New submission from Christian Iversen <ci(a)sikkerhed.org>:
The documentation for string format options state that both %f, %g and %e default to 6 digits after the decimal point. In fact, %g always seems to use 5 digits by default:
>>> "%g" % 2.1234567
'2.12346'
>>> "%f" % 2.1234567
'2.123457'
>>> "%e" % 2.1234567
'2.123457e+00'
But something much more insidious is wrong, because even when explicitly told how many digits to have, %g is one off:
>>> "%.6g" % 2.1234567
'2.12346'
>>> "%.6f" % 2.1234567
'2.123457'
>>> "%.6e" % 2.1234567
'2.123457e+00'
This can't be right?
----------
assignee: docs@python
components: Documentation
messages: 147940
nosy: Christian.Iversen, docs@python
priority: normal
severity: normal
status: open
title: String format documentation contains error regarding %g
type: behavior
versions: Python 2.6, Python 2.7
_______________________________________
Python tracker <report(a)bugs.python.org>
<http://bugs.python.org/issue13433>
_______________________________________
New submission from Zachary Ware:
>From docs@:
On Thu, Jan 16, 2014 at 2:56 AM, Peter Bröcker <peter.broecker(a)uni-koeln.de> wrote:
> Hi,
>
> I have tried to set up the distutils config files for a custom module
> installation. Using the suggested snippet from
>
> http://docs.python.org/2/install/
>
> [install]
> install-base=$HOME/python
> install-purelib=lib
> install-platlib=lib.$PLAT
> install-scripts=scripts
> install-data=data did not work for me.
>
> Instead, I had to add install-headers and additionally modify all paths
> to include $base:
>
> [install]
> install-base=/some/dir
> install-purelib=$base/lib
> install-platlib=$base/lib.$PLAT
> install-scripts=$base/scripts
> install-headers=$base/include
> install-data=$base/data
>
>
> I'm unsure if this is actually a bug, but I could only resolve this with
> the help of this answer on stackoverflow:
> http://stackoverflow.com/a/12768721
>
> Best regards,
> Peter
----------
assignee: docs@python
components: Distutils, Documentation
messages: 209829
nosy: docs@python, zach.ware
priority: normal
severity: normal
stage: test needed
status: open
title: Update distutils sample config file in Doc/install/index.rst
type: behavior
versions: Python 2.7, Python 3.3, Python 3.4
_______________________________________
Python tracker <report(a)bugs.python.org>
<http://bugs.python.org/issue20464>
_______________________________________
New submission from paul j3:
When there's a conflict involving an argument that was added via 'parents', and the conflict handler is 'resolve', the action in the parent parser may be damaged, rendering that parent unsuitable for further use.
In this example, 2 parents have the same '--config' argument:
parent1 = argparse.ArgumentParser(add_help=False)
parent1.add_argument('--config')
parent2 = argparse.ArgumentParser(add_help=False)
parent2.add_argument('--config')
parser = argparse.ArgumentParser(parents=[parent1,parent2],
conflict_handler='resolve')
The actions of the 3 parsers are (from the ._actions list):
(id, dest, option_strings)
parent1: [(3077384012L, 'config', [])] # empty option_strings
parent2: [(3076863628L, 'config', ['--config'])]
parser: [(3076864428L, 'help', ['-h', '--help']),
(3076863628L, 'config', ['--config'])] # same id
The 'config' Action from 'parent1' is first copied to 'parser' by reference (this is important). When 'config' from 'parent2' is copied, there's a conflict. '_handle_conflict_resolve()' attempts to remove the first Action, so it can add the second. But in the process it ends up deleting the 'option_strings' values from the original action.
So now 'parent1' has an action in its 'optionals' argument group with an empty option_strings list. It would display as an 'optionals' but parse as a 'positionals'. 'parent1' can no longer be safely used as a parent for another (sub)parser, nor used as a parser itself.
The same sort of thing would happen, if, as suggested in the documentation:
"Sometimes (e.g. when using parents_) it may be useful to simply
override any older arguments with the same option string."
