i want to change my progrssbar color to Black which is green. i think by default it is green
I am trying with 
self.progress_bar.color 
but doesnot reflect any change i think there will be any inbuilt method but i am unable to find it.
I'm guessing here, but because wxPython wraps native widgets whenever possible, those widgets may or may not support the changing of certain colors. I know that's true with StaticText on some OSes. So you may want to try with the generic progress bar, PyProgress, since it's written in pure Python and can be hacked easily.
Want to change progress bar color to Black in wx python