[commands/cache] Add missing type annotation.
@@ -136,6 +136,7 @@ class CacheCommand(Command):
return self.remove_cache_items(options, ['*'])
def _wheels_cache_dir(self, options):
+ # type: (Values) -> str
return os.path.join(options.cache_dir, 'wheels')
def _find_wheels(self, options, pattern):
