to extract this count to variable.以及如何将此计数提取到变量中。
new_df = df[~df['A'].isin(duplicates)]
new_df['duplicate_values'] = new_df.duplicated('A')
new_df['duplicate_values'].sum()
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