diff --git a/Library/Homebrew/keg.rb b/Library/Homebrew/keg.rb
index c657074c8790d76f9d80b39c3115a17869fb0c04..47c55e9daf3f823e12f4194af65d23bed14e6a4d 100644
--- a/Library/Homebrew/keg.rb
+++ b/Library/Homebrew/keg.rb
@@ -230,6 +230,10 @@ class Keg
     path.join("lib", "python2.7", "site-packages").directory?
   end
 
+  def python_pth_files_installed?
+    Dir["#{path}/lib/python2.7/site-packages/*.pth"].any?
+  end
+
   def app_installed?
     Dir["#{path}/{,libexec/}*.app"].any?
   end