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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