python.py 文件源码

def _get_xunit_setup_teardown(holder, attr_name, param_obj=None):
    """
    Return a callable to perform xunit-style setup or teardown if
    the function exists in the ``holder`` object.
    The ``param_obj`` parameter is the parameter which will be passed to the function
    when the callable is called without arguments, defaults to the ``holder`` object.
    Return ``None`` if a suitable callable is not found.
    """
    param_obj = param_obj if param_obj is not None else holder
    result = _get_xunit_func(holder, attr_name)
    if result is not None:
        arg_count = result.__code__.co_argcount
        if inspect.ismethod(result):
            arg_count -= 1
        if arg_count:
            return lambda: result(param_obj)
        else:
            return result