Fixed bug causing --show-task-ratio to crash in Python 3. Fixes locustio#540.

Author: heyman

locust/main.py

@@ -376,7 +376,8 @@ def main():
  names = set(arguments) & set(locusts.keys())
  locust_classes = [locusts[n] for n in names]
  else:
- locust_classes = locusts.values()
+ # list() call is needed to consume the dict_view object in Python 3
+ locust_classes = list(locusts.values())
 
  if options.show_task_ratio:
  console_logger.info("\n Task ratio per locust class")