New submission from aklajnert <pyt...@aklajnert.pl>:
I'm not 100% sure whether it is a bug or intentional behavior but looks like a
bug to me. I couldn't find anything about it here or anywhere else.
Sample project structure:
```
.
├── main.py
└── src
├── __init__.py
├── common_object.py
├── user_1.py
├── user_2.py
└── user_3.py
```
`__init__.py` is an empty file.
```
# src/common_object.py
OBJECT = object()
```
```
# src/user_1.py
from .common_object import OBJECT
```
```
# src/user_2.py
from src.common_object import OBJECT
```
```
# src/user_3.py
from common_object import OBJECT
```
```
# main.py
import sys
sys.path.append("src")
from src import user_1, user_2, user_3
if __name__ == '__main__':
print(user_1.OBJECT is user_2.OBJECT) # True
print(user_1.OBJECT is user_3.OBJECT) # False
```
Since `src` package is added to `PYTHONPATH`, it is possible to import
`common_object` by calling `from src.common_object` or `from common_object`.
Both methods work, but using import without `src.` makes Python load the same
module again instead of using the already loaded one.
If you extend `main.py` with the following code, you'll see a bit more:
```
modules = [
module
for name, module in sys.modules.items()
if "common_object" in name
]
print(len(modules)) # 2
print(modules[0].__file__ == modules[1].__file__) # True
```
In the `sys.modules` dict there will be two separate modules - one called
`common_object` and another named `src.common_object`.
If you compare the `__file__` value for both modules you'll see that they are
the same. It seems that python gets the module name wrong.
----------
messages: 413584
nosy: aklajnert
priority: normal
severity: normal
status: open
title: Overlapping PYTHONPATH may cause
type: behavior
versions: Python 3.10, Python 3.7, Python 3.8, Python 3.9
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46806>
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