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name : __init__.py
 import collections
import logging
from dataclasses import dataclass
from typing import Generator, List, Optional, Sequence, Tuple

from pip._internal.utils.logging import indent_log

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

__all__ = [
    "RequirementSet",
    "InstallRequirement",
    "parse_requirements",
    "install_given_reqs",
]

logger = logging.getLogger(__name__)


@dataclass(frozen=True)
class InstallationResult:
    name: str


def _validate_requirements(
    requirements: List[InstallRequirement],
) -> Generator[Tuple[str, InstallRequirement], None, None]:
    for req in requirements:
        assert req.name, f"invalid to-be-installed requirement: {req}"
        yield req.name, req


def install_given_reqs(
    requirements: List[InstallRequirement],
    global_options: Sequence[str],
    root: Optional[str],
    home: Optional[str],
    prefix: Optional[str],
    warn_script_location: bool,
    use_user_site: bool,
    pycompile: bool,
) -> List[InstallationResult]:
    """
    Install everything in the given list.

    (to be called after having downloaded and unpacked the packages)
    """
    to_install = collections.OrderedDict(_validate_requirements(requirements))

    if to_install:
        logger.info(
            "Installing collected packages: %s",
            ", ".join(to_install.keys()),
        )

    installed = []

    with indent_log():
        for req_name, requirement in to_install.items():
            if requirement.should_reinstall:
                logger.info("Attempting uninstall: %s", req_name)
                with indent_log():
                    uninstalled_pathset = requirement.uninstall(auto_confirm=True)
            else:
                uninstalled_pathset = None

            try:
                requirement.install(
                    global_options,
                    root=root,
                    home=home,
                    prefix=prefix,
                    warn_script_location=warn_script_location,
                    use_user_site=use_user_site,
                    pycompile=pycompile,
                )
            except Exception:
                # if install did not succeed, rollback previous uninstall
                if uninstalled_pathset and not requirement.install_succeeded:
                    uninstalled_pathset.rollback()
                raise
            else:
                if uninstalled_pathset and requirement.install_succeeded:
                    uninstalled_pathset.commit()

            installed.append(InstallationResult(req_name))

    return installed
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