Karsten Wutzke, 15.07.2010 21:00:
Yes, typo, I meant strictly.
Damn, I mean strongly. At least not for identifying which methods to
call depending on the type/s.
I think you meant "statically typed".
http://c2.com/cgi-bin/wiki?StronglyTyped
http://www.c2.com/cgi/wiki?StaticTypi
MRAB, 15.07.2010 21:33:
Stefan Behnel wrote:
Karsten Wutzke, 15.07.2010 20:45:
Well, I'm most experienced in OO, so writing OO in Python seems like
the way to start with Python. The visitor pattern uses single-
dispatch, that is, it determines which method to call be the type of
object p
ave to spill the type specific parts all over your code.
Stefan
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Carl Banks, 16.07.2010 07:50:
On Jul 15, 8:33 pm, Stefan Behnel wrote:
The code I referenced is from the Cython compiler, and we use it to "do
stuff" with the AST. The visitor pattern is actually a pretty common way to
bind code in a single place that does a certain thing to differen
, and be easy to add.
and - have you tried it?
Stefan
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Les Schaffer, 16.07.2010 15:07:
agree with all the other suggestions: multiple threads for data and GUI,
The way I read it, the suggestion was to use separate processes, not
multiple threads. That's a pretty important difference.
Stefan
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he/she is Australian (or British or South African or something
else), assuming that they are Europeans will hit the nail on the head
:)
:) I'm happy to see that the good old clichés still work in all directions.
Makes the world so easy.
Stefan
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1e-6 and 1e-7.
Try:
>>> format(Decimal("0"), ".11f")
'0.000'
Stefan Krah
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don't have any direct use for it, so this is mainly a fun
project to see how well I can get it integrated and how fast I can get it.
Stefan
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os
import math
...
Note that the file must have the executable bit set.
Search for "shebang", which is the spelled-out name for the "#!" special
file prefix.
Stefan
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ds added in from the extension module.
Try using Cython instead, it has native support for the buffer protocol.
Stefan
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n to wrap that
and to implement the buffer interface and all the other wrapper code. C++
support by itself is pretty good in Cython 0.13. (to be released soon, get
it from here: http://hg.cython.org/cython-closures )
Stefan
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gument (see the sort() method and the operator module).
Stefan
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kak...@gmail.com, 21.07.2010 15:38:
On Jul 21, 9:04 am, "kak...@gmail.com" wrote:
On Jul 21, 8:58 am, Stefan Behnel wrote:
kak...@gmail.com, 21.07.2010 14:36:
From the subject of my message it's clear that i get an xml message
from a socket,
Not at all, but now
Girish, 23.07.2010 08:54:
Is ter a way to change default encoding in py 2.5 ?
Yes, but it's highly discouraged. If you tell us why you want to do it, we
may be able to point to a better way to get what you want.
Stefan
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t the engine run
better with sugar. [1]
"Did you blow up your car testing that out?"
- "No, I just read comp.lang.python."
Stefan
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application level protocol?
Stefan
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ture
in what both builtins are targeted to provide. Just use one of the
map-reduce frameworks that are out there if you need concurrency in one way
or another. Special needs are not what builtins are there for.
Stefan
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kak...@gmail.com, 27.07.2010 13:58:
On Jul 27, 6:30 am, Stefan Behnel wrote:
kak...@gmail.com, 27.07.2010 12:17:
I receive the following different Xml Messages from a socket:
From a bare socket? TCP? UDP? Or what else?
Which is the best way to make a distinction between them so that
kak...@gmail.com, 27.07.2010 14:26:
On Jul 27, 8:14 am, Stefan Behnel wrote:
kak...@gmail.com, 27.07.2010 13:58:
On Jul 27, 6:30 am, Stefan Behnel wrote:
kak...@gmail.com, 27.07.2010 12:17:
I receive the following different Xml Messages from a socket:
From a bare socket? TCP? UDP
kak...@gmail.com, 27.07.2010 14:43:
On Jul 27, 8:41 am, Stefan Behnel wrote:
kak...@gmail.com, 27.07.2010 14:26:
On Jul 27, 8:14 am, Stefan Behnel wrote:
kak...@gmail.com, 27.07.2010 13:58:
On Jul 27, 6:30 am, Stefan Behnel wrote:
kak...@gmail.com, 27.07.2010 12:17:
I receive the
SAX. Again: using
ElementTree instead of SAX will avoid this kind of problem.
Stefan
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ts own encoding) and thus
fails to decode it?
