ModuleNotFoundError: No module named 'tomli'

[mgedmin]

I'm using Python 3.10 on Ubuntu 22.10, with pipx to manage my virtual envs for tools.

Something seems to be wrong with the tomllib dependency on Python < 3.11:

$ pipx install scriv
$ scriv --help
Traceback (most recent call last):
  File "/home/mg/.local/pipx/venvs/scriv/lib/python3.10/site-packages/scriv/config.py", line 13, in <module>
    import tomllib
ModuleNotFoundError: No module named 'tomllib'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/mg/.local/bin/scriv", line 5, in <module>
    from scriv.cli import cli
  File "/home/mg/.local/pipx/venvs/scriv/lib/python3.10/site-packages/scriv/cli.py", line 9, in <module>
    from .collect import collect
  File "/home/mg/.local/pipx/venvs/scriv/lib/python3.10/site-packages/scriv/collect.py", line 11, in <module>
    from .scriv import Scriv
  File "/home/mg/.local/pipx/venvs/scriv/lib/python3.10/site-packages/scriv/scriv.py", line 13, in <module>
    from .changelog import Changelog, Fragment
  File "/home/mg/.local/pipx/venvs/scriv/lib/python3.10/site-packages/scriv/changelog.py", line 10, in <module>
    from .config import Config
  File "/home/mg/.local/pipx/venvs/scriv/lib/python3.10/site-packages/scriv/config.py", line 15, in <module>
    import tomli as tomllib  # type: ignore
ModuleNotFoundError: No module named 'tomli'

Full set of versions installed in the venv:

$ pipx runpip scriv list
Package            Version
------------------ ---------
attrs              22.2.0
certifi            2022.12.7
charset-normalizer 3.0.1
click              8.1.3
click-log          0.4.0
idna               3.4
Jinja2             3.1.2
MarkupSafe         2.1.2
pip                22.3.1
requests           2.28.2
scriv              1.2.0
setuptools         65.7.0
urllib3            1.26.14
wheel              0.38.4

[mgedmin]

~/.local/pipx/venvs/scriv/lib/python3.10/site-packages/scriv-1.2.0.dist-info/METADATA says

Requires-Dist: tomli ; extra == 'toml'
Requires-Dist: python-version (<3.11) ; extra == 'toml'

so I think the dependencies are working as designed? except that scriv isn't supposed to use anything toml-related unless you opt it by requesting the toml extra?

[Orteko]

Note that I experienced the same thing on Ubuntu 22.04.1 but worked around it with an sudo apt install python3-tomli.

[nedbat]

Oops, sorry about that! This is fixed in 985e72b.

[mgedmin]

I have to say I stared at the offending code for five minutes until I finally understood where the problem was!

[nedbat]

Me too!

This is now released as part of scriv 1.2.1.