[docs] [issue26545] os.walk is limited by python's recursion limit

[Sergey Chvalyuk]

Sergey Chvalyuk added the comment:

There is another limitation with os.walk
it also cannot go very deep inside tree because of scandir can throw 
OSError(36, 'File name too long')

I have wrote tests for both cases:

https://gist.github.com/grubberr/3367f1d605e292103b576a17a46ef3c3

tested on linux only

on MacOS it throw 'File name too long' for 1-st test too
set sys.settrecursionlimit to lower values

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nosy: +Sergey Chvalyuk

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<http://bugs.python.org/issue26545>
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