delta/cpython-git.git/Lib/argparse.py, branch v3.8.5

[3.8] bpo-39546: argparse: Honor allow_abbrev=False for specified prefix_chars (GH-18337) (GH-18543)

2020-02-18T11:14:07+00:00

When `allow_abbrev` was first added, disabling the abbreviation of
long options broke the grouping of short flags ([bpo-26967](https://bugs.python.org/issue26967)).  As a fix,
b1e4d1b603 (contained in v3.8) ignores `allow_abbrev=False` for a
given argument string if the string does _not_ start with "--"
(i.e. it doesn't look like a long option).

This fix, however, doesn't take into account that long options can
start with alternative characters specified via `prefix_chars`,
introducing a regression: `allow_abbrev=False` has no effect on long
options that start with an alternative prefix character.

The most minimal fix would be to replace the "starts with --" check
with a "starts with two prefix_chars characters".  But
`_get_option_tuples` already distinguishes between long and short
options, so let's instead piggyback off of that check by moving the
`allow_abbrev` condition into `_get_option_tuples`.





https://bugs.python.org/issue39546
(cherry picked from commit 8edfc47baec7ff4cb1b9db83dd35c8ffc1d498a4)


Co-authored-by: Kyle Meyer 


https://bugs.python.org/issue39546



Automerge-Triggered-By: @encukou

bpo-38821: Fix crash in argparse when using gettext (GH-17192)

2019-11-20T13:48:25+00:00

(cherry picked from commit be5c79e0338005d675a64ba6e5b137e850d556d1)

Co-authored-by: Federico Bond

bpo-37785: Fix xgettext warning in argparse (GH-15161)

2019-09-13T09:45:27+00:00

(cherry picked from commit 42671aea2db6cbc54369617da0fd3545048e0a45)

Co-authored-by: Jakub Kulík

[3.8] bpo-29553: Fix ArgumentParser.format_usage() for mutually exclusive groups (GH-14976) (GH-15494) (GH-15624)

2019-08-30T22:25:38+00:00

Steven Bethard designated a new maintainer for argparse (GH-15605) (GH-15606)

2019-08-30T04:27:33+00:00

(cherry picked from commit 496058f59937da478eb172c864502b5dcf67705b)

Co-authored-by: Raymond Hettinger

bpo-16970: Adding error message for invalid args (GH-14844)

2019-08-02T05:16:44+00:00

BPO -16970: Adding error message for invalid args

Applied the patch argparse-v2 patch issue 16970, ran patch check and the test suite, test_argparse with 0 errors

https://bugs.python.org/issue16970
(cherry picked from commit 4b3e97592376d5f8a3b75192b399a2da1be642cb)

Co-authored-by: tmblweed

bpo-26967: fix flag grouping with allow_abbrev=False (GH-14316) (GH-14759)

2019-07-14T05:59:56+00:00

The `allow_abbrev` option for ArgumentParser is documented and intended to disable support for unique prefixes of --options, which may sometimes be ambiguous due to deferred parsing.

However, the initial implementation also broke parsing of grouped short flags, such as `-ab` meaning `-a -b` (or `-a=b`).  Checking the argument for a leading `--` before rejecting it fixes this.

This was prompted by pytest-dev/pytestGH-5469, so a backport to at least 3.8 would be great :smile:
And this is my first PR to CPython, so please let me know if I've missed anything!

https://bugs.python.org/issue26967
(cherry picked from commit dffca9e925ee5c3072663cbe8d4d4768406d5307)

Co-authored-by: Zac Hatfield-Dodds

bpo-37150: Throw ValueError if FileType class object was passed in add_argument (GH-13805)

2019-06-07T21:11:59+00:00

There is a possibility that someone (like me) accidentally will omit parentheses with `FileType` arguments after `FileType`, and parser will contain wrong file until someone will try to use it.

Example:
```python
parser = argparse.ArgumentParser()
parser.add_argument('-x', type=argparse.FileType)
```

https://bugs.python.org/issue37150
(cherry picked from commit 03d5831a2d62c68654ec223168e574cd546efbf6)

Co-authored-by: zygocephalus

bpo-23378: Add an extend action to argparse (GH-13305)

2019-05-21T17:47:42+00:00

Add an extend action to argparse


https://bugs.python.org/issue23378

Remove superseded line from argparse.HelpFormatter() (GH-8839)

2018-08-22T20:14:14+00:00