Close the file after tokenizing it. Because the open file object was

bound to a module global, the file object remained opened throughout
the test suite run.

Lib/test/test_tokenize.py

@@ -3,7 +3,10 @@ import tokenize, os, sys
 
 if verbose:
     print 'starting...'
-file = open(findfile('tokenize_tests'+os.extsep+'py'))
-tokenize.tokenize(file.readline)
+
+f = file(findfile('tokenize_tests'+os.extsep+'py'))
+tokenize.tokenize(f.readline)
+f.close()
+
 if verbose:
     print 'finished'