[New-bugs-announce] [issue9013] Implement tzinfo.dst() method in timezone

Alexander Belopolsky report at bugs.python.org
Wed Jun 16 19:58:31 CEST 2010

New submission from Alexander Belopolsky <belopolsky at users.sourceforge.net>:

This idea was brought in the original fixed offset timezone proposal (see issue 5094), but was met with some opposition.  See msg106914, point 2. As a result, the timezone implementation is in conflict with tzinfo documentation that says "If utcoffset() does not return None, dst() should not return None either." http://docs.python.org/dev/py3k/library/datetime.html#datetime.tzinfo.utcoffset

Note that dst() is not needed for time calculations involving fixed offset timezones because DST shift is included in utcoffset().  It is however needed for interoperability with timetuple time representation. See issue9004.

If the long term goal is to move users from using timetuples to to datetime objects, it is important for time objects to be able to store DST flag.

assignee: belopolsky
components: Extension Modules
messages: 107940
nosy: belopolsky
priority: normal
severity: normal
stage: unit test needed
status: open
title: Implement tzinfo.dst() method in timezone
type: feature request
versions: Python 3.2

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