Python 3.11 ModuleNotFoundError: No module named 'tomllib'

Describe the bug

In Python 3.11 it is raising exception with ModuleNotFoundError.

To Reproduce

Install Python 3.11

$ black .

The resulting error is:

Traceback (most recent call last):
  File "/home/runner/work/autodonate/autodonate/.venv/bin/black", line 5, in <module>
    from black import patched_main
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/autodonate/autodonate/.venv/lib/python3.11/site-packages/black/__init__.py", line 52, in <module>
    from black.files import (
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/autodonate/autodonate/.venv/lib/python3.11/site-packages/black/files.py", line 25, in <module>
    import tomllib
    ^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'tomllib'

Environment

Black’s version: 22.3.0
OS and Python version: Github Actions Ubuntu, Python 3.11

Additional context

Logs from my CI. Also, why you haven’t did any CI on 3.11?

Issue Analytics

State:
Created a year ago
Comments:5

Top GitHub Comments

2reactions

pawamoycommented, Apr 1, 2022

Would it be possible to change to a try/except (and put back tomli as dep without marker) instead of a condition on the Python version, at least until tomllib is available in Python 3.11 (alpha or not)? I understand 3.11 is still alpha, but I believe many users want to test their code and run their CI tools (i.e. Black) on Python 3.11. Of course I can pin Black to <22.3 for Python 3.11 only (with markers), but that’s a bit cumbersome to do in every project 😕

1reaction

JelleZijlstracommented, Apr 1, 2022

@pawamoy that’s fair, opened #2987

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