In test_argparse.py, 'resolve' is only tested once, with a simple case of two 'add_argument' statements. The 'parents' class tests a couple of cases of conflicting actions (for positionals and optionals), but does nothing with the 'resolve' handler.
------------------------------
Possible fixes:
- change the documentation to warn against reusing such a parent parser
- test the 'resolve' conflict handler more thoroughly
- rewrite this conflict handler so it does not modify the action in the parent
- possibly change the 'parents' mechanism so it does a deep copy of actions.
References:
http://stackoverflow.com/questions/25818651/argparse-conflict-resolver-for-…http://bugs.python.org/issue15271
argparse: repeatedly specifying the same argument ignores the previous ones
http://bugs.python.org/issue19462
Add remove_argument() method to argparse.ArgumentParser
http://bugs.python.org/issue15428
add "Name Collision" section to argparse docs
----------
assignee: docs@python
components: Documentation, Library (Lib), Tests
messages: 226862
nosy: docs@python, paul.j3
priority: normal
severity: normal
status: open
title: argparse: 'resolve' conflict handler damages the actions of the parent parser
type: behavior
versions: Python 3.5
_______________________________________
Python tracker <report(a)bugs.python.org>
<http://bugs.python.org/issue22401>
_______________________________________
New submission from Markus Unterwaditzer:
getpass.getpass doesn't enter a newline when the user aborts input with ^C, while input/raw_input does.
This behavior is surprising and can lead to mis-formatting of subsequent output. However, since this behavior exists since 2.7 and applications may have started to rely on it, I'd add a note to the documentation.
----------
assignee: docs@python
components: Documentation
messages: 247302
nosy: docs@python, untitaker
priority: normal
severity: normal
status: open
title: Document getpass.getpass behavior on ^C
versions: Python 2.7, Python 3.2, Python 3.3, Python 3.4, Python 3.5, Python 3.6
_______________________________________
Python tracker <report(a)bugs.python.org>
<http://bugs.python.org/issue24711>
_______________________________________
New submission from Julian <python_org(a)somethinkodd.com>:
Since Python 2.6, httplib has offered a timeout parameter for fetches. As the documentation explains, if this parameter is not provided, it uses the global default.
What the document doesn't explain is httplib builds on top of the socket library. The socket library has a default timeout of None (i.e. forever). This may be an appropriate default for general sockets, but it is a poor default for httplib; typical http clients would use a timeout in the 2-10 second range.
This problem is propagated up to urllib2, which sits on httplib, and further obscures that the default might be unsuitable.
>From an inspection of the manuals, Python 3.0.1 suffers from the same problem except, the names have changed. urllib.response sits on http.client.
I, for one, made a brutal mistake of assuming that the "global default" would be some reasonable default for fetching web pages; I didn't have any specific timeout in mind, and was happy for the library to take care of it. Several million successful http downloads later, my server application thread froze waiting forever when talking to a recalcitrant web-server. I imagine others have fallen for the same trap.
While an ideal solution would be for httplib and http.client to use a more generally acceptable default, I can see it might be far too late to make such a change without breaking existing applications. Failing that, I would recommend that the documentation for httplib, urllib, urllib2, http.client and urllib.request (+ any other similar libraries sitting on socket? FTP, SMTP?) be changed to highlight that the default global timeout, sans deliberate override, is to wait a surprisingly long time.
----------
assignee: docs@python
components: Documentation, Library (Lib)
messages: 104763
nosy: docs@python, oddthinking
priority: normal
severity: normal
status: open
title: Unexpected default timeout in http-client-related libraries
type: behavior
versions: Python 2.6, Python 2.7, Python 3.1
_______________________________________
Python tracker <report(a)bugs.python.org>
<http://bugs.python.org/issue8595>
_______________________________________
New submission from anatoly techtonik <techtonik(a)gmail.com>:
'naive' and 'aware' are key datetime types - they need a proper definition and anchor for crossrefences. If you take a look at http://docs.python.org/library/datetime.html - the definition of distinction between them is too vague and this seeds of uncertainty grow through the rest of the doc. It is not said how to make non-naive object, how to detect if object of naive or aware. All this stuff is very important for troubleshooting datetims issues in Python projects. It needs a proper documentation.