Stefan
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to log in as user wsbuser with password wsb . ***
Stefan
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an assignment there which isn't an expression in Python but
a statement.
For example, you can use
f = lambda x: sys.stdout.write(str(x))
(sys.stdout.write(str(x)) is an expression)
but not
f = lambda x: print x
(print x is a statement in Python versions < 3)
Stefan
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ion is for, i. e. if it's really
a level offset calculation or something else.
Stefan
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one works well, because I believe there will
> always only be 1 None object.
Yes, and it avoids subtle bugs if someone overwrites `__eq__`
in some class:
>>> class AlwaysEqual(object):
... def __eq__(self, other):
... return True
...
>>> always_eq
Hello Peter,
On 2010-08-06 19:20, Peter Pearson wrote:
> On Fri, 06 Aug 2010 15:37:04 +0200, Stefan Schwarzer wrote:
> [snip]
>> I can imagine a case where you might want to compare a
>> string with `is`:
>>
>> FORWARD = "forward"
>> BACKWARD
Hi Steven,
On 2010-08-07 00:28, Steven D'Aprano wrote:
> On Fri, 06 Aug 2010 15:37:04 +0200, Stefan Schwarzer wrote:
>>> Plus, I believe the
>>> "==" operator will check if the variables point to the same object.
>>
>> No, that's what `is` is
airs added _after_ the "cast"
aren't included in the new dict:
>>> y[2] = 17
>>> y
{1: [1, 42], 2: 17}
>>> x
defaultdict(, {1: [1, 42]})
Stefan
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oes that. There are two ways to work around this: recent
ET versions support explicitly defining namespace-prefix mappings at a
module global level (IIRC, starting with ET 1.3/Py2.7/Py3.2), so you can
provide a fixed prefix if you know what's coming in.
Failing that, you can switch to
x27;s a bit
more obvious that these are just "magic numbers", so
presumably the constant names should be used instead.
Stefan
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In [2]: %paste
at the prompt it gives me (before I pasted anything)
In [2]: %paste
File "", line 1
http://pypi.python.org/pypi/ipython/0.10
^
SyntaxError: invalid syntax
So far, I couldn't find anything on the net on this.
[1] http://pypi.python.org/pypi/ipython
Stefan
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Aahz, 09.08.2010 18:52:
In article,
Stefan Behnel wrote:
First of all: don't use SAX. Use ElementTree's iterparse() function. That
will shrink you code down to a simple loop in a few lines.
Unless I'm missing something, that only helps if the final tree fits into
memory. What
Hi Robert,
On 2010-08-09 22:23, Robert Kern wrote:
> On 2010-08-09 06:42 , Stefan Schwarzer wrote:
>> Unfortunatey, when I enter
>>
>>In [2]: %paste
>>
>> at the prompt it gives me (before I pasted
On 2010-08-09 23:43, Stefan Schwarzer wrote:
> I got that traceback as soon as I typed in "%paste" and
> pressed enter, without pasting anything in the terminal.
> I had assumed it works like :paste in Vim, activating a
I meant ":set paste" of course.
Stefan
--
h
hat's also a huge advantage over SAX: iterparse code is much easier
to tune into a streamlined loop body when you need it.
Stefan
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ne creative thing which was ever done in Dotnet.
Erm, this is Microsoft. It's not about being creative, it's about selling
stuff to users.
Stefan
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this is
supposed to run on a server, it means that it will always suffer from the
"headless click-here-to-continue" problem.
It might not be too hard to port the app to Mono, but the rather explicit
claim above doesn't make me feel very comfortable about that upgrade path...
St
you're referring to, but I only
recently gave a beginners' talk at EuroPython:
http://sschwarzer.com/download/robust_python_programs_europython2010.pdf
The topic of identity and assignments starts on slide 7,
nice graphics start on slide 10. ;-)
Stefan
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In case anyone wondered: Hyderabad is likely referring to some place in Asia:
http://en.wikipedia.org/wiki/Hyderabad_%28disambiguation%29
Stefan
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that your examples
above span both the language and the stdlib, which are put under different
constraints by the moratorium.
Stefan
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here?), but
>>> dict(D.__dict__)
{'__doc__': None, '__module__': '__main__'}
indicates that D doesn't contain n. But C does:
>>> dict(C.__dict__)
{'__dict__': ,
'__doc__': None,
'__init__': ,
'__module__': '__main__',
'__weakref__': ,
'n': 1}
I hope everything I wrote above is valid. If not, please
correct me. :-)
Anyway, depending on what you want, either of the two
variants might be ok. In any case I'd include a meaningful
comment on why you actually wrote what you wrote. :-)
Stefan
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urns a list of names. What you named
`files` should actually be `filename`. What you got
printed in the loop are the lengths of each filename.
