Copying objects

Two names referencing the same mutable object. Pointers, references, and how things are different in C++


Why list (mutable) cannot be a dict key


thread (see Sion Arrowsmith reply)


d = {}

k = 1, 2

dk = None


Now, if I were to do:




what would you expect:




Optimizing Python code for speed

thread scramble 20MB file: from 70 sec to 2.8 sec