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# pandas.core.groupby.SeriesGroupBy.cummin

SeriesGroupBy.cummin(axis=<no_default>, numeric_only=False, **kwargs)

  Cumulative min for each group.

  Returns:
    Series or DataFrame

  See also

  `Series.groupby`

    Apply a function groupby to a Series.

  `DataFrame.groupby`

    Apply a function groupby to each row or column of a DataFrame.

  Examples

  For SeriesGroupBy:

      >>> lst = ['a', 'a', 'a', 'b', 'b', 'b']
      >>> ser = pd.Series([1, 6, 2, 3, 0, 4], index=lst)
      >>> ser
      a    1
      a    6
      a    2
      b    3
      b    0
      b    4
      dtype: int64
      >>> ser.groupby(level=0).cummin()
      a    1
      a    1
      a    1
      b    3
      b    0
      b    0
      dtype: int64

  For DataFrameGroupBy:

      >>> data = [[1, 0, 2], [1, 1, 5], [6, 6, 9]]
      >>> df = pd.DataFrame(data, columns=["a", "b", "c"],
      ...                   index=["snake", "rabbit", "turtle"])
      >>> df
              a   b   c
      snake   1   0   2
      rabbit  1   1   5
      turtle  6   6   9
      >>> df.groupby("a").groups
      {1: ['snake', 'rabbit'], 6: ['turtle']}
      >>> df.groupby("a").cummin()
              b   c
      snake   0   2
      rabbit  0   2
      turtle  6   9