Adds qt-like signals to Parameters

[MarcusZuber]

I was looking for an elegant way to connect different Parameterizable-Parameters and had this idea.

This uses https://github.com/nexconnectio/pynnex which implements qt-like signals and slots and is quite light-weight. Currently, the development is quite active and looks clean.

Example:

from concert.devices.cameras.dummy import Camera
camera = await Camera()

def print_value(val):
   print(value)

camera['exposure_time'].value_set.connect(print_value)


camera.exposure = 1*q.s

One motivation for this would be to couple experiment parameters with addon-parameters (the number of the online-reco couples with the num_projections of the CT experiment).

TODO:

• Tests
• Doc

[codecov]

Codecov Report

Attention: Patch coverage is 73.91304% with 6 lines in your changes missing coverage. Please review.

Project coverage is 82.83%. Comparing base (2eb3060) to head (7926fe0).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
concert/base.py	73.91%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #548      +/-   ##
==========================================
- Coverage   82.85%   82.83%   -0.02%     
==========================================
  Files         133      133              
  Lines       10928    10951      +23     
==========================================
+ Hits         9054     9071      +17     
- Misses       1874     1880       +6     

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[MarcusZuber]

Works only with python3.10+. 3.9 will be EOL this October. I don't think we will do a new realease before...

[tfarago]

Doesn't psutil work only on linux? I get the motivation but the concrete cases you mentioned could be also handled without signals, or? Let's discuss this Friday in the meeting.

[MarcusZuber]

I did' t add psutil here... Sure, lets discuss it on Friday.