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For_More_Tools:
import abc
from pip._vendor.six import add_metaclass
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
if MYPY_CHECK_RUNNING:
from typing import Optional
from pip._vendor.pkg_resources import Distribution
from pip._internal.req import InstallRequirement
from pip._internal.index.package_finder import PackageFinder
@add_metaclass(abc.ABCMeta)
class AbstractDistribution(object):
"""A base class for handling installable artifacts.
The requirements for anything installable are as follows:
- we must be able to determine the requirement name
(or we can't correctly handle the non-upgrade case).
- for packages with setup requirements, we must also be able
to determine their requirements without installing additional
packages (for the same reason as run-time dependencies)
- we must be able to create a Distribution object exposing the
above metadata.
"""
def __init__(self, req):
# type: (InstallRequirement) -> None
super(AbstractDistribution, self).__init__()
self.req = req
@abc.abstractmethod
def get_pkg_resources_distribution(self):
# type: () -> Optional[Distribution]
raise NotImplementedError()
@abc.abstractmethod
def prepare_distribution_metadata(self, finder, build_isolation):
# type: (PackageFinder, bool) -> None
raise NotImplementedError()