SequentialTaskSet is broken when using local class members (headless mode)

[efology]

Describe the bug

Trying to execute a SequentialTaskSet in headless mode, store result's from first task, and use it in second task

Expected behavior

Execute first task, retrieve json, store it as dict in SequentialTaskSet object, execute second task and access the variable.

Actual behavior

Execute first task, json is retrieved, stored. In second task upon trying to access the stored data, I get following exceptions:
1.) AttributeError: 'dict' object has no attribute '_state'
2.) AttributeError: 'dict' object has no attribute 'environment'

Steps to reproduce

Start provided mockserver.py (flask) on localhost:5000, then run provided locust file (sequence_test.py) with command lines specified

Environment

• OS:
  Ubuntu 18.04.4 LTS running in WSL
  Linux PSALA059 4.4.0-18990-Microsoft Add/improve support for running Locust distributed #1-Microsoft Sat Sep 21 17:04:00 PST 2019 x86_64 x86_64 x86_64 GNU/Linux
• Python version:
  3.6.9
• Locust version:
  locust 1.0.1
• Locust command line that you ran:
  run master locust:
  locust -f sequence_test.py --host=http://localhost:5000 --master --expect-workers=1 --headless -u 1 -r 1 -t 1h

run worker locust:
locust -f sequence_test.py --worker --master-host=127.0.0.1 --host=http://localhost:5000

• Locust file contents (anonymized if necessary):
  locust-1.0.1-sequence-bug.zip

[cyberw]

Hi! I think the problem is that you're overwriting the self.user variable. It refers to the User class (it used to be self.locust). Name it anything else and it should work.

[cyberw]

We could prevent this kind of issues by making user a read-only property. Probably wasnt as big a problem when the variable name was more uncommon (locust), but now I can definitely see more people running in to this.

Something like this.

class TaskSet(object):
    def __init__(self, parent):
        self._user = ... # instead of self.user = ...

    @property
    def user(self):
        return self._user

[efology]

ooooh I see :) yeah it makes sense, I'll rename it
EDIT: it works now, thanks!