The python-control package does not require sympy and pandas is optional (it will use it if it is on the system, but runs fine without it), but the others are pretty integral to the operation of the package.

Another package for control system analysis isharold, but it also requires numpy, scipy, and matplot lib.

@CesMak could you check on how much time each of these packages takes to load/compile?

If, as I suspect, matplotlib is a significant fraction, then that supports a move to separate out those parts of the library that require it (into for examplebode_plot andstep_plot type functions)

@murrayrm You are correct sry ma listening above is incorrect it was forhttps://pypi.org/project/control-toolbox/.
The libs loaded are currently:

I had a look at harold already and I do not like it - control is a much better lib in many ways.

@sawyerbfuller In that case I have to modify the current lib to my needs which means some effort.

So I guess theshort answer is: There is no leightweight / fast version of python-control as of now.