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IndexError: Cannot choose from an empty sequence

See original GitHub issue

Description of issue / feature request

  File "/media/jawahar/jon1/new_project/bm/testDev/lib/python3.6/site-packages/locust/core.py", line 268, in run
    self.schedule_task(self.get_next_task())
  File "/media/jawahar/jon1/new_project/bm/testDev/lib/python3.6/site-packages/locust/core.py", line 329, in get_next_task
    return random.choice(self.tasks)
  File "/media/jawahar/jon1/new_project/bm/testDev/lib/python3.6/random.py", line 258, in choice
    raise IndexError('Cannot choose from an empty sequence') from None
IndexError: Cannot choose from an empty sequence

Repeately i am getting this error after Start swarming number of users.

Expected behavior

No Error related to this.

Actual behavior

Traceback showed about

Environment settings (for bug reports)

OS:Ubuntu 17
Python version: 3.6.5
Locust version: 0.8.0/0.8.1

Steps to reproduce (for bug reports)

Run some api and you will get this error

Issue Analytics

State:
Created 5 years ago
Comments:8 (5 by maintainers)

Top GitHub Comments

2reactions

cgoldbergcommented, May 27, 2018

if you write an invalid locustfile and don’t declare tasks, expect things to break. As I said previously, the error message could be improved.

2reactions

cgoldbergcommented, May 26, 2018

IndexError: Cannot choose from an empty sequence

@jawahar273, That exception gets raised when there are no tasks defined. Can you verify you actually declared some tasks in your locustfile? (either use the @tasks decorator or define a class that inherits from TaskSet)

for Locust devs, A nice enhancement would be to catch the IndexError in /locust/core.py and raise a RuntimeError instead… It should display an intuitive message like “No tasks defined in locustfile”, and then exit.