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:

k.append(3)

what would you expect:

d.keys()

Optimizing Python code for speed

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

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