pickling memory works appropriately, keeping references in-tact

test_pickle.py

# pickling memory works appropriately, keeping references in-tact
import pickle

heap = ['original']
to_pickle = {'one': heap, 'two': heap}

s = pickle.dumps(to_pickle)
from_pickle = pickle.loads(s)

from_pickle['one'][0] = 'changed'
# outputs 'changed should be "changed"'
print(from_pickle['two'][0], 'should be "changed"')