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in the
installer. Basically a whole heap of extra work.
I think one of the special things about Python is its batteries
included approach, and a crypto library would seem to be an obvious
battery to install since it doesn't (or needn't) depend on any other
library or application.
--
Nick Craig-Wood
example shows it's possible to do it in
one call.
There is a PEP about this...
API for Block Encryption Algorithms v1.0
http://www.python.org/peps/pep-0272.html
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for its control programs.
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://www.google.com/search?q=cache:U5-RsbkSs0MJ:www.cs.chalmers.se/Cs/Grundutb/Kurser/krypto/lect04_4.pdf
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archives first).
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is essentially a class (in the OOP sense, not the python-
specific classobj sense). You can call a type or class to create an
instance of that class or type. Here, you call the 'instancemethod' type
to create an instance of type 'instancemethod'. Makes sense ... in
hindsight.
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Craig Ringer
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Philip Smith [EMAIL PROTECTED] wrote:
I understand the algorithm quite well but how to code the multiplication
stage most efficiently in python eludes me.
You might want to look at
http://gmpy.sourceforge.net/
It has very fast multiplication up to any size you like!
--
Nick Craig-Wood
with the os.* family
perhaps you may find pexpect a wee bit easier...
If using 2.4 the subprocess module is a good solution too. It lets
you catch stdout/stderr easily.
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been good exercise!
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vikings = [Viking()] * 7
vikings[0] is vikings[1]
True
whereas
vikings = [Viking() for _ in range(7)]
vikings[0] is vikings[1]
False
So you want this...
orders = [ Viking().order() for _ in range(7) ]
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.MyOldException: __main__.MyOldException instance at 0xb7df4cac
After that I recalled a thread on python-dev about it
http://mail.python.org/pipermail/python-dev/2004-August/046812.html
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, map(ord, string))'
10 loops, best of 3: 15.6 usec per loop
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to your ISP's news server, *then* you can subscribe
to comp.lang.python.
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-- or if they are,
they can find it in comp.lang.python.
Going by the general reaction on c.l.py, I think it'd be more accurate
if you left that at Please stop posting.
Sorry for the cross-post, and for this perl-python moron who appears
to have nothing to do with either, or any knowledge of them.
--
Craig Ringer
of objects into a functionally
styled processing pipeline, say a series of functions that each just
return the result of a listcomp/genexp.
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of 'binary
files'. :)
non-ascii
That's not really safe when dealing with utf-8 files though, and IIRC
with UCS2 or UCS4 as well. The Unicode BOM its self might (I'm not sure)
qualify as ASCII.
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heard of Hamming sequences before!
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anything useful so I
removed them)
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Steven Bethard [EMAIL PROTECTED] wrote:
Nick Craig-Wood wrote:
Thinking about this some more leads me to believe a general purpose
imerge taking any number of arguments will look neater, eg
def imerge(*generators):
values = [ g.next() for g in generators ]
while True
(re.search(r'mult (\d+) (\d+)', line)):
do_mult(m.value.group(1), m.value.group(2))
elif m.set(re.search(r'help (\w+)', line)):
show_help(m.value.group(1))
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it must be possible to add a few simple crypto modules to
python?
That said
a) IANAL
b) 'apt-get install python-crypto' works for me ;-)
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(':',1)))
. data = ''.join(x for x in initer)
because that seems like a pretty ugly hack (and please ignore the
variable names). Perhaps a way to get the file to seek back to the point
last read from the iterator when the iterator is destroyed?
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of the iterator when read() etc are called? If not, I
favour the suggestion in the referenced post - file should probably fail
noisily, or at least emit a warning.
What are others thoughts on this?
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(':')[:3]
Or this version if you want something other than as the default
a, b, b = (line.split(':') + 3*[None])[:3]
BTW This is a feature I miss from perl...
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On Sat, 2005-01-22 at 12:20 +0100, Alex Martelli wrote:
Craig Ringer [EMAIL PROTECTED] wrote:
. data = ''.join(x for x in infile)
Maybe ''.join(infile) is a better way to express this functionality?
Avoids 2.4 dependency and should be faster as well as more concise.
