[New-bugs-announce] [issue25472] Typing: Specialized subclasses of generics cannot be unpickled
Matt Chaput
report at bugs.python.org
Sat Oct 24 23:09:33 EDT 2015
New submission from Matt Chaput:
If I try to pickle and unpickle an object of a class that has specialized a generic superclass, when I try to unpickle I get this error:
TypeError: descriptor '__dict__' for 'A' objects doesn't apply to 'B' object
Test case:
from typing import Generic, TypeVar
import pickle
T = TypeVar("T")
class A(Generic[T]):
def __init__(self, x: T):
self.x = x
class B(A[str]):
def __init__(self, x: str):
self.x = x
b = B("hello")
z = pickle.dumps(b)
print(z)
_ = pickle.loads(z)
----------
messages: 253421
nosy: maatt
priority: normal
severity: normal
status: open
title: Typing: Specialized subclasses of generics cannot be unpickled
versions: Python 3.5
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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25472>
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