--- /usr/bin/pip3	2019-11-12 17:37:34.793131862 +0100

+++ pip3	2019-11-12 17:40:42.014107134 +0100

@@ -2,7 +2,19 @@

 # -*- coding: utf-8 -*-

 import re

 import sys

-from pip._internal.main import main

+try:

+    from pip._internal.main import main

+except ImportError:

+    try:

+        # If the user has downgraded pip, the above import will fail.

+        # Let's try older methods of invoking it:

+

+        # pip 19 uses this

+        from pip._internal import main

+    except ImportError:

+        # older pip versions use this

+        from pip import main

+

 if __name__ == '__main__':

     sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])

     sys.exit(main())