New submission from Serhiy Storchaka:

Gzip files can contains an extra field and some applications use this for 
extending gzip format. The current GzipFile implementation ignores this field 
on input and doesn't allow to create a new file with an extra field.

I propose to save an extra field data on reading as a GzipFile attribute and 
add new parameter for GzipFile constructor for creating new file with an extra 
field.

----------
components: Library (Lib)
messages: 186423
nosy: serhiy.storchaka
priority: normal
severity: normal
stage: needs patch
status: open
title: Work with an extra field of gzip files
type: enhancement
versions: Python 3.4

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17681>
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