complicated code into a method with a useful name,
or add well named intermediate variables, or add an assertion.
Its a point of view... Not 100% sure I agree with it but I see where
he is coming from. I like a doc-string per public method so pydoc
looks nice myself...
--
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Dan Sommers <[EMAIL PROTECTED]> wrote:
> On 28 Feb 2005 10:30:03 GMT,
> Nick Craig-Wood <[EMAIL PROTECTED]> wrote:
>
> > Actually I would say just access the attribute directly for both get
> > and set, until it needs to do something special in which case use
ept the right operand: when an instance of
a given class is expected, an instance of a subclass of that class
is always acceptable.
You could try this with a local copy of decimal.py since it is
written in Python.
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pe (like the warnings subsystem).
This is surely a job for pychecker / pylint?
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Cameron Laird <[EMAIL PROTECTED]> wrote:
> gf, remember to write
>
>sys.stdout.flush()
>
> rather than
>
>sys.stdout.flush
>
> That's a mistake that catches many.
Many old perl programmers anyway (me included)!
Its also a mistake pychecker
y the get method) which is often the encapsulation you
really want - and that is something you can't do in C++.
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he data you want to pass is structured then you might consider
XML-RPC which is a cross platform way of passing structured data
around. XML-RPC is part of the python standard library
(SimpleXMLRPCServer and xmlrpclib) and there seem to be several
implementations for PHP
http://www.google.co.uk/sea
f and fcntl is
unspecified.)"
see man lockf and man flock
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er method to do this? I propose joinany which will
join any type of object together, not just strings
That way it becomes less of a poke in the eye to backwards
compatibility too.
> Nick "Explicit is better than Implicit"
Aye!
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ish (being lazy) that there was a seperate
debian package for just it and not the whole of Zope.
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ners with one-liners.
c) add a documentation patch
d) add a test suite patch
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Yes. Unless you work in the telcoms industry, where, for example if
you order a 2 Mbit/s line you'll get
2 * 1024 * 1000 bits / s
;-)
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lds are done with plain gcc of course.
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indows) on a linux
build host. The windows builds are done with a mingw cross compiler.
It would be interesting if we could do this with python + extensions
also.
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else:
# do stuff when not found
The last language I saw with this very useful feature was FORTH in
about 1984!
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Christos TZOTZIOY Georgiou <[EMAIL PROTECTED]> wrote:
> On 09 Feb 2005 10:31:22 GMT, rumours say that Nick Craig-Wood
> <[EMAIL PROTECTED]> might have written:
>
> >But you won't be able to md5sum a file bigger than about 4 Gb if using
> >a 32bit processor (
gt;
> Emacs + CVS (or CVSNT) should work just fine in Windows either.
When I have to edit stuff on windows I use emacs. Cvs works fine on
windows too. I haven't tried cvs in emacs on windows, but I suspect
it will work fine as all emacs does is shell out to the cvs binaries.
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)
[(1, 4), (2, 5), (3, 6)]
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ble objecst is the comparability. In java, this is done using the
> equals method.
>
> So in the end, the actual mapping of key, value looks like this:
>
> hash(key) -> [(key, value), ]
Thats called hashing with chaining.
See Knuth: Sorting and Searching if you want to kno
QOTW: "Such infrastructure building is in fact fun and instructive -- as
long as you don't fall into the trap of *using* such complications in
production code, where Python's simplicity rules;-)." -- Alex Martelli
http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/41a6c
QOTW: "Such infrastructure building is in fact fun and instructive -- as
long as you don't fall into the trap of *using* such complications in
production code, where Python's simplicity rules;-)." -- Alex Martelli
http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/41a6c
Thomas Heller <[EMAIL PROTECTED]> wrote:
> Nick Craig-Wood <[EMAIL PROTECTED]> writes:
> > Here is an implementation of md5sum in python. Its the same speed
> > give or take as md5sum itself. This isn't suprising since md5sum is
> > dominated by CPU usage
ile = open(fn, "rb")
>>> size = os.path.getsize(fn)
>>> size
8590983168L
>>> hash = md5.md5(mmap.mmap(file.fileno(), size)).hexdigest()
Traceback (most recent call last):
File "", line 1, in ?
OverflowError: memory mapped size is too large (limited by C int)
>>>
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27;... or die "You [EMAIL PROTECTED]"'
works even better ;-)
Thanks for a very amusing post!
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0 176 °
> de 222 Þ
> 8a 138
> e3 227 ã
> b5 181 µ
> b7 183 ·
> 51 81 Q
> a7 167 §
> c4 196 Ä
> d8 216 Ø
> e9 233 é
> ed 237 í
> eb 235 ë
>
> which is not even close, and yes, I know that it's not the same
> code.
