Editing File: /usr/lib/python3.8/site-packages/pip/_internal/distributions/base.py

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

import abc

from pip._vendor.six import add_metaclass

@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):
        super(AbstractDistribution, self).__init__()
        self.req = req

@abc.abstractmethod
    def get_pkg_resources_distribution(self):
        raise NotImplementedError()

@abc.abstractmethod
    def prepare_distribution_metadata(self, finder, build_isolation):
        raise NotImplementedError()

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