Home Original page

[Python-Dev] RFC: PEP 509: Add a private version to dict

Victor Stinner victor.stinner at gmail.com
Fri Apr 15 17:19:10 EDT 2016 
2016-04-15 23:07 GMT+02:00 Random832 <random832 at fastmail.com>:
> Why is iterating over items different from iterating over keys?
>
> in other words, why do I have to write:
>
> for k in dict:
>     v = dict[k]
>     ...do some stuff...
>     dict[k] = something
>
> rather than
>
> for k, v in dict.items():
>     ...do some stuff...
>     dict[k] = something
>
> It's not clear why the latter is something you want to prevent.

Hum, I think that you misunderstood what should be prevented. Please
see https://bugs.python.org/issue19332

Sorry, I don't know well this issue. I just know that sadly the PEP
509 doesn't help to fix this issue. Maybe it's not worth to mention
it...

Victor
More information about the Python-Dev mailing list