decorators.py 文件源码

def available_attrs(fn):
    """
    Return the list of functools-wrappable attributes on a callable.
    This is required as a workaround for http://bugs.python.org/issue3445
    under Python 2.
    """
    if six.PY3:
        return WRAPPER_ASSIGNMENTS
    else:
        return tuple(a for a in WRAPPER_ASSIGNMENTS if hasattr(fn, a))