How to check every pandas series value is unique

You can use nunique

pd.Series([1, 2, 3]).nunique()==len(pd.Series([1, 2, 3]))
Out[62]: True

IIUC, pd.Series.is_unique

pd.Series([1, 2, 3]).is_unique
True

And

pd.Series([1, 2, 2]).is_unique
False

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