Stefan
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ute
filenames appropriate for my system, everything works.
Maybe the code you included in this post isn't the same
which led to the error?
Stefan
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tions have been
coming up every couple of weeks. The responses often include mostly
complete implementations that you can borrow from.
Stefan
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Standish P, 16.08.2010 09:20:
We envisage an exogenous stack which has malloc() associated
with a push and free() associated with a pop.
What's your use case?
Stefan
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b.join([lines[index][wn][2] for index in range(5)])
Moreover, the repetition of this line looks as if you wanted
to put the right hand sides of the assignments in a list,
instead of assigning to distinct names (`vf` etc.).
By the way, you use the number 5 a lot. I guess this should
be a constant, too.
| alf.write(tp+'\t'+vf+'\t'+vq+'\t'+al+'\t'+bt+'\t'+vs+'\n')
Suggestion: Use
tab.join([tp, vf, vq, al, bt, vs]) + "\n"
Again, not using distinct variables would have an advantage
here.
| alf.close()
| print "Done"
Stefan
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'%Y-%m-%d', '%m%d%Y')
or even
self.expiration_date = translate_date(
find(response, 'MPNExpirationDate').text,
'%Y-%m-%d',
'%m%d%Y')
for consistency.
This not only limits the width but also makes the nesting of
the calls more visible.
Stefan
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On 2010-08-17 17:44, AK wrote:
> On 08/17/2010 10:28 AM, Stefan Schwarzer wrote:
>> I'd probably reformat this to
>>
>>self.expiration_date = translate_date(
>> find(response, 'MPNExpirationDate').text,
>>
ght here; you should keep the overall
readability or (maintainability on the whole) in mind.
I agree with Neil that good refactoring can _improve_ the
understandability of the code, and it won't necessarily
require you to look up the code of the extracted
function or method.
Stefan
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ht help:
http://www.slideshare.net/onyame/mixing-python-and-java
Personally, I've used JCC for accessing Lucene (a search
engine framework implemented in Java). It was a bit
rough in some places, but overall quite usable.
Stefan
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t;> But.. why horizontal scrolling, isn't autowrap much better than that?
>
> Do you seriously use autowrapper when writing code?
I think he means wrapping on the screen, not actually
inserting line breaks.
Stefan
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e parentheses are also used to group expressions.
For example,
>>> 2 * (1+2)
6
If it were as you would like, the result would have been
(3, 3)
So because inside parentheses
already denotes an expression you have to add a comma to
distinguish a one-element tuple from an expression.
Stefan
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ug.co.nz>
I can't get the page; all I get is an error message:
"""
Not Found
The requested message, i4ku71$fd...@lust.ihug.co.nz, could not be found.
"""
Can you please give a part of the message to search for or
even better, an URL that works? :-)
Thanks,
Stefan
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l
Rapid Development
http://www.amazon.com/x/dp/0072850604/
Tom DeMarco, Timothy Lister
Waltzing With Bears: Managing Risk on Software Projects
http://www.amazon.com/x/dp/0932633609/
Stefan
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eads the whole
file at once and returns a list of the lines (including line
end characters, by the way). What you probably want is
for line in pipe:
print line,
which reads and prints the file contents line by line.
Stefan
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can try to compile it using Cython.
Stefan
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the maintenance cost will always be
the dominating factor anyway.
Stefan
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link to the module, so that we know what module you are
actually talking about?
Also, if the project that provides the module has a mailing list, you might
want to ask there.
Stefan
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The `print` statement after
the `retrbinary` call?
> Some error I got, but this was in yesterday, I don't remember the text
> of the error.
Can't you reproduce the error by executing the script once
more? Can you copy the file to another server and see if the
problem shows up there,
't look as if
they were the purpose of the program, but rather mostly some
preparation/setup before solving the actual problem.
Maybe it's more helpful to tell us what you want to achieve
in the end and we might be able to make suggestions on that.
How long is the shell script and what's your Python code so
far?
Stefan
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Hi durumdara,
On 2010-08-24 16:29, Stefan Schwarzer wrote:
>> I experienced some problem.
>> The server is Windows and FileZilla, the client is Win7 and Python2.6.
