[issue35870] readline() specification is unclear
New submission from Victor Porton : In https://docs.python.org/3/library/io.html it is forgotten to say whether '\n' is appened to the return value of readline(). It is also unclear what happens if the last line not terminated by '\n' is read. It is also unclear what is returned if a text file (say with '\r\n' terminators) is read. Is it appended to the return value '\n', '\r\n' or nothing? -- assignee: docs@python components: Documentation messages: 334634 nosy: docs@python, porton priority: normal severity: normal status: open title: readline() specification is unclear versions: Python 3.8 ___ Python tracker <https://bugs.python.org/issue35870> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35530] Counter-intuitive logging API
New submission from Victor Porton :
The following script:
#/usr/bin/env python3
import logging
logger = logging.getLogger(name='main')
logger.setLevel(logging.INFO)
logger.error('XXX')
logging.error('ZZZ')
logger.error('XXX')
outputs
XXX
ERROR:root:ZZZ
ERROR:main:XXX
That is counter-intuitive: two logger.error('XXX') operators should output the
same string, not two different strings "XXX" and "ERROR:main:XXX".
Please discuss how to make Python behave as a user could expect.
--
components: Library (Lib)
messages: 332103
nosy: porton
priority: normal
severity: normal
status: open
title: Counter-intuitive logging API
type: behavior
versions: Python 3.7
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[issue35480] argparse: add a full fledged parser as a subparser
Victor Porton added the comment:
Oh, I noticed I can do
my_subparser = subparsers.add_parser('checkout', aliases=['co'])
So resolution invalid.
--
resolution: -> not a bug
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[issue35442] Chain of several subcommands in argparse
Victor Porton added the comment: One of possible solutions: https://bugs.python.org/issue35480 -- ___ Python tracker <https://bugs.python.org/issue35442> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35480] argparse: add a full fledged parser as a subparser
New submission from Victor Porton :
Subparsers are added like:
subparsers.add_parser('checkout', aliases=['co'])
But I want to use a parser BOTH as a subparser and as a full-fledged parser.
It is because my program should understand both of the following command line
options:
boiler chain -t http://www.w3.org/1999/xhtml -W inverseofsum
and
boiler pipe 'chain -t http://www.w3.org/1999/xhtml -W inverseofsum +
transformation http://example.com/ns1'.
I split it (at +) into several lists of arguments as explained in
https://stackoverflow.com/a/53750697/856090
So I need `chain` both as a subparser and as a standalone parser of `-t
http://www.w3.org/1999/xhtml -W inverseofsum`.
So, feature which I want:
subparsers.add_parser('checkout', aliases=['co'], parser=...)
where ... is a reference to a parser object.
--
components: Library (Lib)
messages: 331730
nosy: porton
priority: normal
severity: normal
status: open
title: argparse: add a full fledged parser as a subparser
type: enhancement
versions: Python 3.7
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[issue9334] argparse: add a full fledged parser as a subparser
Victor Porton added the comment:
Subparsers are added like:
subparsers.add_parser('checkout', aliases=['co'])
But I want to use a parser BOTH as a subparser and as a full-fledged parser.
It is because my program should understand both of the following command line
options:
boiler chain -t http://www.w3.org/1999/xhtml -W inverseofsum
and
boiler pipe 'chain -t http://www.w3.org/1999/xhtml -W inverseofsum +
transformation http://example.com/ns1'.
I split it (at +) into several lists of arguments as explained in
https://stackoverflow.com/a/53750697/856090
So I need `chain` both as a subparser and as a standalone parser of `-t
http://www.w3.org/1999/xhtml -W inverseofsum`.
So, feature which I want:
subparsers.add_parser('checkout', aliases=['co'], parser=...)
where ... is a reference to a parser object.