Actually the hex digi
5sum(files):
for filename in files:
try:
print "%s %s" % (md5file(filename), filename)
except IOError, e:
print >> sys.stderr, "Error on %s: %s" % (filename, e)
if __name__ == "__main__":
md5sum(sys.argv[1:])
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tation which is only available in
HTML format - I'd much rather type "pydoc whatever" to see it all,
rather than have to load my browser, and click through several layers
of web pages.
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sions of
DES for instance).
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.
...it also uses python for its control programs.
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API. The cryptkit way is better than ECB
> example I gave, but the ECB 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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depend on any other
library or application.
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ome up with, via
Google's Cache.
http://www.google.com/search?q=cache:U5-RsbkSs0MJ:www.cs.chalmers.se/Cs/Grundutb/Kurser/krypto/lect04_4.pdf
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ng wrong.
>
> While not a 'real' answer - I use pexpect to automate my ssh scripts
> these days as I had a few problems using ssh with the os.* family
> perhaps you may find pexpect a wee bit easier...
If using 2.4 the subprocess module is a good solution
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!
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create another type.
Well, a type 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'.
the PyQt/PyKDE list (and search its
archives first).
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newsreader to use that. Once your newsread
is talking correctly to your ISP's news server, *then* you can subscribe
to comp.lang.python.
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it -s'import operator; string =
"abcdefghij13123kj12l3k1j23lk12j3l12kj3"' \
'reduce(operator.xor, map(ord, string))'
10 loops, best of 3: 15.6 usec per loop
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;>> raise MyOldException
Traceback (most recent call last):
File "", line 1, in ?
__main__.MyOldException: <__main__.MyOldException instance at 0xb7df4cac>
>>>
After that I recalled a thread on python-dev about it
http://mail.python.org/pipermail/python-dev
order()] * 7
> py> ', '.join(orders)
> 'Spam, Spam, Spam, Spam, Spam, Spam, Spam'
Thats still one Viking making 7 orders surely?
Eg
>>> vikings = [Viking()] * 7
>>> vikings[0] is vikings[1]
True
whereas
>>> vikings = [Viking() for _ in rang
code]
Thanks for some more examples of fp-style code. I find it hard to get
my head round so its been good exercise!
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()?
> >
> >
> > Sure, assuming you can provide a rigorous definition 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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so small and approachable.
I also love the way I can chuck a bunch 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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quot; moron who appears
to have nothing to do with either, or any knowledge of 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):
> >
, hamming5) ):
yield n
hamming2, hamming3, hamming5, result = tee(_hamming(), 4)
return result
(Note the iter(...) seemed not to be doing anything useful so I
removed them)
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ming(), 4)
return result
PS interesting thread - never heard of Hamming sequences before!
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7;, line)):
do_add(m.value.group(1), m.value.group(2))
elif m.set(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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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]
>
>
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 dependen
use this old trick...
a, b, c = (line+"::").split(':')[: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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t the cost of making it less clear what's going on and having someone
later go "duh, why isn't he using read() here instead" but can't seem to
do much more than that.
Might it be worth providing a way to have file objects seek back to the
current position of the iterator when r
his than:
.>>> inpath = '/tmp/msg.eml'
.>>> infile = open(inpath)
.>>> initer = iter(infile)
.>>> headers = []
.>>> for line in initer:
if not line.strip():
break
headers.append(tuple(line.split(':',1)))
.&
Note that some of these are being worked on at sourceforge just like
python.
Surely 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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ct:
> >> do_stuff(name)
>
> Any help, pointers, sketches or outline of solution would be greatly
> appreciated.
I'm not really able to grasp what you're trying to do (but others
might). It wouldn't hurt if you could post a description of what you're
actually trying to achieve - /why/ you want 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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).
> Python is pretty stable, so it's usually best to suspect our own code
> unless you're heavily into using the C API (which I'm not, so feel free
> to ignore me).
That's been my experience - stability issues in my Python/C code have
almost always come down to refcounting bugs and/or failing to detect and
handle or propagate an exception.
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LL
(meaning a failure, probably of memory allocation).
I also don't see anything in there to resize the tuple.
http://docs.python.org/api/tupleObjects.html
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n'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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ttp://www.python.org/peps/pep-0289.html
http://docs.python.org/whatsnew/node4.html
http://www.python.org/dev/doc/newstyle/ref/genexpr.html
for details.
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er handy.
I'm not sure how many Python built-in functions 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 comprehensi
s though, personally. I'd want to look
into using a class factory or metaclass to do the job if __getattr__ and
__setattr__ are insufficient or unacceptable.
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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
in xrange(2, len(x))
for offset in xrange(0, len(x) + 1 - subset_size) )
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Why is that?
