Bug report

Bug description:

There's no easy way to describe this, but the recently added FancyCompleter dataclass` annotations are perhaps too fancy 😅

>>> import _colorize, pprint
>>> pprint.pprint(_colorize.FancyCompleter.__annotations__)
{'NoneType': '\x1b[1;32m',
 'bool': '\x1b[1;32m',
 'builtin_function_or_method': '\x1b[1;32m',
 'bytes': '\x1b[1;32m',
 'complex': '\x1b[1;32m',
 'float': '\x1b[1;32m',
 'function': '\x1b[1;32m',
 'int': '\x1b[1;32m',
 'method': '\x1b[1;32m',
 'method_descriptor': '\x1b[1;32m',
 'method_wrapper': '\x1b[1;32m',
 'module': '\x1b[1;32m',
 'str': '\x1b[1;32m',
 'type': '\x1b[1;32m',
 'wrapper_descriptor': '\x1b[1;32m'}

The problem is the following attribute

    str: str = ANSIColors.BOLD_GREEN

Removing this attribute results in expected behaviour

>>> import _colorize, pprint
>>> pprint.pprint(_colorize.FancyCompleter.__annotations__)
{'NoneType': <class 'str'>,
 'bool': <class 'str'>,
 'builtin_function_or_method': <class 'str'>,
 'bytes': <class 'str'>,
 'complex': <class 'str'>,
 'float': <class 'str'>,
 'function': <class 'str'>,
 'int': <class 'str'>,
 'method': <class 'str'>,
 'method_descriptor': <class 'str'>,
 'method_wrapper': <class 'str'>,
 'module': <class 'str'>,
 'type': <class 'str'>,
 'wrapper_descriptor': <class 'str'>}

It looks like the overwriting of the str type is an expected behaviour of the annotation scopes.
Quoting from @JelleZijlstra 's blog about implementing PEP 695 - https://jellezijlstra.github.io/pep695.html

When Alias is evaluated, we’ll expect to resolve T from a cell variable (created by the annotation scope for the class’s type parameters), so we use LOAD_CLASSDICT_OR_DEREF, and int from the builtins, so we use LOAD_CLASSDICT_OR_GLOBAL. But in both cases, we need to account for the possibility that the class namespace was modified to inject a value for T or int before we evaluate the value of the type alias; that is why we need to first look at classdict.

I am not sure what is the best non-hacky solution here.
A hacky solution could be to use a different attribute name (e.g. string) and special-case the code in PyREPL that uses FancyCompleter. Happy to submit a PR unless somebody else has a better idea.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-148406: Fix annotations of _colorize.FancyCompleter #148408