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# pandas.api.typing.Resampler.size

final Resampler.size()

  Compute group sizes.

  This method returns the number of rows in each resampled time period, including rows with missing values.

  Returns:
    Series

      Number of rows in each group.

  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

      >>> ser = pd.Series(
      ...     [1, 2, 3],
      ...     index=pd.DatetimeIndex(["2023-01-01", "2023-01-15", "2023-02-01"]),
      ... )
      >>> ser
      2023-01-01    1
      2023-01-15    2
      2023-02-01    3
      dtype: int64
      >>> ser.resample("MS").size()
      2023-01-01    2
      2023-02-01    1
      Freq: MS, dtype: int64