AlexWaygood

import ast
import sys
import keyword
import seaborn
from pathlib import Path
from collections import Counter
from dataclasses import dataclass


LENGTHS_COUNT = Counter[int]()

AlexWaygood

import os
from collections import deque
from collections.abc import Iterator, Sequence
from typing import Final, Protocol


class SeekableBytesFile(Protocol):
    def seek(self, position: int, whence: int = ..., /) -> int: ...
    def read(self, amount: int, /) -> bytes: ...

AlexWaygood

from types import SimpleNamespace

AnsiColors = SimpleNamespace(
    BOLD_GREEN="\x1b[1;32m",
    BOLD_MAGENTA="\x1b[1;35m",
    BOLD_RED="\x1b[1;31m",
    GREEN="\x1b[32m",
    GREY = "\x1b[90m"
    MAGENTA = "\x1b[35m"
    RED = "\x1b[31m"

AlexWaygood

"""Proof of concept for how `__annotations__` issues with metaclasses could be solved under PEP 649.

See https://discuss.python.org/t/pep-749-implementing-pep-649/54974/28 for more context.

To experiment with this proof of concept:
1. Clone CPython
2. Create a fresh build of the main branch according to the instructions in the devguide.
3. Save this file to the repository root.
4. Run `./python.exe annotations-demo.py --test` to run tests,
   or `PYTHON_BASIC_REPL=1 ./python.exe -i annotations-demo.py` to play with it in the REPL.

AlexWaygood

type BasesList = list[type]
type Mro = list[type]

def merge(seqs: list[BasesList]) -> Mro:
    print(f"Merging {seqs}")
    mro: Mro = []
    i = 1

    while True:
        print(f"{mro=}")