Serhiy Storchaka added the comment:

Some examples (with issue19858 for protocol 4 optimization).

Unpatched:

>>> len(pickle.dumps([P(12, 34) for i in range(1000)], 3))
17258
>>> len(pickletools.optimize(pickle.dumps([P(12, 34) for i in range(1000)], 3)))
8018
>>> len(pickle.dumps([P(i, -i) for i in range(1000)], 3))
20999
>>> len(pickletools.optimize(pickle.dumps([P(i, -i) for i in range(1000)], 3)))
11759

>>> len(pickle.dumps([P(12, 34) for i in range(1000)], 4))
12031
>>> len(pickletools.optimize(pickle.dumps([P(12, 34) for i in range(1000)], 4)))
9028
>>> len(pickle.dumps([P(i, -i) for i in range(1000)], 4))
15772
>>> len(pickletools.optimize(pickle.dumps([P(i, -i) for i in range(1000)], 4)))
12769

Patched:

>>> len(pickle.dumps([P(12, 34) for i in range(1000)], 4))
10031
>>> len(pickletools.optimize(pickle.dumps([P(12, 34) for i in range(1000)], 4)))
8028
>>> len(pickle.dumps([P(i, -i) for i in range(1000)], 4))
13772
>>> len(pickletools.optimize(pickle.dumps([P(i, -i) for i in range(1000)], 4)))
11769

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22783>
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