--- a/lib/python3.8/site-packages/pip/_vendor/cachecontrol/cache.py	Mon Jul 27 03:47:31 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,39 +0,0 @@
-"""
-The cache object API for implementing caches. The default is a thread
-safe in-memory dictionary.
-"""
-from threading import Lock
-
-
-class BaseCache(object):
-
-    def get(self, key):
-        raise NotImplementedError()
-
-    def set(self, key, value):
-        raise NotImplementedError()
-
-    def delete(self, key):
-        raise NotImplementedError()
-
-    def close(self):
-        pass
-
-
-class DictCache(BaseCache):
-
-    def __init__(self, init_dict=None):
-        self.lock = Lock()
-        self.data = init_dict or {}
-
-    def get(self, key):
-        return self.data.get(key, None)
-
-    def set(self, key, value):
-        with self.lock:
-            self.data.update({key: value})
-
-    def delete(self, key):
-        with self.lock:
-            if key in self.data:
-                self.data.pop(key)