[Python] How to denote return type of a @classmethod ctor in python?

#!/usr/bin/env python

# In this file: a problem with de-serializing an object.

import pickle

class User:
@classmethod
def from_bytes(cls, b: bytes) -> User:
obj = pickle.loads(b)
assert type(obj) == cls, (type(obj), cls)
return obj


fails with

Traceback (most recent call last):
File "/tmp/./lqlq.py", line 7, in <module>
class User:
...<4 lines>...
return obj
File "/tmp/./lqlq.py", line 9, in User
def from_bytes(cls, b: bytes) -> User:
^^^^
NameError: name 'User' is not defined


In C you do a forward declaration. What's the alternative in python?

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