[Python-Dev] Making sure dictionary adds/deletes during iteration always raise exception (original) (raw)
Serhiy Storchaka storchaka at gmail.com
Tue Dec 13 18:02:50 EST 2016
- Previous message (by thread): [Python-Dev] Making sure dictionary adds/deletes during iteration always raise exception
- Next message (by thread): [Python-Dev] Making sure dictionary adds/deletes during iteration always raise exception
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
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
- Previous message (by thread): [Python-Dev] Making sure dictionary adds/deletes during iteration always raise exception
- Next message (by thread): [Python-Dev] Making sure dictionary adds/deletes during iteration always raise exception
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]