__init__.py 文件源码

def isint(obj):
    """
    Deprecated. Tests whether an object is a Py3 ``int`` or either a Py2 ``int`` or
    ``long``.

    Instead of using this function, you can use:

        >>> from future.builtins import int
        >>> isinstance(obj, int)

    The following idiom is equivalent:

        >>> from numbers import Integral
        >>> isinstance(obj, Integral)
    """

    return isinstance(obj, numbers.Integral)