da-dada <georg.klingenb...@travedsl.de> added the comment:

I have no problem of making my programme run properly (asking first if in dict 
etc), but I just read the docu of dict.setdefault

setdefault(key[, default]) 
If key is in the dictionary, return its value. If not, insert key with a value 
of default and return default. default defaults to None.

and it clearly reads if the key is.. return its value, with a full stop;
so either the docu is wrong (but proposes exactly the needed shortcut) or 
python is as it is: come in & find out

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38998>
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