self redirection solved

test/run.py

@@ -9,6 +9,7 @@ sys.path.append('.')
 import functions
 from _compatibility import unicode, BytesIO
 
+only_line = int(sys.argv[2]) if len(sys.argv) > 2 else None
 #functions.set_debug_function(functions.debug.print_to_stdout)
 
 def run_completion_test(correct, source, line_nr, line):
@@ -100,7 +101,7 @@ def completion_test(source):
                 correct = None
             else:
                 # reset the test, if only one specific test is wanted
-                if len(sys.argv) > 2 and line_nr != int(sys.argv[2]):
+                if only_line is not None and line_nr != only_line:
                     correct = None
                     import debug
                     debug.debug_function = \