dependency_tree broken tomli<2.0.0,>=0.2.6, it should be using latest version 2.0.0

[roshanguptamca]

Describe the bug
black 21.12b0 requires tomli<2.0.0,>=0.2.6, but you have tomli 2.0.0 which is incompatible.

To Reproduce

For example, take this code:

this = "code"

And run it with these arguments:

$ black file.py --target-version py39

The resulting error is:

cannot format file.py: INTERNAL ERROR: ...

Expected behavior

Environment

• Black's version:
• OS and Python version:

Additional context

[MarcoGorelli]

You'll have to downgrade your version of tomli, due to the upper bound on tomli in black

[JelleZijlstra]

We can probably allow tomli 2 (mypy did the same recently).

[MarcoGorelli]

likewise pytest pytest-dev/pytest#8881

[ichard26]

I'm pretty sure @hukkin, the author behind tomli, is the one who put this pin here, would probably be a good idea to ask them to weigh in.

[hukkin]

Black is fully compatible with Tomli v2 starting from this PR here https://github.com/psf/black/pull/2431/files

Also, now that I had my one (and hopefully only) chance to make breaking changes to the API, I don't really object removing the upper pinning altogether. In case I find the need to break API in the future I'll try to do at least a year long deprecation period before.

Note that PR #2408 includes moving the upper pin if you are otherwise happy with the changes there.

[hukkin]

BTW just out of curiosity: Do I deduce correctly from this issue that Black checks its dependency versions at runtime? Is that really necessary? Wouldn't it be better to leave dependency checking to the installer (typically pip) and make Black use whatever versions are available? And consider issues like this an error on user/environment/installer side.

[MarcoGorelli]

BTW just out of curiosity: Do I deduce correctly from this issue that Black checks its dependency versions at runtime? Is that really necessary? Wouldn't it be better to leave dependency checking to the installer (typically pip) and make Black use whatever versions are available? And consider issues like this an error on user/environment/installer side.

pretty sure the error here comes at installation, the $ black file.py --target-version py39 in the issue is part of the issue template

[JelleZijlstra]

Do I deduce correctly from this issue that Black checks its dependency versions at runtime? Is that really necessary?

It doesn't. If you are talking about the cannot format file.py: INTERNAL ERROR line, that's part of the issue template. If you're reporting a bug, please don't keep that part around if you don't actually get an internal error.

[roshanguptamca]

You'll have to downgrade your version of tomli, due to the upper bound on tomli in black

Yes thanks for reply, We did it as of now to go further until having permanent soluton.