base.py 文件源码

def __get_ie(ie):
    if ie is None:
        imp = exp = lambda val: val
    elif ie is NotImplemented:
        imp = exp = lambda val: NotImplemented
    elif isinstance(ie, basestring):
        imp, exp = _object_proxy(ie), lambda val: val.id
    elif isinstance(ie, types.ModuleType):
        imp, exp = ie.loads, ie.dumps
    elif isinstance(ie, type) and issubclass(ie, BaseObject):
        imp, exp = ie, lambda val: val.id
    elif isinstance(ie, type) and issubclass(ie, Enum):
        imp, exp = ie, lambda val: val.value
    elif callable(ie):
        imp = exp = ie

    return imp, exp