TE-2547 Add dependency analysis scripts

scripts/dependencies/on_package.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+"""
+List any modules that import code from the given package.  This can be used
+to determine if the package can be safely removed, or just to understand
+what context it's used in.  The package argument to the script should be
+formatted as shown in these examples:
+
+* scripts/dependencies/on_package.py nose
+* scripts/dependencies/on_package.py third_parth_auth
+* scripts/dependencies/on_package.py cms/djangoapps/verify_student
+
+This script counts on scripts/dependencies/enumerate.sh having already
+been run in order to generate a dependency data file to work from.
+"""
+from __future__ import absolute_import, print_function
+
+import os
+import re
+import sys
+
+pattern = re.compile(u'^{}'.format(sys.argv[1]))
+
+data_path = 'reports/dependencies/dependencies.txt'
+if not os.path.exists(data_path):
+    print('The dependencies data file is unavailable; run scripts/dependencies/enumerate.sh first.')
+with open(data_path, 'r') as f:
+    for dep in map(eval, f):
+        (from_root, from_name), (to_root, to_name) = dep
+        if to_name is None:
+            continue
+        if pattern.search(to_name) and not pattern.search(from_name):
+            # We usually don't care about dependencies between modules in site-packages
+            if from_root.endswith(u'site-packages') and to_root.endswith(u'site-packages'):
+                continue
+            print(dep)