--
nosy: +porton
title: argparse does not accept options taking arguments beginning with dash
(regression from optparse) -> argparse: add a full fledged parser as a subparser
versions: +Python 3.7 -Python 3.5
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[issue35442] Chain of several subcommands in argparse
New submission from Victor Porton : We should consider some way to implement argparse functionality asked here: https://stackoverflow.com/q/53686523/856090 It is unclear how exactly to do this. This message is a call to discuss what should be the information format and API. The awful thing is that I may need to write my own command line parser, as current argparse seems to be unable to provide this functionality. I think, I will implement this for my program sooner or later but the idea to write my own analogue of argparse somehow terrifies me. -- components: Library (Lib) messages: 331393 nosy: porton priority: normal severity: normal status: open title: Chain of several subcommands in argparse type: enhancement ___ Python tracker <https://bugs.python.org/issue35442> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34306] minidom: wrong processing of xmlns attributes
Victor Porton added the comment: My bug report was wrong: https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html In the DOM, all namespace declaration attributes are by definition bound to the namespace URI: "http://www.w3.org/2000/xmlns/;. These are the attributes whose namespace prefix or qualified name is "xmlns" as introduced in [XML Namespaces 1.1]. -- resolution: -> not a bug stage: -> resolved status: open -> closed type: -> behavior ___ Python tracker <https://bugs.python.org/issue34306> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34458] No way to alternate options
New submission from Victor Porton :
I have:
parser.add_argument('-p', '--preload', help='preload asset', action='append',
metavar='NAMESPACE')
I want also add:
parser.add_argument('-f', '--file', help='preload file', action='append',
metavar='FILE', dest='preload')
This way I could specify -p and/or -f options in any order (like: first -p then
-f then -p again) and store then in 'preload' field in the order which the user
specified the options.
But I have no way to know if an option is -p or -f :-(
Please add something to argparse to solve this problem.
--
components: Library (Lib)
messages: 323857
nosy: porton
priority: normal
severity: normal
status: open
title: No way to alternate options
versions: Python 3.7
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[issue34375] Subtests (unittest)
New submission from Victor Porton :
The following is a fragment of a real code:
~~~
def test_run_xinlude(self):
# stub_stdin(self,
Global.get_resource_bytes("tests/core/data/xml/xinclude.xml"))
for next_script_mode in ['doc1', 'doc2']:
for order in ['breadth', 'depth']:
with capture_stdin_and_stdout():
command_line.main(['-r',
order,
'chain',
Global.get_filename("tests/core/data/xml/xinclude.xml"),
'-u',
'http://portonvictor.org/ns/trans/precedence-include',
'-s',
next_script_mode])
self.assertEqual(sys.stdout.buffer.getvalue(),
TestUtility.XInclude_output,
"for next_script=%s, order=%s" %
(next_script_mode, order))
~~~
I wrote it in one test method instead of four similar methods.
It has the deficiency that if the first test fails, the three remaining tests
are skipped.
I propose to add `subtest` context manager to use it like:
~~~
with subtest():
with capture_stdin_and_stdout():
command_line.main(['-r',
order,
'chain',
Global.get_filename("tests/core/data/xml/xinclude.xml"),
'-u',
'http://portonvictor.org/ns/trans/precedence-include',
'-s',
next_script_mode])
self.assertEqual(sys.stdout.buffer.getvalue(),
TestUtility.XInclude_output,
"for next_script=%s, order=%s" %
(next_script_mode, order))
~~~
which would split our test into four independent tests.
--
components: Library (Lib)
messages: 323375
nosy: porton
priority: normal
severity: normal
status: open
title: Subtests (unittest)
type: enhancement
versions: Python 3.7
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[issue34306] minidom: wrong processing of xmlns attributes
New submission from Victor Porton :
The below script prints
http://www.w3.org/2000/xmlns/
aa:aa
It should print
None
aa:aa
because xmlns:z is NOT an attribute of xmlns namespace.
