[Python-Dev] Decision of having a deprecation period or not for changing csv.DictReader returning type. (original) (raw)

Guido van Rossum guido at python.org
Sun Dec 17 10:46:45 EST 2017

My gut suggests me not to do this (neither here nor in other similar cases). I doubt there's much of a performance benefit anyway.

On Sat, Dec 16, 2017 at 10:04 PM, 尚辉 <shangdahao at gmail.com> wrote:

Hi, guys

In https://github.com/python/cpython/pull/4904, I made csv.DictReader returning regular dict instead of OrderedDict. But this code could break existing code that relied on methods like movetoend() which are present in OrderedDict() but not in dict(). As rhettinger suggested, such code is either unlikely or rare, so it would be net less disruptive for users to just go forward with this patch. So, would we just go forward with this patch or having a deprecation period before this patch? Any help is big thanks. --

Best Regards . shangdahao

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