alexrudy/flask-3.0.1-cli-bug

In a minimal flask app, running flask run --extra-files= or using any other argument that internally uses SeparatedPathType results in TypeError: super(type, obj): obj must be an instance or subtype of type

Create a minimal flask application (follow the Quickstart).
Install flask==3.0.1 (this bug is not reproducible with 3.0.0 AFAIK)
Run flask run --extra-files=a

Expected Behavior: The server should start up.

Actual Behavior: The command raises a Type Error and exits with code 1

Full Traceback

Traceback (most recent call last):
  File ".../flask-cli-bug/..venv/bin/flask", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/flask/cli.py", line 1105, in main
    cli.main()
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/click/core.py", line 1686, in invoke
    sub_ctx = cmd.make_context(cmd_name, args, parent=ctx)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/click/core.py", line 943, in make_context
    self.parse_args(ctx, args)
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/click/core.py", line 1408, in parse_args
    value, args = param.handle_parse_result(ctx, opts, args)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/click/core.py", line 2400, in handle_parse_result
    value = self.process_value(ctx, value)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/click/core.py", line 2356, in process_value
    value = self.type_cast_value(ctx, value)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/click/core.py", line 2344, in type_cast_value
    return convert(value)
           ^^^^^^^^^^^^^^
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/click/core.py", line 2316, in convert
    return self.type(value, param=self, ctx=ctx)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/click/types.py", line 83, in __call__
    return self.convert(value, param, ctx)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/flask/cli.py", line 861, in convert
    return [super().convert(item, param, ctx) for item in items]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../flask-cli-bug/..venv/lib/python3.11/site-packages/flask/cli.py", line 861, in <listcomp>
    return [super().convert(item, param, ctx) for item in items]
            ^^^^^^^
TypeError: super(type, obj): obj must be an instance or subtype of type

Environment:

Python version: 3.11.6
Flask version: 3.0.1

Output from pip freeze:

blinker==1.7.0
click==8.1.7
Flask==3.0.1
itsdangerous==2.1.2
Jinja2==3.1.3
MarkupSafe==2.1.4
Werkzeug==3.0.1

alexrudy / flask-3.0.1-cli-bug

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