Changes by Giacomo Alzetta giacomo.alze...@gmail.com:
--
assignee: - docs@python
components: +Documentation
nosy: +docs@python
type: - enhancement
versions: +Python 2.7
___
Python tracker rep...@bugs.python.org
http://bugs.python.org/issue23850
New submission from Giacomo Alzetta:
Python2.7 documentation is missing critical information regarding the
backporting of the new-buffer protocol.
There is no mention whatsoever of the Py_TPFLAGS_HAVE_NEWBUFFER flag which is
required to implement it. The only way to discover it is by reading
New submission from Giacomo Alzetta:
The documentation for hashable in the glossary
(https://docs.python.org/3.4/reference/datamodel.html#object.__hash__) is
incorrect:
they all compare unequal (except with themselves), **and their hash value is
their id().**
It is *not* true
Giacomo Alzetta added the comment:
their hash value is their id() seems quite clearly stating that:
class A: pass
...
a = A()
hash(a) == id(a)
should be true, but:
hash(a) == id(a)
False
(both in python2 and in python3)
The python 2 documentation for the __hash__ special method *does
Giacomo Alzetta added the comment:
I asked this because, for example, in Haskell it *is* a well-defined behaviour
(see its documentation at:
http://hackage.haskell.org/package/containers-0.5.4.0/docs/Data-Set.html): the
left operand is preferred by all operations.
In fact, working
New submission from Giacomo Alzetta:
Currently the documentation for set (at:
http://docs.python.org/2/library/stdtypes.html#set) does not mention which
operand is preferred when performing the usual binary operations.
For example the following sample code doesn't have a defined result
Giacomo Alzetta added the comment:
Note that the documentation for formatting with %, found here:
http://docs.python.org/2/library/stdtypes.html#string-formatting-operations,
states:
If format requires a single argument, values may be a single non-tuple object.
[5] Otherwise, values must
Giacomo Alzetta added the comment:
I can reproduce a similar behaviour, but instead of negative values I obtain
huge values(which may as well be a negative unsigned converted to a python
int).
See this stackoverflow question:
http://stackoverflow.com/questions/15934950/python-file-tell
Giacomo Alzetta added the comment:
The documentation for python 3.3.1 states, at
http://docs.python.org/3/tutorial/inputoutput.html#reading-and-writing-files,
states:
f.tell() returns an integer giving the file object’s current position in
the file, **measured in bytes from the beginning
Giacomo Alzetta added the comment:
I can't find any mention of this behaviour in python3's documentation, nor any
reference to ftell(). Is it only well hidden or was it deleted by accident?
--
nosy: +bakuriu
status: pending - open
___
Python tracker
Il giorno giovedì 22 novembre 2012 09:44:21 UTC+1, Steven D'Aprano ha scritto:
On Wed, 21 Nov 2012 23:01:47 -0800, Giacomo Alzetta wrote:
Il giorno giovedì 22 novembre 2012 05:00:39 UTC+1, MRAB ha scritto:
On 2012-11-22 03:41, Terry Reedy wrote: It can't return 5 because 5
isn't
I just came across this:
'spam'.find('', 5)
-1
Now, reading find's documentation:
print(str.find.__doc__)
S.find(sub [,start [,end]]) - int
Return the lowest index in S where substring sub is found,
such that sub is contained within S[start:end]. Optional
arguments start and end are
Il giorno mercoledì 21 novembre 2012 20:25:10 UTC+1, Hans Mulder ha scritto:
On 21/11/12 17:59:05, Alister wrote:
On Wed, 21 Nov 2012 04:43:57 -0800, Giacomo Alzetta wrote:
I just came across this:
'spam'.find('', 5)
-1
Now, reading find's documentation
Il giorno giovedì 22 novembre 2012 05:00:39 UTC+1, MRAB ha scritto:
On 2012-11-22 03:41, Terry Reedy wrote:
It can't return 5 because 5 isn't an index in 'spam'.
It can't return 4 because 4 is below the start index.
Uhm. Maybe you are right, because returning a greater value would cause
I'm trying to compile python3.3 on my (K)ubuntu 12.04, but some modules are
missing.
