[issue23884] New DateType for argparse (like FileType but for dates)
Peter Marsh added the comment: The consensus seems to be that this is simple enough for people to implement themselves (if they need it) and it's probably not worth adding to argparse, so I've closed this :) -- resolution: - rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue23884 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue23884] New DateType for argparse (like FileType but for dates)
New submission from Peter Marsh:
Hello,
Reasonably frequently I find myself needing to pass a date as a command line
argument to a Python script I've written. Currently, argparse does not have a
built support for dates - this adds a new class to argparse (much like the
existing FileType) that parses arguments to datetime.date instances.
Example:
parser = argparse.ArgumentParser()
parser.add_argument('--start', type=argparse.DateType('%d/%m/%Y))
parser.add_argument('end', type=argparse.DateType())
parser.parse_args(['--start', '01/02/2015', '2015-01-03'])
Namespace(end=datetime.date(2015, 1, 3), start=datetime.date(2015, 1, 2))
I think this would be a useful addition to the standard library, a quick Google
shows that many people roll their own version of this anyway.
Support for datetime.datetime and perhaps even datetime.timedeltas might be
good too, but date/times get a bit more complicated (timezones in general and
varying support for the '%z' format string which is required to default to an
ISO8601 date time).
Cheers,
Pete
--
components: Library (Lib)
files: argparse_datetype.patch
keywords: patch
messages: 240220
nosy: petedmarsh
priority: normal
severity: normal
status: open
title: New DateType for argparse (like FileType but for dates)
type: enhancement
versions: Python 3.5
Added file: http://bugs.python.org/file38859/argparse_datetype.patch
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[issue23884] New DateType for argparse (like FileType but for dates)
Changes by SilentGhost ghost@gmail.com: -- nosy: +bethard ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue23884 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue23884] New DateType for argparse (like FileType but for dates)
Changes by Mark Lawrence breamore...@yahoo.co.uk: -- nosy: +paul.j3 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue23884 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue23884] New DateType for argparse (like FileType but for dates)
paul j3 added the comment: It's a possible addition, but I don't have sense of the demand for it. I wonder, what does the class offer that a function like this doesn't? def adate(date_string): return datetime.datetime.strptime(date_string,'%Y-%m-%d').date() I'd be hesitant to add FileType if wasn't already present. It hasn't aged very well. We've had bug issues related to v3 binary files, and contexts. The main feature that FileType (beyond verifying that the file actually does exist) adds is the recognition of '-' as stdin/out. By analogy I'm lukewarm about adding a DateType class. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue23884 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue23884] New DateType for argparse (like FileType but for dates)
R. David Murray added the comment: Yes, I think this is a case where it is better for the application to define exactly what it needs rather than try to define a general solution that won't satisfy everyone :) FileType's purpose is actually, I think, to give you an *open* file. Which is also where a number of the problems came from :) -- nosy: +r.david.murray ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue23884 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue23884] New DateType for argparse (like FileType but for dates)
paul j3 added the comment: Examples of datetime types from Stackoverflow: http://stackoverflow.com/questions/21437258/defining-python-argparse-arguments The suggested answer (but not accepted) is 'type=lambda s: datetime.datetime.strptime(s, '%Y-%m-%d')' another http://stackoverflow.com/questions/12462074/python-argparse-create-timedelta-object-from-argument which references https://gist.github.com/jnothman/4057689 'timedeltatype.py: An argparse type factory that produces datetime.timedelta objects' and http://stackoverflow.com/questions/25470844/specify-format-for-input-arguments-argparse-python with a type function -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue23884 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
