Ammar Askar <am...@ammaraskar.com> added the comment:

Modifying containers while iterating over them is generally not safe. In this 
case the iterator at the point you start the loop will contain all the items to 
iterate over, adding them mid-loop will not cause them to be iterated over.

Take a look at the last section here for suggestions: 
https://docs.python.org/3/tutorial/datastructures.html#looping-techniques

----------
nosy: +ammar2
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35023>
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