def sub(x, y, context=None):
    """
    Return ``x`` - ``y``.

    """
    return _apply_function_in_current_context(
        BigFloat,
        mpfr.mpfr_sub,
        (
            BigFloat._implicit_convert(x),
            BigFloat._implicit_convert(y),
        ),
        context,
    )
def sub ( x , y , context = None ) : return _apply_function_in_current_context ( BigFloat , mpfr . mpfr_sub , ( BigFloat . _implicit_convert ( x ) , BigFloat . _implicit_convert ( y ) , ) , context , )
Return ``x`` - ``y``.