File: check_mypy_version.py

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import re
import sys
from pathlib import Path

from mypy.plugin import Plugin


def get_correct_mypy_version():
    # there's probably a more elegant way to do this
    match, = re.finditer(
        r'mypy==(\d+(?:\.\d+)*)',
        Path('.circleci/docker/requirements-ci.txt').read_text(),
    )
    version, = match.groups()
    return version


def plugin(version: str):
    correct_version = get_correct_mypy_version()
    if version != correct_version:
        print(f'''\
You are using mypy version {version}, which is not supported
in the PyTorch repo. Please switch to mypy version {correct_version}.

For example, if you installed mypy via pip, run this:

    pip install mypy=={correct_version}

Or if you installed mypy via conda, run this:

    conda install -c conda-forge mypy={correct_version}
''', file=sys.stderr)
    return Plugin