In particular when doing make test I get:
Python build finished, but the necessary bits to build these modules were not
found:
_bz2 _curses_curses_panel
_dbm _gdbm
Il giorno domenica 4 novembre 2012 15:56:03 UTC+1, mm0fmf ha scritto:
Giacomo Alzetta wrote:
I'm trying to compile python3.3 on my (K)ubuntu 12.04, but some modules are
missing.
In particular when doing make test I get:
Python build finished, but the necessary bits
I've just noticed that the bisect module lacks of the key parameter.
The documentation points to a recipe that could be used to handle a sorted
collection, but I think it's an overkill if I want to bisect my sequence only
once or twice with a key. Having something like `bisect(sequence,
Il giorno mercoledì 12 settembre 2012 17:54:31 UTC+2, Giacomo Alzetta ha
scritto:
I've just noticed that the bisect module lacks of the key parameter.
The documentation points to a recipe that could be used to handle a sorted
collection, but I think it's an overkill if I want to bisect
Il giorno mercoledì 12 settembre 2012 18:05:10 UTC+2, Miki Tebeka ha scritto:
I've just noticed that the bisect module lacks of the key parameter.
...
Is there some reason behind this lack?
See full discussion at http://bugs.python.org/issue4356. Guido said it's
going in, however
Il giorno domenica 19 agosto 2012 22:42:16 UTC+2, kj ha scritto:
As far as I've been able to determine, Python does not remember
(immutably, that is) the working directory at the program's start-up,
or, if it does, it does not officially expose this information.
Does anyone know why
Il giorno domenica 12 agosto 2012 23:53:46 UTC+2, Terry Reedy ha scritto:
Are you actually planning to do this, or is this purely theoretical?
Yes, I do plan to implement ipow.
Not true. Whether the function is coded in Python or C
cls.__ipow__(base, exp, mod) # or
Il giorno domenica 12 agosto 2012 06:28:10 UTC+2, Steven D'Aprano ha scritto:
On Sat, 11 Aug 2012 09:54:56 -0700, Giacomo Alzetta wrote:
I've noticed some incongruities regarding in-place exponentiation.
On the C side nb_inplace_power is a ternary function, like nb_power (see
Il giorno domenica 12 agosto 2012 13:03:08 UTC+2, Steven D'Aprano ha scritto:
On Sun, 12 Aug 2012 00:14:27 -0700, Giacomo Alzetta wrote:
From The Number Protocol(http://docs.python.org/c-api/number.html). The
full text is:
PyObject* PyNumber_InPlacePower(PyObject *o1
Il giorno venerdì 10 agosto 2012 20:50:08 UTC+2, Stefan Behnel ha scritto:
Giacomo Alzetta, 10.08.2012 10:20:
I'm trying to implement a c-extension which defines a new
class(ModPolynomial on the python side, ModPoly on the C-side).
At the moment I'm writing the in-place addition, but I
Il giorno sabato 11 agosto 2012 08:40:18 UTC+2, Stefan Behnel ha scritto:
Giacomo Alzetta, 11.08.2012 08:21:
I'd prefer to stick to Python and C, without having to put cython
sources or cython-generated c modules (which I know are almost
completely unreadable from a human point
I've noticed some incongruities regarding in-place exponentiation.
On the C side nb_inplace_power is a ternary function, like nb_power (see here:
http://docs.python.org/c-api/typeobj.html?highlight=numbermethods#PyNumberMethods).
Obviously you can't pass the third argument using the usual
I'm trying to implement a c-extension which defines a new class(ModPolynomial
on the python side, ModPoly on the C-side).
At the moment I'm writing the in-place addition, but I get a *really* strange
behaviour.
Here's the code for the in-place addition:
#define ModPoly_Check(v)
Il giorno venerdì 10 agosto 2012 11:22:13 UTC+2, Hans Mulder ha scritto:
On 10/08/12 10:20:00, Giacomo Alzetta wrote:
I'm trying to implement a c-extension which defines a new
class(ModPolynomial on the python side, ModPoly on the C-side).
At the moment I'm writing the in-place
Il giorno venerdì 10 agosto 2012 14:21:50 UTC+2, Hans Mulder ha scritto:
On 10/08/12 11:25:36, Giacomo Alzetta wrote:
Il giorno venerdì 10 agosto 2012 11:22:13 UTC+2, Hans Mulder ha scritto:
[...]
Yes, you're right. I didn't thought the combined operator would do a
Py_DECREF
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