--experimental --max-line-length does not work on Python 3.12 with f-strings inside of a dict

[daniel-afana]

The error occurs when the max line length is exceeded, and there is a dict with an f-string inside

Python Code

s = "Some string"
fstring = {"some_key": f"There is a string value inside of an f string, which itself is a dictionary value {s})"}

Command Line

$ autopep8 --experimental --diff --max-line-length=79 my_file.py

Your Environment

• Python version: 3.12
• autopep8 version: 2.1.0
• Platform: linux (Ubuntu 20.04), macOS Sonoma 14.4.1

The Error

Traceback (most recent call last):
  File ".../virtualenvs/autopep-test/bin/autopep8", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 4499, in main
    results = fix_multiple_files(args.files, args, sys.stdout)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 4394, in fix_multiple_files
    ret = _fix_file((name, options, output))
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 4364, in _fix_file
    return fix_file(*parameters)
           ^^^^^^^^^^^^^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 3570, in fix_file
    fixed_source = fix_lines(fixed_source, options, filename=filename)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 3550, in fix_lines
    fixed_source = fix.fix()
                   ^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 617, in fix
    self._fix_source(filter_results(source=''.join(self.source),
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 559, in _fix_source
    modified_lines = fix(result, logical)
                     ^^^^^^^^^^^^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 987, in fix_long_line_logically
    return self.fix_long_line_physically(result)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 1024, in fix_long_line_physically
    fixed = self.fix_long_line(
            ^^^^^^^^^^^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 1053, in fix_long_line
    fixed = get_fixed_long_line(
            ^^^^^^^^^^^^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 1622, in get_fixed_long_line
    sorted(set(candidates).union([target, original])),
           ^^^^^^^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 1902, in shorten_line
    for shortened in _shorten_line_at_tokens_new(
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 2783, in _shorten_line_at_tokens_new
    fixed = _reflow_lines(parsed_tokens, indentation, max_line_length,
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 2760, in _reflow_lines
    item.reflow(lines, continued_indent, break_after_open_bracket)
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 2385, in reflow
    reflowed_lines.add(self, len(continued_indent),
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 2053, in add
    self._add_item(obj, indent_amt)
  File ".../virtualenvs/autopep-test/lib/python3.12/site-packages/autopep8.py", line 2202, in _add_item
    assert self._bracket_depth >= 0
           ^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError

[hhatto]

fix in v2.1.2
https://pypi.org/project/autopep8/2.1.2/