----------
assignee: docs@python
components: Documentation
messages: 106524
nosy: docs@python, techtonik
priority: normal
severity: normal
status: open
title: datetime naive and aware types should have a well-defined definition that can be cross-referenced
_______________________________________
Python tracker <report(a)bugs.python.org>
<http://bugs.python.org/issue8822>
_______________________________________
New submission from Jake:
In the statistics module documentation, there is a note that states that
"The mean is strongly affected by outliers and is not a robust estimator for central location: the mean is not necessarily a typical example of the data points. For more robust, although less efficient, measures of central location, see median() and mode()"
https://docs.python.org/3/library/statistics.html
While I appreciate the intention, this is quite misleading. The implication is that the mean, median and mode are different ways to estimate one "central location", however, in reality they are very different things (albeit which refer to a similar notion).
The sample mean is an unbiased estimator of the true mean but it need not be unbiased as an estimator of the true median or modes and vice versa for the median and mode.
To make this clearer I would rephrase to
"The mean is strongly affected by outliers and is not necessarily representative of the central tendency of the data. For cases with large outliers or very low sample size, see median() and mode()"
Apologies if this is seen as frivolous, but statistics can be hard enough to remain very clear about even when the words are used precisely.
----------
assignee: docs@python
components: Documentation
messages: 236612
nosy: Journeyman08, docs@python
priority: normal
severity: normal
status: open
title: Misleading note in Statistics module documentation
type: enhancement
versions: Python 3.4
_______________________________________
Python tracker <report(a)bugs.python.org>
<http://bugs.python.org/issue23522>
_______________________________________
New submission from Guy Taylor <thebigguy.co.uk(a)gmail.com>:
The Python docs suggest that io.IOBase.truncate' should take a keyword argument of 'size'.
However this causes a 'TypeError':
TypeError: truncate() takes no keyword arguments
Suggest that the docs are changed to 'truncate(size)' or CPython is changed to allow the keyword.
http://docs.python.org/py3k/library/io.html?highlight=truncate#io.IOBase.tr…http://docs.python.org/library/io.html?highlight=truncate#io.IOBase.truncate
----------
assignee: docs@python
components: Documentation, Interpreter Core
files: test.py
messages: 158308
nosy: TheBiggerGuy, docs@python
priority: normal
severity: normal
status: open
title: TypeError: truncate() takes no keyword arguments
type: behavior
versions: Python 2.7, Python 3.2
Added file: http://bugs.python.org/file25219/test.py
_______________________________________
Python tracker <report(a)bugs.python.org>
<http://bugs.python.org/issue14586>
_______________________________________
New submission from Brett Cannon:
https://docs.python.org/3/extending/extending.html#a-simple-example uses PyModule_Create() instead of PyModuleDef_Init().
----------
assignee: docs@python
components: Documentation
messages: 261398
nosy: brett.cannon, docs@python, eric.snow, ncoghlan
priority: normal
severity: normal
stage: needs patch
status: open
title: Update extending/embedding docs to new way to build modules in C
versions: Python 3.5, Python 3.6
_______________________________________
Python tracker <report(a)bugs.python.org>
<http://bugs.python.org/issue26515>
_______________________________________
New submission from Alex LordThorsen:
Had a friend get stuck on the CSV documentation. They didn't know what a CSV was (to start with) and couldn't find an example that made sense to them. they went to other sources to figure out how to read CSV files in the end.
I made this patch in the hope that starting out with a very minimal example file format followed by an example python read will make landing on the CSV docs easier to follow for new programmers.
----------
assignee: docs@python
components: Documentation
files: csv_documentation.patch
keywords: patch
messages: 260960
nosy: Alex.LordThorsen, docs@python
priority: normal
severity: normal
status: open
title: CSV documentation doesn't open with an example
versions: Python 3.6
Added file: http://bugs.python.org/file42040/csv_documentation.patch
_______________________________________
Python tracker <report(a)bugs.python.org>
<http://bugs.python.org/issue26451>
_______________________________________