New submission from Matias G <[email protected]>:
Hi Python developers,
I stumbled on a weird behavior, which might be a bug actually.
I am surprised by the output of the following piece of code:
```
import weakref
refs = []
class A:
def __init__(self):
refs.append(weakref.ref(self))
#raise RuntimeError() <<< enable this line of code and be surprised!
try:
A()
finally:
print(refs[0]())
```
The code prints None ; but, if the RuntimeError exception is raised
in the constructor, we find the object in the final print. It is not
dereferenced properly, as it seems:
```
<__main__.A object at 0x7f4b6cf23ed0>
Traceback (most recent call last):
File "/tmp/test.py", line 11, in <module>
A()
File "/tmp/test.py", line 8, in __init__
raise RuntimeError()
RuntimeError
```
I tried adding `gc.collect()` with no luck.
Am I doing something wrong ?
Thanks in advance
----------
components: Interpreter Core
messages: 404606
nosy: guijarro
priority: normal
severity: normal
status: open
title: Object stays alive for weak reference if an exception happens in
constructor
type: behavior
versions: Python 3.7
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue45555>
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