install.py 文件源码

def _build_package_finder(self, options, index_urls, session):
        """
        Create a package finder appropriate to this install command.
        This method is meant to be overridden by subclasses, not
        called directly.
        """
        return PackageFinder(find_links=options.find_links,
                             index_urls=index_urls,
                             use_wheel=options.use_wheel,
                             allow_external=options.allow_external,
                             allow_unverified=options.allow_unverified,
                             allow_all_external=options.allow_all_external,
                             allow_all_prereleases=options.pre,
                             process_dependency_links=
                                options.process_dependency_links,
                             session=session,
                            )