Use "raise from"

[m-aciek]

Proposed changes

For wlc exceptions indicate that an exception is a direct consequence of another (see exception chaining).

In practice it changes a following example traceback:

  File "projects/wlc/wlc/__init__.py", line 201, in invoke_request
    response.raise_for_status()
  File ".pyenv/versions/wlc/lib/python3.11/site-packages/requests/models.py", line 1021, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 429 Client Error: Too Many Requests for url: https://hosted.weblate.org/api/projects/python-docs/

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "projects/python-docs-weblate/.update-translation.py", line 69, in <module>
    _update_translation(options.language, weblate_key=weblate_key)
  …
  File "projects/wlc/wlc/__init__.py", line 128, in process_error
    raise WeblateThrottlingError
wlc.WeblateThrottlingError: Throttling on the server.

into:

Traceback (most recent call last):
  File "projects/wlc/wlc/__init__.py", line 201, in invoke_request
    response.raise_for_status()
  File ".pyenv/versions/wlc/lib/python3.11/site-packages/requests/models.py", line 1021, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 429 Client Error: Too Many Requests for url: https://hosted.weblate.org/api/projects/python-docs/

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "projects/python-docs-weblate/.update-translation.py", line 69, in <module>
    _update_translation(options.language, weblate_key=weblate_key)
  …
  File "projects/wlc/wlc/__init__.py", line 128, in process_error
    raise WeblateThrottlingError from error
wlc.WeblateThrottlingError: Throttling on the server.

(Note the linking phrase between the tracebacks.)

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

[codecov]

Codecov Report

Merging #455 (7512c2a) into main (4d1c0a7) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #455   +/-   ##
=======================================
  Coverage   98.97%   98.97%           
=======================================
  Files           6        6           
  Lines        1655     1655           
  Branches      217      217           
=======================================
  Hits         1638     1638           
  Misses          8        8           
  Partials        9        9           

Files Changed	Coverage Δ
wlc/__init__.py	97.57% <100.00%> (ø)

[nijel]

It now has conflicts after changes from your other PR. Moreover, can you please enable corresponding ruff checks so that this is linted?

[nijel]

Merged, thanks for your contribution!