When working these changes back upstream to pip, we realized that the
previous fix wasn't ideal since unvendoring the packages broke the
imports. For example, if urllib3 were unvendored, then the following
would fail:
from requests.packages import urllib3
While discussion the issue, Donald Stufft (@dstufft) and I realized the
simplest solution is to simply add an alias per vendored dependency. The
resulting changes are simple and effective. It prevents the issue in
2.5.2 and 2.5.3 where the following would work:
from requests.packages import webbrowser
This now appropriately raises an ImportError.
Closes#2465
Ian Cordasco