[Python] asizeof appears to be inaccurate

Take this MWE:

from pympler import asizeof
from random import randint, choice
from string import printable
from heapq import heappush
ascii = printable[:-5]
pq = []
for _ in range(10000000):
heappush(pq, (randint(0, 31), randint(0, 31), randint(0, 31), ''.join(choice(ascii) for _ in range(16)))
print(asizeof.asizeof(pq))


I can see from running 'top' that this takes about 2.6GB of RAM. But asizeof reports 1,449,096,184 bytes which is a long way off.

Am I using it wrong?

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