I think it could be possible to change the exposure value via python but I did not find with the proper way to do so, is there a way to change that value on a source via python?
Of course I can use the short key “e” and setting the exposure there but I want to do that via python.
Finally I found it, I had just to get the correct property, in this case #RVColor.color.exposure so for setting the exposure I have only to set the correct value via
import rv
rv.commands.setFloatProperty('#RVColor.color.exposure', [0.5, 0.5, 0.5], True) # sets exposure to 0.5 in all three channels RGB