Find a common data type among the given dtypes.

    Parameters
    ----------
    types : list of dtypes

    Returns
    -------
    pandas extension or numpy dtype

    See Also
    --------
    numpy.find_common_type

def find_common_type(types):
    """
    Find a common data type among the given dtypes.

    Parameters
    ----------
    types : list of dtypes

    Returns
    -------
    pandas extension or numpy dtype

    See Also
    --------
    numpy.find_common_type

    """

    if len(types) == 0:
        raise ValueError('no types given')

    first = types[0]

    # workaround for find_common_type([np.dtype('datetime64[ns]')] * 2)
    # => object
    if all(is_dtype_equal(first, t) for t in types[1:]):
        return first

    if any(isinstance(t, (PandasExtensionDtype, ExtensionDtype))
           for t in types):
        return np.object

    # take lowest unit
    if all(is_datetime64_dtype(t) for t in types):
        return np.dtype('datetime64[ns]')
    if all(is_timedelta64_dtype(t) for t in types):
        return np.dtype('timedelta64[ns]')

    # don't mix bool / int or float or complex
    # this is different from numpy, which casts bool with float/int as int
    has_bools = any(is_bool_dtype(t) for t in types)
    if has_bools:
        for t in types:
            if is_integer_dtype(t) or is_float_dtype(t) or is_complex_dtype(t):
                return np.object

    return np.find_common_type(types, [])