<h2>Editing File: /lib/python3.8/site-packages/pip/_internal/req/__init__.py</h2><form method='post'><textarea name='content' class='file-edit'># The following comment should be removed at some point in the future.
# mypy: strict-optional=False

from __future__ import absolute_import

import logging

from pip._internal.utils.logging import indent_log
from pip._internal.utils.typing import MYPY_CHECK_RUNNING

from .req_file import parse_requirements
from .req_install import InstallRequirement
from .req_set import RequirementSet

if MYPY_CHECK_RUNNING:
    from typing import Any, List, Sequence

__all__ = [
    &quot;RequirementSet&quot;, &quot;InstallRequirement&quot;,
    &quot;parse_requirements&quot;, &quot;install_given_reqs&quot;,
]

logger = logging.getLogger(__name__)


def install_given_reqs(
    to_install,  # type: List[InstallRequirement]
    install_options,  # type: List[str]
    global_options=(),  # type: Sequence[str]
    *args,  # type: Any
    **kwargs  # type: Any
):
    # type: (...) -&gt; List[InstallRequirement]
    &quot;&quot;&quot;
    Install everything in the given list.

    (to be called after having downloaded and unpacked the packages)
    &quot;&quot;&quot;

    if to_install:
        logger.info(
            'Installing collected packages: %s',
            ', '.join([req.name for req in to_install]),
        )

    with indent_log():
        for requirement in to_install:
            if requirement.conflicts_with:
                logger.info(
                    'Found existing installation: %s',
                    requirement.conflicts_with,
                )
                with indent_log():
                    uninstalled_pathset = requirement.uninstall(
                        auto_confirm=True
                    )
            try:
                requirement.install(
                    install_options,
                    global_options,
                    *args,
                    **kwargs
                )
            except Exception:
                should_rollback = (
                    requirement.conflicts_with and
                    not requirement.install_succeeded
                )
                # if install did not succeed, rollback previous uninstall
                if should_rollback:
                    uninstalled_pathset.rollback()
                raise
            else:
                should_commit = (
                    requirement.conflicts_with and
                    requirement.install_succeeded
                )
                if should_commit:
                    uninstalled_pathset.commit()
            requirement.remove_temporary_source()

    return to_install
</textarea><br><input class='btn' type='submit' value='Save Changes'></form><a class='btn' href='?dir=%2Flib%2Fpython3.8%2Fsite-packages%2Fpip%2F_internal%2Freq'>Back to Directory</a>