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unique in numpy & pandas

2022-08-02 12:07:00 【The big cat who wants to lie down every day】

np.unique()

np.unique(ar,return_index=False,return_inverse=False,return_counts=False,axis=None,)
  • np.nan is included in np.unique()
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Series.unique()

  • Series.unique() contains missing values
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Series.nunique(), DataFrame.nunique()

  • Series.nunique(), DataFrame.nunique() do not contain missing values ​​by default, you can choose whether to include missing values ​​through the parameter dropna
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