On 13.12.16 11:51, Max Moroz wrote:
Would it be worth ensuring that an exception is ALWAYS raised if a key
is added to or deleted from a dictionary during iteration?
Currently, dict.__iter__ only raises "RuntimeError" when "dictionary
changed size during iteration". I managed to add 1 key and delete 1
key from the dictionary in the same iteration of the loop (the code
was in a callback function invoked in the loop) - of course without
any exception. (I hope I'm right in assuming that adding and deleting
entries in the loop is unsafe whether or not number of adds equals
number of deletes.)
I suspect the cost of a more comprehensive error reporting is not
worth the benefit, but I thought I'd ask anyway.
The patch implementing this was rejected.
http://bugs.python.org/issue19332
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