Thanks - for some
Alex Martelli [EMAIL PROTECTED] wrote:
Nick Craig-Wood [EMAIL PROTECTED] wrote:
...
Or this version if you want something other than as the default
a, b, b = (line.split(':') + 3*[None])[:3]
Either you mean a, b, c -- or you're being subtler than I'm
grasping.
Just a typo
!
http://sourceforge.net/tracker/index.php?func=detailaid=720908group_id=5470atid=105470
However its been fixed in a recent Python 2.3.
(I was bitten by the same thing which used to fail but now works after
an upgrade of python 2.3!)
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On Fri, 2005-01-21 at 22:38 +0800, Craig Ringer wrote:
consecutive_sets = ( x[offset:offset+subset_size]
for subset_size in xrange(2, len(x))
for offset in xrange(0, len(x) + 1 - subset_size) )
Where 'x' is list to operate on, as I should've initially
and library modules
return generators for things.
I know this is now the case for reading lines in a file or with the
new iterator package. But what else ? Does Craig Ringer answer mean
that list comprehensions are lazy ?
Nope, but generator expressions are, and they're pretty similar.
Where can I
http://docs.python.org/whatsnew/node4.html
http://www.python.org/dev/doc/newstyle/ref/genexpr.html
for details.
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in the error message to that effect.
I've just checked the OSX 10.3 machine here, and it fails to import
tkinter there too. I'd say Apple just don't build Python with Tk
support.
What do I do to set it up so I can use Tkinter?
Try Google - this seems to be a moderately FAQ for MacOS/X.
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://docs.python.org/api/tupleObjects.html
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and/or failing to detect and
handle or propagate an exception.
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this - as that can often be
very helpful both in understanding what you're thinking and in
suggesting a suitable approach or alternative.
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is
a problem now-a-days.
AES in the core python library would be very useful and it would
discourage people from writing their own crypto routines (looks easy
but isn't!)
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of referencing deleted memory by accident.
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.
That said, I do think the rules deserve consideration and respect -
they're usually there because of many others' experience over time. It's
interesting to learn those lessons first hand, but it's nice to be able
to avoid repeating every single one of them.
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, potato.123):
print f, detectMimeType(f)
...
prints
index.php application/x-php
index.php3 None
prog.cc text/x-c++-src
prog.cpp text/x-c++-src
flodge.xsl xsl
Makefile text/x-makefile
myMakefile text/x-makefile
potato.123 None
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An interactive high-level object-oriented la
ii python2.4 2.4-2 An interactive high-level object-oriented la
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(and eventually) - stable.
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(generator expressions, list comprehensions, for loops, ...?) over
(sequences, iterators, generators)
I happen to be extremely fond of the flexibility this provides, but one
obvious way to do it there is not.
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]
;-)
If it means I _never_ have to see that list comprehension again, then
seeing 'flatten' go into itertools would make me very, very happy :-P
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:
That'll work fine in Python 2.3. I think you meant:
print sum(ord(x) for x in PyPy)
which is a different matter entirely (well, regarding compatibility
anyway).
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.
I'd use:
os.popen(/bin/exe.x, w).write(\
CategorY = GRIB
etc.
)
myself, but that's just taste (well, and performance I suspect).
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specific to the
Python/C API).
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str.encode(), str.decode() and
unicode() calls where appropriate.
On a side note, PEP 263 handles the text encoding interpretation of
Python program source, and is well worth reading and following.
http://python.org/peps/pep-0263.html
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, but
I hope I made sense.
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. print %s %s % tuple(x.split()[4:6])
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didn't have
the GNU readline development headers installed, so Python disabled
readline support when it was compiled. That's just a guess, but seems
pretty likely.
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with it?
I think your question is the same problem as another recent poster -
that is, you didn't have the Tcl and Tk headers installed when you
installed Python. Please see my answer to Help uninstalling/installing
Python 2.4 (Yes, I know yours isn't Python 2.4 - it doesn't matter).
--
Craig Ringer
On Thu, 2005-01-06 at 23:05, Peter Maas wrote:
Craig Ringer schrieb:
It would certainly be difficult to track all harmful code constructs.
