Engaging sensor ImportError: cannot import name 'TypeGuard'

[DavidMeu]

Recieving the following error while trying to engage sensor:

st2.STDERR ERROR [-] Failed to load sensor class from file "/opt/stackstorm/packs/some_pack/sensors/some_sensor.py" (sensor file most likely doesn't exist or contains invalid syntax): cannot import name 'TypeGuard'

Traceback (most recent call last):
  File "/opt/stackstorm/st2/lib/python3.6/site-packages/st2reactor/container/sensor_wrapper.py", line 299, in _get_sensor_insta
nce
    class_name=self._class_name)
  File "/opt/stackstorm/st2/lib/python3.6/site-packages/st2common/util/loader.py", line 146, in register_plugin_class
    module = imp.load_source(module_name, file_path)
  File "/opt/stackstorm/virtualenvs/some_pack/lib/python3.6/imp.py", line 172, in load_source
    module = _load(spec)
  File "<frozen importlib._bootstrap>", line 684, in _load
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/opt/stackstorm/packs/some_pack/sensors/some_sensor.py", line 3, in <module>
    from typing_extensions import TypeGuard
ImportError: cannot import name 'TypeGuard'

Saw the source of the module is: /opt/stackstorm/st2/lib/python3.6/site-packages/typing_extensions.py
But not sure who is responsible for installing it.

st2 3.4.0, on Python 3.6.9

[amanda11]

From your stack trace is the sensor that you are trying to use is trying to import that.

Taking a look at https://stackoverflow.com/questions/69174965/cannot-import-name-typeguard-from-typing-extensions then it looks like TypeGuard is only in particular versions of typing_extensions.py. So it doesn't look to be available in the version of TypeGuard that is installed.

[DavidMeu]

@amanda11 saw that.

From your stack trace is the sensor that you are trying to use is trying to import that.

Basically it is failing on my black 21.9b0 package which requires "typing_extensions>=3.10.0.0" and st2 3.4.0 has "typing_extensions=3.7.4.3" so I guess I should downgrade my black version to black 21.7b0.

"/opt/stackstorm/virtualenvs/some_pack/lib/python3.6/site-packages/black/handle_ipynb_magics.py", line 15, in from typing_extensions import TypeGuard ImportError: cannot import name 'TypeGuard'

I Just tried the import in the sensor itself for better understanding.