~~~
import xml.dom.minidom
x = xml.dom.minidom.parseString("")
for i in x.documentElement.attributes.values():
print(i.namespaceURI)
~~~
--
components: XML
messages: 322860
nosy: porton
priority: normal
severity: normal
status: open
title: minidom: wrong processing of xmlns attributes
versions: Python 2.7, Python 3.6, Python 3.7
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[issue34188] Allow dict choices to "transform" values in argpagse
Victor Porton added the comment: @Raymond: "Downstream processing or transformation of inputs is beyond the scope of argparse which should stick to its core responsibilities of argument extraction." You somehow contradict the official documentation: "One particularly effective way of handling sub-commands is to combine the use of the add_subparsers() method with calls to set_defaults() so that each subparser knows which Python function it should execute." The official documentation seems to recommend to pass real Python functions to the parser. So it does do simple "processing or transformation of inputs" which you recommend against. -- ___ Python tracker <https://bugs.python.org/issue34188> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34191] argparse: Missing subparser error message should be more clear
New submission from Victor Porton :
argparse produces a long unreadable, non-understandable for non-programmers
error message when a subparser is not specified in the command line.
Note that the below message contains Ubuntu specifics, but it seems it would be
nearly as unclear on other OSes too.
The worst thing about this error message is that to produce something readable
instead I need to somehow parse the command string (or at least to catch
TypeError).
$ python3.7 test.py
Traceback (most recent call last):
File "test.py", line 10, in
args = parser.parse_args()
File "/usr/lib/python3.7/argparse.py", line 1754, in parse_args
args, argv = self.parse_known_args(args, namespace)
File "/usr/lib/python3.7/argparse.py", line 1786, in parse_known_args
namespace, args = self._parse_known_args(args, namespace)
File "/usr/lib/python3.7/argparse.py", line 2021, in _parse_known_args
', '.join(required_actions))
TypeError: sequence item 0: expected str instance, NoneType found
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in
apport_excepthook
from apport.fileutils import likely_packaged, get_recent_crashes
File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in
from apport.report import Report
File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in
import apport.fileutils
File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in
from apport.packaging_impl import impl as packaging
File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in
import apt
File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in
import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'
Original exception was:
Traceback (most recent call last):
File "test.py", line 10, in
args = parser.parse_args()
File "/usr/lib/python3.7/argparse.py", line 1754, in parse_args
args, argv = self.parse_known_args(args, namespace)
File "/usr/lib/python3.7/argparse.py", line 1786, in parse_known_args
namespace, args = self._parse_known_args(args, namespace)
File "/usr/lib/python3.7/argparse.py", line 2021, in _parse_known_args
', '.join(required_actions))
TypeError: sequence item 0: expected str instance, NoneType found
The script follows.
#!/usr/bin/env python
import argparse
parser = argparse.ArgumentParser(description="Automatically process XML")
subparsers = parser.add_subparsers(title='subcommands')
chain_parser = subparsers.add_parser('chain', aliases=['c'],
help='Automatically run a chain of transformations')
args = parser.parse_args()
--
components: Library (Lib)
messages: 322164
nosy: porton
priority: normal
severity: normal
status: open
title: argparse: Missing subparser error message should be more clear
type: behavior
versions: Python 3.7
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[issue34188] Use dicts to "transform" argparse arguments to values
New submission from Victor Porton :
The below code produces "rock", but it should produce "a". This (to use dict
value instead of the key by argparse result) is both to be a new useful feature
(for example to map strings in a command line to certain functions or classes
provided as dict values) and conform to intuition better.