But AFAIK the idea of a sandbox is not to look at the offending code
but to protect the offended objects: files, databases, URLs, sockets
etc
about the best way to solve
your problem, you'll probably need to explain a bit more of your problem
- like what your extension module is doing that makes it have to pass
PyCObjects around and get Python code to work with them.
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lots of other handy tools, so I strongly recommend checking
it out.
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providers would like to have to do all the
time for many hosted sites.
I wonder if SCGI or a similar persistent CGI solution might be more
practical for running CGI scripts under specific user accounts.
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) installed.
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a global and
local environment for your script to run in.
I do not know if it is possible to disable or override 'import'..
You can do a fair bit to it by wrapping/replacing __builtin__.__import__
. Preventing people from getting around what you've done, though... not
sure.
--
Craig Ringer
it.
My first thought would be to express your 'A and B' regex as:
(A.*B)|(B.*A)
with whatever padding, etc, is necessary. You can even substitute in the
sub-regex for A and B to avoid writing them out twice.
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to keep an eye on the licenses of any
extensions you used, like ReportLab, PIL, mx, database interfaces,
twisted, etc. Many are licensed under the same license as Python or an
MIT-like license, but of course some Python extensions are not and you
would need to consider that.
--
Craig Ringer
--
http
sock.py
but ./sock.py results in a :bad interpreter error
how do i troubleshoot something like this?
You probably have Windows-style line endings in the file. The kernel
sees the ^M at the end of the line and gets all confused.
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module
that uses your C module internally (see PIL for a good example of this).
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you to do so, and it's hardly worth repeating
the work if you don't have to.
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' on many UNIX systems; no idea about Windows.
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; however, it's my understanding that compressing individual files
also means that in the case of damage to the archive it is possible to
recover the files after the damaged file. This cannot be guaranteed when
the archive is compressed as a single stream.
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, rightstring)
or
%20s: %-40s % (leftstring, rightstring)
That's Python's 'printf' style string formatting.
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):
cls.class_level_variable = newval
setvaluecls = classmethod(setvaluecls)
sevaluecls and setvalue look the same to callers calling them on an
instance of the class.
I have no idea if that's actually appropriate for your needs, it's just
a stab in the dark, but perhaps it might be.
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. This is
probably not the right place.
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it.
It wouldn't hurt to point C extension authors at things like the 'es'
encoded string format for PyArg_ParseTuple to help them make their code
better behaved with non-ascii text.
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.
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On Wed, 2004-12-29 at 02:08, Cameron Laird wrote:
In article [EMAIL PROTECTED],
Craig Ringer [EMAIL PROTECTED] wrote:
.
.
.
IMO the reference behaviour of functions in the C API could be
clearer. [snip
in this situation is don't
use __slots__. If you think you need __slots__, still don't use
__slots__.
I've made use of __slots__ once myself for an optimisation when
subclassing `str', but if you're not using it for a serious optimisation
need it's probably best to steer clear.
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http
often :-P
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+); # 2. entities
|([^'\=\s]+) # 3. text strings (no special characters)
|(\s+) # 4. whitespace
|(.) # 5. special characters
, re.VERBOSE)
Its probably faster though, so I give in gracelessly ;-)
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Fredrik Lundh wrote:
Craig Ringer wrote:
It's hard to consistently support Unicode in extension modules without
doing a lot of jumping through hoops. Unicode in docstrings is
particularly painful. This may not be a big deal for normal extension
modules, but when embedding Python it's a source
that you are looking in the wrong place!
...however that page doesn't exist ;-)
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(re.search(r'^(\d+)$', line)) or m[-1]:
print int,int(m[-1].group(1))
elif m.append(re.search(r'^(\d*\.\d*)$', line)) or m[-1]:
print float,float(m[-1].group(1))
else:
print unknown thing, line
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- it might be a good idea to search the archives.
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think
it'd certainly be well worth a try, especially if you're writing any
more complex applications.
That said, for 90% of users development time matters more than execution
speed, and that's another matter entirely.
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of these issues would make it
a fair bit nicer again, especially for people embedding Python in apps
(a place were it can seriously excel as a scripting/extension/glue
language).
