Fix the roundtripping function.
diff --git a/Lib/test/test_tokenize.py b/Lib/test/test_tokenize.py
index 138ed74..d6c3777 100644
--- a/Lib/test/test_tokenize.py
+++ b/Lib/test/test_tokenize.py
@@ -123,7 +123,7 @@
 def roundtrip(s):
     f = StringIO(s)
     source = untokenize(generate_tokens(f.readline))
-    print(source, end=' ')
+    print(source, end="")
 
 # This is an example from the docs, set up as a doctest.
 def decistmt(s):