I understand that in Python a string is simply an expression and a string by itself would be garbage collected immediately upon return of control to a code's caller, but...

1. Large class/method doc strings in your code: do they waste memory by building the string objects up?
2. Module level doc strings: are they stored infinitely by the interpreter?

Does this even matter? My only concern came from the idea that if I'm using a large framework like Django, or multiple large open source libraries, they tend to be very well documented with potentially multiple megabytes of text. In these cases are the doc strings loaded into memory for code that's used along the way, and then kept there, or is it collected immediately like normal strings?