$ ./run.sh
Running virtualenv with interpreter /Library/Frameworks/Python.framework/Versions/2.7/bin/python
New python executable in /Users/vkuznetsov/Documents/prog/tmp/test-slots/env/bin/python
Installing setuptools, pip, wheel...done.
Collecting memory-profiler
Collecting psutil
Installing collected packages: memory-profiler, psutil
Successfully installed memory-profiler-0.41 psutil-4.1.0

Running tests with python

Profiling with slots:
Filename: slots.py

Line #    Mem usage    Increment   Line Contents
================================================
    27      9.7 MiB      0.0 MiB   @profile
    28                             def test(cls):
    29     24.9 MiB     15.2 MiB       return [cls(n) for n in range(100000)]


Profiling without slots (normal classes with __dict__):
Filename: slots.py

Line #    Mem usage    Increment   Line Contents
================================================
    27      9.8 MiB      0.0 MiB   @profile
    28                             def test(cls):
    29     52.7 MiB     42.8 MiB       return [cls(n) for n in range(100000)]

$ ./run.sh python3