My feature proposal breaks backward compatibility, but I think no reasonable
programmer wrote it in such a way that he relied on the current behavior for
`dict` values for `choices`.
import argparse
parser = argparse.ArgumentParser(prog='game.py')
parser.add_argument('move', choices={'rock':'a', 'paper':'b', 'scissors':'c'})
print(parser.parse_args(['rock']))
--
components: Library (Lib)
messages: 322142
nosy: porton
priority: normal
severity: normal
status: open
title: Use dicts to "transform" argparse arguments to values
versions: Python 3.7
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[issue34188] Use dicts to "transform" argparse arguments to values
Change by Victor Porton : -- type: -> behavior ___ Python tracker <https://bugs.python.org/issue34188> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34180] bool(Q) always return True for a priority queue Q
New submission from Victor Porton : It seems that bool(Q) always return True for a priority queue Q. It should behave the same way as for bool(L) where L is a list, that is return False on an empty queue. Please check also other objects in https://docs.python.org/3/library/queue.html After the bug is fixed, the documentation should be clear that there was a change in the behavior in certain Python version. -- components: Library (Lib) messages: 322103 nosy: porton priority: normal severity: normal status: open title: bool(Q) always return True for a priority queue Q type: behavior versions: Python 3.7 ___ Python tracker <https://bugs.python.org/issue34180> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue33343] Subcommand abbreviations
New submission from Victor Porton <por...@narod.ru>:
https://docs.python.org/3/library/argparse.html does not allow abbreviations
for subparsers ("subcommands").
It seems inconsistent that long options can be abbreviated but subcommands
cannot.
Either implement subcommand abbreviations or explain in the docs why there is
none.
--
components: Library (Lib)
messages: 315671
nosy: porton
priority: normal
severity: normal
status: open
title: Subcommand abbreviations
type: enhancement
versions: Python 3.6
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[issue32875] Add __exit__() method to event loops
New submission from Victor Porton <por...@narod.ru>: Please add `__exit__()` method to event loops, to use them with `with`. -- components: asyncio messages: 312360 nosy: asvetlov, porton, yselivanov priority: normal severity: normal status: open title: Add __exit__() method to event loops type: enhancement versions: Python 3.6 ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue32875> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue32871] Interrupt .communicate() on SIGTERM/INT
New submission from Victor Porton <por...@narod.ru>: At https://docs.python.org/3/library/subprocess.html there is said nothing about what happens if our Python program terminates (by SIGTERM or SIGINT) while waiting for .communicate(). I assume to do something in this situation is just forgotten. Usually terminate of our program should also terminate the invoked script. It can be made by re-delivery SIGTERM/SIGINT or (on non-POSIX) by .terminate() method. Probably, it should be done by .terminate() method even on POSIX systems, to handle SIGTERM and SIGINT in the same way. -- components: Library (Lib) messages: 312328 nosy: porton priority: normal severity: normal status: open title: Interrupt .communicate() on SIGTERM/INT type: behavior versions: Python 3.6 ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue32871> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue28825] socket.SO_KEEPALIVE does not work on FreeBSD
Victor Porton added the comment: Weird, after I minimized the PHP example, it also has the same bug as the Python one. (The real long code in PHP was working without this bug.) I attach the PHP code for your reference. Maybe it is a FreeBSD bug? Please write to por...@narod.ru with advice how to make the server not to disconnect after 5 minutes of idle connection. -- Added file: http://bugs.python.org/file45678/bug.php ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue28825> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue28825] socket.SO_KEEPALIVE does not work on FreeBSD
New submission from Victor Porton: When I connect telnet XXX 9000 to the server in attached file, the connection breaks after 5 min (and a few seconds), as if SO_KEEPALIVE were not specified. I run my server on FreeBSD 9.2-RELEASE-p15 (GENERIC) So SO_KEEPALIVE does not work in Python 2.7 and 3.5 on FreeBSD. Specifically, I need my TCP connection not to break in extended periods of time and cannot do this with Python. It seems that similar code does work with PHP (I am going to write a short PHP example), so it is likely a Python bug, not FreeBSD bug. -- components: FreeBSD, IO, Library (Lib) files: bug.py messages: 281911 nosy: koobs, porton priority: normal severity: normal status: open title: socket.SO_KEEPALIVE does not work on FreeBSD type: behavior versions: Python 2.7, Python 3.5 Added file: http://bugs.python.org/file45677/bug.py ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue28825> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