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the issue. After all, these two are the
same:
def callfunc(function,args):
return apply(function,args)
and
def callfunc(function,args):
return function(*args)
its just an (IMO trivial) difference in syntax. I'd be interested in
knowing if there is in fact more to it than this.
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Craig
comp.lang.python (this
list/newsgroup).
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very real performance reasons to
do it in C rather than Python (i.e. I'm manipulating the internals of
the numerator and denominator by hand for performance in the GCD
function)
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I affirm brethren by the boasting in you which I have in Christ Jesus
our Lord
Jim Hill [EMAIL PROTECTED] wrote:
Nick Craig-Wood wrote:
I prefer this
... I'll have %(amount)s %(what)s
... for $%(cost)s please % locals()
Looks pretty slick. This might just be what I need.
Its almost as neat as perl / shell here documents and emacs parses
strings
it directly to a file to be accessed
as needed?
I'm afraid I just don't understand that. Do a DOS directory? If you
want to list the contents of a directory, see help(os.listdir) .
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print \
... I'll have %(amount)s %(what)s
... for $%(cost)s please % a.__dict__
I'll have 10 rutabaga
for $17.5 please
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)
else:
map[key] = [ value ]'
1000 loops, best of 3: 1.11e+03 usec per loop
Not that timing is everything of course ;-)
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Keith Dart [EMAIL PROTECTED] wrote:
Nick Craig-Wood wrote:
This sounds rather like the new subprocess module...
import subprocess
rc = subprocess.call([ls, -l])
total 381896
-rw-r--r--1 ncw ncw 1542 Oct 12 17:55 1
[snip]
-rw-r--r--1 ncw ncw 713 Nov 16 08:18 z
scope(instead of file scope as I want). Is there any solution to
my problem? Or should I solve it in another way?
def import_xml:
try:
import libxml
except ImportError,err:
# handle the error
return libxml
libxml = import_xml()
--
Craig Ringer
--
http
On Wed, 2004-12-15 at 21:44, Craig Ringer wrote:
def import_xml:
try:
import libxml
except ImportError,err:
# handle the error
return libxml
libxml = import_xml()
Though my personal approach would actually be:
try:
import libxml
except ImportError,err
():
i = 1
return ++i
$ pychecker plusplus
Processing plusplus...
Warnings...
plusplus.py:4: Operator (++) doesn't exist, statement has no effect
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(or
anything that means you have to seek around the file), I'd say you're
SOL.
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'
byte_chr = chr(int(byte,2))
byte_chr
'@'
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ncw 713 Nov 16 08:18 z~
print rc
0
IMHO the new subprocess module is a very well thought out interface...
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Nick Craig-Wood [EMAIL PROTECTED] wrote:
Robert Kern [EMAIL PROTECTED] wrote:
Personally, I loathe writing at any length inside a Web browser and
prefer to use a real editor at all times.
Me too! You need mozex...
http://mozex.mozdev.org/
Here is a good page about Wikis (from
%x % int(escapeseq[2:-1])).decode(unicode_escape)
...
print ' '.join([ unescape(x) for x in entities ])
비 행 기 로 보 낼 거 에 요 내 면 금 이 얼 마 지 잠
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On Fri, 2004-12-10 at 16:09, Craig Ringer wrote:
On Fri, 2004-12-10 at 08:36, harrelson wrote:
I have a list of about 2500 html escape sequences (decimal) that I need
to convert to utf-8. Stuff like:
I'm pretty sure this somewhat horrifying code does it, but is probably
an example
Robert Kern [EMAIL PROTECTED] wrote:
Personally, I loathe writing at any length inside a Web browser and
prefer to use a real editor at all times.
Me too! You need mozex...
http://mozex.mozdev.org/
Not sure about Mac support though
/OT
--
Nick Craig-Wood [EMAIL PROTECTED] -- http
On Wed, 2004-12-08 at 13:43, Craig Ringer wrote:
Hi folks
I'm currently working on a fairly well internationalised app that embeds
a Python intepreter. I'd like to make the docstrings translatable, but
am running into the issue that the translation function returns unicode
data
.5
truncates
divides by 10**n.
Don't confuse this trick with giving us the correct result though,
it's still floating point:
round(1.77499, 2)
1.78
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'Where am I allowed
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