I noticed a few tab characters in some python script files.

Files with tab characters:

• external/controls.py (970)
• control/phaseplot.py (294)
• control/phaseplot_test.py (49)

Also, semi-colons are still in use or left-over from Matlab code:

• genswitch.py
• statefbk.py
• config.py
• frdata.py
• phaseplot_test.py
• bdalg.py
• yottalab.py
• matlab_test.py

I don't think they affect execution but it's not good practice to have tab characters in python scripts.