No Attribute Error for modules

[nameer]

To help you understand the issue:

• I'm Reporting a bug
• So far I have mypy installed using PyPI (pip install mypy). Also, I have torch installed (pip install torch==1.2.0+cpu torchvision==0.4.0+cpu -f https://download.pytorch.org/whl/torch_stable.html). In code, I'm using the module torch.jit.
• What is the actual behavior/output? Module has no attribute "jit"
• What is the behavior/output you expect? No error
• What are the versions of mypy and Python you are using? I tried mypy 0.760, 0.761 as well as 0.720 (I was using this earlier, which had no error). Python version is 3.6.9.
• I'm using no extra flags, just mypy -p proj

Please feel free to edit the issue

[JukkaL]

Can you narrow down the failure to a small Python example? After pip torch type checking this program using mypy t.py generated no errors:

import torch.jit

Torch installs stubs files -- maybe the ones bundled with 1.2.0 are incomplete? Have you tried the latest torch?

[nameer]

Here's a sample code:

import torch
print(torch.jit)

And run mypy t.py.

I have tried the same with latest torch, and got the same result.

[hauntsaninja]

I also can't repro this, which makes two of us, so closing, although if you post more information, I'll check if I can repro. Do you have any extra mypy config?

[nameer]

Here's a sample code:

import torch
print(torch.jit)

And run mypy t.py.

I have tried the same with latest torch, and got the same result.

@hauntsaninja Did you try this? I can confirm that this is still happening in the version 0.782

mypy -c 'import torch; print(torch.jit)'

raises

<string>:1: error: Module has no attribute "jit"
Found 1 error in 1 file (checked 1 source file)

[gvanrossum]

Does it still fail if you change the program to

import torch.jit
print(torch.jit)

?

Without looking at the stubs I don't know if this will make a difference, but it easily could, if the stub for torch doesn't pre-import torch.jit in its __init__.

[hauntsaninja]

I couldn't install the torch versions you mentioned... but you'd said it didn't work on latest torch, which is what I can't repro. All in all, seems like an issue with torch for your version, so I don't think there's anything for mypy to do here. If torch releases bug fixes for old versions I'd recommend filing an issue on their tracker, otherwise your best option is probably to upgrade.

(del2) ~/tmp/del2 λ pip list
Package           Version
----------------- -------
future            0.18.2
mypy              0.782
mypy-extensions   0.4.3
numpy             1.19.1
Pillow            7.2.0
pip               20.2.1
setuptools        49.2.1
torch             1.6.0
torchvision       0.7.0
typed-ast         1.4.1
typing-extensions 3.7.4.2
wheel             0.34.2
(del2) ~/tmp/del2 λ mypy -c 'import torch; print(torch.jit)'                     
Success: no issues found in 1 source file
(del2) ~/tmp/del2 λ mypy -c 'import torch; reveal_type(torch.jit.script)'
<string>:1: note: Revealed type is 'def (obj: Any, optimize: Any =, _frames_up: Any =, _rcb: Any =) -> Any'