:`DataFrame`
        (still experimental). Behaviour is as follows:

        * ``"numpy_nullable"``: returns nullable-dtype-backed :class:`DataFrame`
          (default).
        * ``"pyarrow"``: returns pyarrow-backed nullable :class:`ArrowDtype`
          DataFrame.

        .. versionadded:: 2.0

    Returns
    -------
    ret
        Numeric if parsing succeeded.
        Return type depends on input.  Series if Series, otherwise ndarray.

    See Also
    --------
    DataFrame.astype : Cast argument to a specified dtype.
    to_datetime : Convert argument to datetime.
    to_timedelta : Convert argument to timedelta.
    numpy.ndarray.astype : Cast a numpy array to a specified type.
    DataFrame.convert_dtypes : Convert dtypes.

    Examples
    --------
    Take separate series and convert to numeric, coercing when told to

    >>> s = pd.Series(['1.0', '2', -3])
    >>> pd.to_numeric(s)
    0    1.0
    1    2.0
    2   -3.0
    dtype: float64
    >>> pd.to_numeric(s, downcast='float')
    0    1.0
    1    2.0
    2   -3.0
    dtype: float32
    >>> pd.to_numeric(s, downcast='signed')
    0    1
    1    2
    2   -3
    dtype: int8
    >>> s = pd.Series(['apple', '1.0', '2', -3])
    >>> pd.to_numeric(s, errors='ignore')
    0    apple
    1      1.0
    2        2
    3       -3
    dtype: object
    >>> pd.to_numeric(s, errors='coerce')
    0    NaN
    1    1.0
    2    2.0
    3   -3.0
    dtype: float64

    Downcasting of nullable integer and floating dtypes is supported:

    >>> s = pd.Series([1, 2, 3], dtype="Int64")
    >>> pd.to_numeric(s, downcast="integer")
    0    1
    1    2
    2    3
    dtype: Int8
    >>> s = pd.Series([1.0, 2.1, 3.0], dtype="Float64")
    >>> pd.to_numeric(s, downcast="float")
    0    1.0
    1    2.1
    2    3.0
    dtype: Float32
    )