AttributeError: 'EntryPoints' object has no attribute 'get' raised when using flake8 with Python 3.12

[ehogan]

how did you install flake8?

$ conda create --name test-flake8 python=3.12 flake8

unmodified output of flake8 --bug-report

Traceback (most recent call last):
  File "/conda/envs/test-flake8/bin/flake8", line 10, in <module>
    sys.exit(main())
             ^^^^^^
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/main/cli.py", line 22, in main
    app.run(argv)
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/main/application.py", line 375, in run
    self._run(argv)
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/main/application.py", line 363, in _run
    self.initialize(argv)
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/main/application.py", line 343, in initialize
    self.find_plugins(config_finder)
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/main/application.py", line 157, in find_plugins
    self.check_plugins = plugin_manager.Checkers(local_plugins.extension)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/plugins/manager.py", line 363, in __init__
    self.manager = PluginManager(
                   ^^^^^^^^^^^^^^
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/plugins/manager.py", line 243, in __init__
    self._load_entrypoint_plugins()
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/plugins/manager.py", line 261, in _load_entrypoint_plugins
    eps = importlib_metadata.entry_points().get(self.namespace, ())
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'EntryPoints' object has no attribute 'get'

describe the problem

what I expected to happen

When I run any flake8 command using the version of flake8 from the Conda environment (created as above) I get the same traceback (provided above and below).

I do not see this problem if I specify python=3.11 when creating the Conda environment.

commands ran

$ flake8 --help
Traceback (most recent call last):
  File "/conda/envs/test-flake8/bin/flake8", line 10, in <module>
    sys.exit(main())
             ^^^^^^
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/main/cli.py", line 22, in main
    app.run(argv)
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/main/application.py", line 375, in run
    self._run(argv)
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/main/application.py", line 363, in _run
    self.initialize(argv)
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/main/application.py", line 343, in initialize
    self.find_plugins(config_finder)
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/main/application.py", line 157, in find_plugins
    self.check_plugins = plugin_manager.Checkers(local_plugins.extension)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/plugins/manager.py", line 363, in __init__
    self.manager = PluginManager(
                   ^^^^^^^^^^^^^^
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/plugins/manager.py", line 243, in __init__
    self._load_entrypoint_plugins()
  File "/conda/envs/test-flake8/lib/python3.12/site-packages/flake8/plugins/manager.py", line 261, in _load_entrypoint_plugins
    eps = importlib_metadata.entry_points().get(self.namespace, ())
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'EntryPoints' object has no attribute 'get'

Thank you! :)

[asottile]

you are using a very old version of flake8 -- please search the issue tracker next time there are several duplicates and resolutions