remove error message for Ctrl+C

tests/rateLimiter.py

@@ -23,6 +23,9 @@ rate *= 1.4   # compensation for excluding i/o time (experimentally determined)
 start = time.time()
 total_read = 0
 
+sys.stderr.close()  # remove error message, for Ctrl+C
+
+try:
   buf = " "
   while len(buf):
     now = time.time()
@@ -40,3 +43,6 @@ while len(buf):
     wait_time = max(read_end - read_start, write_end - write_start)
     start += wait_time   # exclude delay of the slowest
     total_read += len(buf)
+
+except (KeyboardInterrupt, BrokenPipeError) as e:
+    pass