minor refactoring

tools/_init_paths.py

@@ -5,18 +5,21 @@
 # Written by Ross Girshick
 # --------------------------------------------------------
 
+"""Set up paths for Fast R-CNN."""
+
 import os.path as osp
 import sys
 
+def add_path(path):
+    if path not in sys.path:
+        sys.path.insert(0, path)
+
 this_dir = osp.dirname(__file__)
 
 # Add caffe to PYTHONPATH
 caffe_path = osp.join(this_dir, '..', 'caffe-fast-rcnn', 'python')
+add_path(caffe_path)
 
-if caffe_path not in sys.path:
-  sys.path.insert(0, caffe_path)
-
+# Add lib to PYTHONPATH
 lib_path = osp.join(this_dir, '..', 'lib')
-
-if lib_path not in sys.path:
-  sys.path.insert(0, lib_path)
+add_path(lib_path)