fix troostwijk changes

env_OLD/Lib/site-packages/pip/req/__init__.py

@@ -0,0 +1,10 @@
+from __future__ import absolute_import
+
+from .req_install import InstallRequirement
+from .req_set import RequirementSet, Requirements
+from .req_file import parse_requirements
+
+__all__ = [
+    "RequirementSet", "Requirements", "InstallRequirement",
+    "parse_requirements",
+]