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# pandas.api.typing.SeriesGroupBy.sum

SeriesGroupBy.sum(numeric_only=False, min_count=0, skipna=True, engine=None, engine_kwargs=None)

  Compute sum of group values.

  Computes the sum for each group. Null values are excluded by default unless `skipna` is set to `False`.

  Parameters:
    numeric_only bool, default False

      Include only float, int, boolean columns.

      Changed in version 2.0.0: numeric_only no longer accepts `None`.

    min_count int, default 0

      The required number of valid values to perform the operation. If fewer than `min_count` non-NA values are present the result will be NA.

    skipna bool, default True

      Exclude NA/null values. If the entire group is NA and `skipna` is `True`, the result will be NA.

      Changed in version 3.0.0.

    engine str, default None None

      - `'cython'` : Runs rolling apply through C-extensions from cython.

      - `'numba'`Runs rolling apply through JIT compiled code from numba.

          Only available when `raw` is set to `True`.

      - `None` Defaults to `'cython'` or globally setting

          `compute.use_numba`

    engine_kwargs dict, default None None

      - For `'cython'` engine, there are no accepted `engine_kwargs`

      - For `'numba'` engine, the engine can accept `nogil`

          and `parallel` dictionary keys. The values must either be `True` or `False`. The default `engine_kwargs` for the `'numba'` engine is `{'nogil': False, 'parallel': False}` and will be applied to both the `func` and the `apply` groupby aggregation.

  Returns:
    Series or DataFrame

      Computed sum of values within each group.

  See also

  `Series.sum`

    Return the sum of the values over the requested axis.

  `DataFrame.sum`

    Return the sum of the values over the requested axis.

  Examples

  For SeriesGroupBy:

      >>> lst = ["a", "a", "b", "b"]
      >>> ser = pd.Series([1, 2, 3, 4], index=lst)
      >>> ser
      a    1
      a    2
      b    3
      b    4
      dtype: int64
      >>> ser.groupby(level=0).sum()
      a    3
      b    7
      dtype: int64

  For DataFrameGroupBy:

      >>> data = [[1, 8, 2], [1, 2, 5], [2, 5, 8], [2, 6, 9]]
      >>> df = pd.DataFrame(
      ...     data,
      ...     columns=["a", "b", "c"],
      ...     index=["tiger", "leopard", "cheetah", "lion"],
      ... )
      >>> df
                a  b  c
        tiger   1  8  2
      leopard   1  2  5
      cheetah   2  5  8
         lion   2  6  9
      >>> df.groupby("a").sum()
           b   c
      a
      1   10   7
      2   11  17