diff options
Diffstat (limited to 'Lib/typing.py')
| -rw-r--r-- | Lib/typing.py | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/Lib/typing.py b/Lib/typing.py index e492bd2..6f884e1 100644 --- a/Lib/typing.py +++ b/Lib/typing.py @@ -1379,8 +1379,7 @@ def _is_callable_members_only(cls): def _no_init(self, *args, **kwargs): - if type(self)._is_protocol: - raise TypeError('Protocols cannot be instantiated') + raise TypeError('Protocols cannot be instantiated') def _caller(depth=1, default='__main__'): try: @@ -1523,6 +1522,15 @@ class Protocol(Generic, metaclass=_ProtocolMeta): # We have nothing more to do for non-protocols... if not cls._is_protocol: + if cls.__init__ == _no_init: + for base in cls.__mro__: + init = base.__dict__.get('__init__', _no_init) + if init != _no_init: + cls.__init__ = init + break + else: + # should not happen + cls.__init__ = object.__init__ return # ... otherwise check consistency of bases, and prohibit instantiation. |