Unless you use custom coded input methods to get the password, it will be in many more places then just your immutable string. So don't worry too much.
I finally whent with two solutions. Ld_preload to replace the functionality of the string handling of Python on a lower level. One other option which is a bit easier was to develop my own C library that has more functionality then what Python offers through the standard string handling.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.