>> When I got a file with size 1 303 318 662 byte, python is halt on
>> "retrbinary" line
ommand for the file that troubles you.
I'm the maintainer of ftputil and if you get the same or
similar error here, I may find a workaround for ftputil. As
it happens, someone reported a similar problem (_if_ it's
the same problem in your case) just a few days ago. [2]
[1] http://ftputil.sschwarzer.net
[2] http://www.mail-archive.com/ftpu...@codespeak.net/msg00141.html
Stefan
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Hi durumdara,
On 2010-08-25 11:18, durumdara wrote:
> On aug. 25, 08:07, Stefan Schwarzer wrote:
>>
>> The file is 2 GB in size and is fully transferred, without
>> blocking or an error message. The status message from the
>> server is '226-File successfully tr
http://...', ...]
from lxml.html.builder import A
for td in td_list:
index = int(td.text)
a = A("some text", href=links[index])
td.getparent().replace(td, a)
Stefan
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Johannes Bauer wrote:
> when I read in a XML document with the xml.dom.minidom parser and write
> it out again, an attribute is lost:
>
> Input:
>
>
> [...]
>
> Output:
>
>
> How can I fix this?
You don't have to. UTF-8 is the default encoding, so th
Python compiles Python code to *byte-code* and then *interprets* that in a
virtual machine (which happens to be written in C, hence the name).
Stefan
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bvious, as it
contains lots of runtime type specialisations and optimisations. But that's
the price you pay for fast code. And you can make Cython leave out most of
the duplicated code (i.e. the pessimistic fallbacks) by adding type hints
to your code.
Stefan
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Johannes Bauer wrote:
> Stefan Behnel schrieb:
>> Johannes Bauer wrote:
>>> when I read in a XML document with the xml.dom.minidom parser and write
>>> it out again, an attribute is lost:
>>>
>>> Input:
>>>
>>>
>>> [...]
>
Johannes Bauer wrote:
> Stefan Behnel schrieb:
>
>>> Can I somehow force Python to generate it anyways?
>> Did you try passing encoding='UTF-8' on serialisation?
>
> Uhm... nope - how can I do that?
Well, depends on what your code currently does
Johannes Bauer wrote:
> Stefan Behnel schrieb:
>
>>> So I need to build hyperlinks (a elements) with href attribute and
>>> replace the text elements (numbers) somehow.
>> Try lxml.html instead. It makes it really easy to do these things. For
>> example, you c
Hi,
this kind of stuff is commonly discussed on the python-ideas mailing list.
You might want to search that list and/or repost this over there.
Stefan
kindly wrote:
> I am sure people have thought of this before, but I cant find where.
> I think that python should adapt a way of de
amespace, just
> like the elements?
There isn't, because this is the correct behaviour according to the spec.
http://www.w3.org/TR/REC-xml-names/#defaulting
"""
A default namespace declaration applies to all unprefixed element names
within its scope. Default namespace declarations do not apply directly to
attribute names; the interpretation of unprefixed attributes is determined
by the element on which they appear.
"""
Stefan
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-2006-1.pdf
and then decide to switch to an appropriate concurrency model for your use
case.
Stefan
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opriate' programming language. Matter of available
skills, mostly. There's usually a lot less code to be written that deals
with concurrency than code that implements what the person paying you makes
money with, so learning a new library may be worth it, while learning a new
language may not.
Stefan
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es every problem perfectly. At some point you need a
> different tool to get the raw power of your machine. C (and perhaps
> Fortran) are the weapons of choice for number crunching.
Well, and there's always Cython to the rescue when you need it.
Stefan
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re not (or likely not) benefit from multiple-cores.
Claiming that "pure Python code does not free the GIL" in the context of
CPython when you define "pure Python code" as code that does not depend on
C code is plain flawed.
Stefan
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mplete document (represented in ET as
an ElementTree object), fromstring() and especially the 'literal wrapper'
XML() are made for parsing strings, which (most?) often only contain XML
fragments. With a fragment, you normally want to continue doing things like
inserting it into another tree,
Carl Banks wrote:
> On Jun 25, 10:11 pm, Stefan Behnel wrote:
>> Carl Banks wrote:
>>>> Why isn't et.parse the only way to do this? Why have XML or fromstring
>>>> at all?
>>> Because Fredrick Lundh wanted it that way. Unlike most Python
>&g
the XML
must not have an encoding declaration (which would render it non
well-formed). This is convenient for parsing HTML, it's less convenient for
XML usually.
