A question regarding string instance uniqueness in python

Question

I was trying to figure out which integers python only instantiates once (-6 to 256 it seems), and in the process stumbled on some string behaviour I can\'t see the pattern i

Answer 1

Python is allowed to inline string constants; A,B,C,D are actually the same literals (if Python sees a constant expression, it treats it as a constant).

str is actually a class, so str(whatever) is calling this class' constructor, which should yield a fresh object. This explains E,F,G (note that each of these has separate identity).

As for H, I am not sure, but I'd go for explanation that this expression is too complicated for Python to figure out it's actually a constant, so it computes a new string.