On Tue, 08 Oct 2013 22:02:43 +0400, Yuriy Taraday <yorik.sar at gmail.com> wrote: > There should be a way to avoid creation of the second dict when there is no > need to store original keys. For example, email.message module doesn't > store original headers as they are not needed. The same applies to web > frameworks parsing HTTP headers or WSGI environment. This is not true. email.message *very carefully* preserves the original header name, case and all [*], that's part of its mandate (faithfully reproducing the original parsed message). That said, email.message can't use transformdict, since email.message needs a list-with-case-insensitive-keyed-lookup, not a dict, because it also preserves the original *order* of the headers. And it couldn't use an orderedtransformdict, either, since it also has to preserve *duplicate* headers. --David [*] currently it loses whitespace information in certain cases, but the new header parser/folder is supposed to fix that...or will once I fix a few more corner cases :)
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