Its a bug!
http://sourceforge.net/tracker/index.php?func=detail&aid=720908&group_id=5470&atid=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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can avoid the "sometimes works, sometimes doesn't" fun
of referencing deleted memory by accident.
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Cast5+6, DES, Serpent,
Twofish, TEA, etc. The linux kernel+source surely goes everywhere
python does so I don't think adding strong crypto modules to python is
a problem now-a-days.
AES in the core python library would be very useful and it would
discourage people from writing the
the
Python/C API.
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
I am working on a python project where an object will have a script that
can be edited by the end user: object.script
If the script is a simple one with no functions, I can easily execute it
using:
exec object.script
But if the object script is a bit more complicated, such as the example
belo
e thread per sub-interpreter, or if it can support
multiple sub interpreters in a single thread. Any ideas?
I'm pretty sure it's the former, but it'd be nice to be sure.
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e in the cgi-bin, not public_html, (b)
be flagged executable ("chmod a+x file.py"), and (c) begin with the
line: '#!/usr/bin/env python'
If the server doesn't provide you with CGI (or, strongly preferable,
SCGI or mod_python), you're probably out of luck.
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lice__(0, 0,
> x[1:])))
> or (not x and rest and cur.append(rest.pop(0]
>
> ;-)
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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one obvious way than what we have now.
And then we have iteration
(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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unstable -> testing (and eventually) -> stable.
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2.2.3-10 An interactive high-level object-oriented la
ii python2.3 2.3.4-18 An interactive high-level object-oriented la
ii python2.4 2.4-2 An interactive high-level object-oriented la
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# raise NoMimeError
return t[0]
for f in ("index.php", "index.php3", "prog.cc", "prog.cpp", "flodge.xsl",
"Makefile", "myMakefile", "potato.123"):
print f, detectMimeType(f)
...
prints
index.php applicatio
> or, if you haven't upgraded to 2.4, yet:
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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t;)
> print >>f , """CategoryY = GRIB
> etc.
> """
You mean "os.popen" not "open" I assume? The former opens a pipe to a
command, the latter overwrites the file.
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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x27;t too hard, though the Python/C API does make creating types a
bit cumbersome. (Most of this seems to be because you're playing
pretend-we-have-objects in C, rather than issues specific to the
Python/C API).
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etc.
[sorry not Python related but may solve your problem!]
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(Yes, I know yours isn't Python 2.4 - it doesn't matter).
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in ?
> import readline
> ImportError: No module named readline
>
> I think some paths are screwed up.. can someone take pity on me and give
> me a hand.
I'd say that'll be the same as with Tkinter - you probably 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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t;)[4:6]
['something', 'about']
so if 'x' is your string, the rough equivalent of that awk statement is:
.>>> x_words = x.split()
.>>> print x_words[4], x_words[5]
or perhaps
.>>> print "%s %s" % tuple(x.split()[4:6])
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e-sorting by a different key... but you
didn't know what key was last used for sorting. A stable sort algorithm
means you don't need to care, because the order will be maintained for
you not randomized.
Well, that's several hundred more words than were probably required, but
I hope I made sense.
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e...;-)
Agreed. I prefer to use explicit 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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ckages (providing the ncurses header files and
static libs) installed.
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Apache might well be able to respawn failed subprocesses, it's not
> something that most hosting 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 spec
r not there are trailing path
separators on the input strings. os.path.join can take more than two
arguments, too.
os.path has lots of other handy tools, so I strongly recommend checking
it out.
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a class and make the class own and manage the
C++ object (and pointer to it) that it owns.
Perhaps that's a better solution for you too?
If you want any opinions from folks here about the best way to solve
your problem, you'll probably need to explain a bit more of your problem
- like
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, socket
> 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.
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say something like :
>
> python 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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Craig Ringer
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27;d be interested if you could clarify what you mean there. As far as I
know, the whole file will only be read into memory if you use file.read
() or file.readlines(). If you use an iterator it does internal
readahead, but won't read the lot at once. If you use read() it reads
only what
plication. You'd simply need 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 con
7;not (not A or not B)' I thought I could try something along those lines,
> but can't crack 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
t clear' or
'/usr/bin/clear' on many UNIX systems; no idea about Windows.
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le approach to me, but I'm hardly an expert.
The code's license permits you to do so, and it's hardly worth repeating
the work if you don't have to.
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s, etc.
In my case, its easier to execute snippets as shown above than it is to
worry about the module search path and wrapping things using a Python
module. If you're doing substantial amounts of Python coding for your
module, you'll almost certainly be better off writing a Python module
that uses your C module internally (see PIL for a good example of this).
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oited.
True; 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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et) than Python in this case anyway. This is
probably not the right place.
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's just
a stab in the dark, but perhaps it might be.
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