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Run the following script with Python 3.6.0rc1:
 class O:
 pass
 o = O()
 for n in range(20):
 print(n)
 o.x = 42
 o.__dict__.pop('x', None)
You can observe the memory usage of the Python process growing exponentially.
E.g. in bash:
 ulimit -v 1000000 # don't push other processes into swap please
 python3.6 break.py
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 Traceback (most recent call last):
 File "break.py", line 7, in <module>
 o.x = 42
 MemoryError