Fix requests.packages not having package attributes

Fixes #4104

AUTHORS.rst

@@ -182,3 +182,4 @@ Patches and Suggestions
 - David Fontenot (`@davidfontenot <https://github.com/davidfontenot>`_)
 - Shmuel Amar (`@shmuelamar <https://github.com/shmuelamar>`_)
 - Gary Wu (`@garywu <https://github.com/garywu>`_)
+- Ryan Pineo (`@ryanpineo <https://github.com/ryanpineo>`_)

requests/packages.py

@@ -4,7 +4,7 @@ import sys
 # I don't like it either. Just look the other way. :)
 
 for package in ('urllib3', 'idna', 'chardet'):
-    __import__(package)
+    locals()[package] = __import__(package)
     # This traversal is apparently necessary such that the identities are
     # preserved (requests.packages.urllib3.* is urllib3.*)
     for mod in list(sys.modules):

tests/test_packages.py

@@ -0,0 +1,13 @@
+import requests
+
+
+def test_can_access_urllib3_attribute():
+    requests.packages.urllib3
+
+
+def test_can_access_idna_attribute():
+    requests.packages.idna
+
+
+def test_can_access_chardet_attribute():
+    requests.packages.chardet