New submission from jeffersonqin <1247006...@qq.com>:
For the following code piece:
```
import pickle
class Child:
def __init__(self, field):
self.field = field
class Parent:
child = Child(0.5)
if __name__ == '__main__':
i = input()
if i == 'd':
parent = Parent()
parent.child.field = 0.6
pickle.dump(parent, open('test.pkl', 'wb+'))
else:
parent = pickle.load(open('test.pkl', 'rb'))
print(parent.child.field)
```
After dumping, when we load the file throught `pickles.load`,
`parent.child.field` is 0.5, and is not 0.6, which we intend it to be.
However, after removing the line `child = Child(0.5)` and moving it to
`__init__(self)` of `Parent`, everything works fine.
I'm not sure whether this is indeed an issue. If not, sorry for take your time.
----------
components: Library (Lib)
files: test.py
messages: 415341
nosy: jeffersonqin
priority: normal
severity: normal
status: open
title: pickle not working correctly when custom field is directly initialized
by constructors
type: behavior
versions: Python 3.9
Added file: https://bugs.python.org/file50682/test.py
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue47034>
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