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