Editing File: /lib/python3.8/site-packages/pip/_internal/commands/check.py

# The following comment should be removed at some point in the future.
# mypy: disallow-untyped-defs=False

import logging

from pip._internal.cli.base_command import Command
from pip._internal.operations.check import (
    check_package_set,
    create_package_set_from_installed,
)
from pip._internal.utils.misc import write_output

logger = logging.getLogger(__name__)

class CheckCommand(Command):
    """Verify installed packages have compatible dependencies."""

usage = """
      %prog [options]"""

def run(self, options, args):
        package_set, parsing_probs = create_package_set_from_installed()
        missing, conflicting = check_package_set(package_set)

for project_name in missing:
            version = package_set[project_name].version
            for dependency in missing[project_name]:
                write_output(
                    "%s %s requires %s, which is not installed.",
                    project_name, version, dependency[0],
                )

for project_name in conflicting:
            version = package_set[project_name].version
            for dep_name, dep_version, req in conflicting[project_name]:
                write_output(
                    "%s %s has requirement %s, but you have %s %s.",
                    project_name, version, req, dep_name, dep_version,
                )

if missing or conflicting or parsing_probs:
            return 1
        else:
            write_output("No broken requirements found.")

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