Problem with "while and a string of characters

[ineedastupidusername]

I hardly looked at it and already strongly suspect it's this annoying "list parameters are references to external list not unique copies, so editing a list in a function will edit the external list as well". So you have to do this retarded workaround:

import copy #top of script
#then at function, deepcopy the lists so they are unique not references
def faceblanche90(REFligne1,REFligne2,REFligne3):
    ligne1=copy.deepcopy(REFligne1)
    ligne2=copy.deepcopy(REFligne2)
    ligne3=copy.deepcopy(REFligne3)

lemme know if that was the problem, its such a common snag I bet it was