Nested loop limit?

[Nelson Minar]

Why does CPython have a limit of 21 nested blocks?

I'm never going to write code this deeply nested by hand, but I could
imagine writing a program that does. It's also sort of a weird limit.

Peter Hansen <peter at engcorp.com> writes:
>  >>> for n in range(100):
> ...   exec '\n'.join([(' ' * i) + 'for i%s in range(2):' % i for i in
> range(n)])
>   + '\n' + ' ' * n + 'pass\n'
> ...
> Traceback (most recent call last):
>    File "<stdin>", line 2, in ?
> SystemError: too many statically nested blocks
>  >>> print n
> 21
> 
> Yes. :-)
> 
> -Peter

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