If what you meant is actually parsing from a byte string, this is easily
done using BytesIO(), or StringIO() in Py2.x (x<6).
Stefan
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ugh practicality beats purity, sometimes... ;)
Stefan
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Paul Rubin wrote:
> Stefan Behnel writes:
>>> Besides some interface glitches, like returning None
>>> on delete if I recall correctly.
>> That's actually not /that/ uncommon. Operations that change an object are
>> not (side-effect free) functions, so
> What happened to Python?
Have you tried Python 3.1? Have you made sure that both Python interpreters
were build with the same compiler arguments and that none of them is a
debug build?
Stefan
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Hallvard B Furuseth wrote:
> Stefan Behnel writes:
>> João Valverde wrote:
>>> Besides some interface glitches, like returning None
>>> on delete if I recall correctly.
>> That's actually not /that/ uncommon. Operations that change an object are
>> no
n of them will do just fine. And if you find a case where those
just don't fit, you may need a database anyway.
Stefan
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João Valverde wrote:
> I wouldn't consider anything other than C for such a module on
> efficiency alone, unless it was a prototype of course. But I have little
> knowledge about the Python C API.
Cython is your true friend, if only for rapid prototyping.
http://cython.org/
S
Kee Nethery wrote:
> On Jun 25, 2009, at 11:39 PM, Stefan Behnel wrote:
>> parsing a
>> document from a string does not have its own function, because it is
>> trivial to write
>>
>> tree = parse(BytesIO(some_byte_string))
>
> :-) Trivial for someone f
t
slow, and then check what to do about the real problem.
Stefan
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totally non-obvious to me.
> #15 columns
> if len(row) != 15:
>break
>
> t[s%bufsize] = tuple(row)
>
> #Do this all the way at the end for flushing.
> if (s%bufsize != 0):
>dset[(s//bufsize)*bufsize:s]=t[0:s%bufsize]
If you *really* think your code is no
meant
by passing that byte string in the first place? And where is the difference
between accidentally passing a byte string and accidentally passing another
non-printable object? Handling this "better" may simply hide the bugs in
your code, I don't find that's a
ey only test a single int/char variable, even when
you write things like "elif x in [1,5,9,12]". This works in Cython, because
we know that the comparison to a C int/char is side-effect free. It may not
always be side-effect free in Python, so this won't work in general. It
wo
lags["CDATA"], contentModelFlags["RCDATA"])
constant? If that is the case, I'd cut it out into a class member (or
module-local variable) first thing in the morning. And I'd definitely keep
the result of the "in" test in a local variable for reuse, seeing how
nsive.
Did you implement this and prove your claim in benchmarks? Taking a look at
the current implementation, I'm pretty sure a dict-based implementation
would outrun it in your first try.
Stefan
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Stefan Behnel wrote:
> John Nagle wrote:
>>Here's some actual code, from "tokenizer.py". This is called once
>> for each character in an HTML document, when in "data" state (outside
>> a tag). It's straightforward code, but look at all t
thin the Python bytecode for the big function.
Hmm, yes, the actual code inside the conditionals is pretty short, so the
call overhead might hurt here.
Stefan
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Paul Rubin wrote:
> Stefan Behnel writes:
>>> The series of tests is written that way because there is no case
>>> statement available. It is essentially switching on a bunch of
>>> character constants and then doing some additional tests in each
>>> bran
Paul Rubin wrote:
> Stefan Behnel writes:
>>> # Keep a charbuffer to handle the escapeFlag
>>> if self.contentModelFlag in\
>>> (contentModelFlags["CDATA"], contentModelFlags["RCDATA"]):
>> Is the tuple
>&g
Paul Rubin wrote:
> Stefan Behnel writes:
>> You may notice that the creation of this exact tuple appears in almost all
>> if the conditionals of this method. So it is part of the bottleneck.
>
> I don't think so. The tuple is only created when the character has
>
ars})
> self.lastFourChars += chars[-4:]
> self.lastFourChars = self.lastFourChars[-4:]
> return True
Giving this some more thought, I'd also try is to split the huge
if-elif-else block like this:
if data in string_with_all_special_characters:
if data == '&' ...:
...
else:
...
So there are three things to improve:
- eliminate common subexpressions which you know are constant
- split the large conditional sequence as shown above
- use separate dataState() methods when inside and outside of CDATA/RCDATA
blocks and (maybe) escaped blocks
Stefan
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