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"""Command-line implementation of flake8."""
import sys
from typing import Optional
from typing import Sequence

from flake8.main import application


def main(argv: Optional[Sequence[str]] = None) -> int:
    """Execute the main bit of the application.

    This handles the creation of an instance of :class:`Application`, runs it,
    and then exits the application.

    :param argv:
        The arguments to be passed to the application for parsing.
    """
    if argv is None:
        argv = sys.argv[1:]

    app = application.Application()
    app.run(argv)
    return app.exit_code()