Chaitanya Baweja
Oct 12, 2019 · 1 min read

I do feel that getsizeof() is not extremely straightforward as it should be.

But, you are wrong on one aspect. It does give different values for different dictionaries.

The memory taken by a dictionary is dependent upon the number of (key,value) pairs it needs to store. Python initially keeps enough memory for 5 (key, value) pairs. But, when you need the 6th pair, more memory is acquired.

Try executing the following:

import sys, itertools
>>> sys.getsizeof(dict(zip(range(1), itertools.cycle([1]))))
280
>>> sys.getsizeof(dict(zip(range(5), itertools.cycle([1]))))
280
>>> sys.getsizeof(dict(zip(range(6), itertools.cycle([1]))))
1048

You can find more info on this : here

    Chaitanya Baweja

    Written by

    Machine Learning Engineer | Python | Data Analytics | Economics | Physics

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