to the same type. Alternatively, use a
            mapping, e.g. {col: dtype, ...}, where col is a column label and dtype is
            a numpy.dtype or Python type to cast one or more of the DataFrame's
            columns to column-specific types.
        copy : bool, default True
            Return a copy when ``copy=True`` (be very careful setting
            ``copy=False`` as changes to values then may propagate to other
            pandas objects).
        errors : {'raise', 'ignore'}, default 'raise'
            Control raising of exceptions on invalid data for provided dtype.

            - ``raise`` : allow exceptions to be raised
            - ``ignore`` : suppress exceptions. On error return original object.

        Returns
        -------
        same type as caller

        See Also
        --------
        to_datetime : Convert argument to datetime.
        to_timedelta : Convert argument to timedelta.
        to_numeric : Convert argument to a numeric type.
        numpy.ndarray.astype : Cast a numpy array to a specified type.

        Notes
        -----
        .. versionchanged:: 2.0.0

            Using ``astype`` to convert from timezone-naive dtype to
            timezone-aware dtype will raise an exception.
            Use :meth:`Series.dt.tz_localize` instead.

        Examples
        --------
        Create a DataFrame:

        >>> d = {'col1': [1, 2], 'col2': [3, 4]}
        >>> df = pd.DataFrame(data=d)
        >>> df.dtypes
        col1    int64
        col2    int64
        dtype: object

        Cast all columns to int32:

        >>> df.astype('int32').dtypes
        col1    int32
        col2    int32
        dtype: object

        Cast col1 to int32 using a dictionary:

        >>> df.astype({'col1': 'int32'}).dtypes
        col1    int32
        col2    int64
        dtype: object

        Create a series:

        >>> ser = pd.Series([1, 2], dtype='int32')
        >>> ser
        0    1
        1    2
        dtype: int32
        >>> ser.astype('int64')
        0    1
        1    2
        dtype: int64

        Convert to categorical type:

        >>> ser.astype('category')
        0    1
        1    2
        dtype: category
        Categories (2, int32): [1, 2]

        Convert to ordered categorical type with custom ordering:

        >>> from pandas.api.types import CategoricalDtype
        >>> cat_dtype = CategoricalDtype(
        ...     categories=[2, 1], ordered=True)
        >>> ser.astype(cat_dtype)
        0    1
        1    2
        dtype: category
        Categories (2, int64): [2 < 1]

        Create a series of dates:

        >>> ser_date = pd.Series(pd.date_range('20200101', periods=3))
        >>> ser_date
        0   2020-01-01
        1   2020-01-02
        2   2020-01-03
        dtype: datetime64[ns]
        Fr