df.duplicated().sum()Try It
import pandas as pd
df = pd.DataFrame([[1, 2], [1, 2], [5,6], [9,0], [9,0]], columns=['A', 'B'])
df.duplicated()>>>
0 False
1 True
2 False
3 False
4 True
dtype: bool
1 True
2 False
3 False
4 True
dtype: bool
df.duplicated().sum()
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