This is a very simple tool to invert HEX colors.
Just dowload color_inverter.py and run:
$ python3 color_inverter.py
You need to provide one or more colors without "#" as argument for -c
option. For example:
$ ./color_inverter.py -c aaaaaa bbbbbb
>>> from color_inverter import invert
>>> c = invert('ffffff')
>>> print(c)
000000