On Wed, 08 May 2013 04:19:07 -0700, jamadagni wrote:
> I have the below C program spiro.c (obviously a simplified testcase)
> which I compile to a sharedlib using clang -fPIC -shared -o libspiro.so
> spiro.c, sudo cp to /usr/lib and am trying to call from a Python script
> spiro.py using ctypes. H
On Thu, 09 May 2013 05:23:59 +, Steven D'Aprano wrote:
> There is no sensible use-case for creating a file without opening it.
> What would be the point? Any subsequent calls to just about any method
> will fail. Since you have to open the file after creating the file object
> anyway, why m
On Thu, 23 May 2013 17:20:19 +1000, Chris Angelico wrote:
> Aside: Why was PHP's /e regexp option ever implemented?
Because it's a stupid idea, and that's the only requirement for a feature
to be implemented in PHP.
--
http://mail.python.org/mailman/listinfo/python-list
On Sun, 26 May 2013 04:11:56 -0700, Ahmed Abdulshafy wrote:
> I'm having a hard time wrapping my head around short-circuit logic that's
> used by Python, coming from a C/C++ background; so I don't understand why
> the following condition is written this way!>
>
> if not allow_zero and abs(x)
On Mon, 27 May 2013 13:11:28 -0700, Ahmed Abdulshafy wrote:
> On Sunday, May 26, 2013 2:13:47 PM UTC+2, Steven D'Aprano wrote:
>
>> What the above actually tests for is whether x is so small that (1.0+x)
>> cannot be distinguished from 1.0, which is not the same thing. It is
>> also quite arbitrar
On Thu, 30 May 2013 12:07:40 +0300, Jussi Piitulainen wrote:
> I suppose this depends on the complexity of the process and the amount
> of data that produced the numbers of interest. Many individual
> floating point operations are required to be within an ulp or two of
> the mathematically correct
On Thu, 30 May 2013 19:38:31 -0400, Dennis Lee Bieber wrote:
> Measuring 1 foot from the 1000 foot stake leaves you with any error
> from datum to the 1000 foot, plus any error from the 1000 foot, PLUS any
> azimuth error which would contribute to shortening the datum distance.
First, let's
On Fri, 31 May 2013 02:12:58 -0700, BIBHU DAS wrote:
> I am a python novice;request all to kindly bear with me.
>
> fd = open('/etc/file','w')
> fd.write('jpdas')
> fd.close()
>
>
> The above snippet fails with:
> IOError: [Errno 13] Permission denied: '/etc/file'
As it should.
> Any Idea ho
On Sat, 01 Jun 2013 08:44:36 -0700, Νικόλαος Κούρας wrote:
> CalledProcessError: Command '/home/nikos/public_html/cgi-bin/files.py'
> returned non-zero exit status 1
> args = (1, '/home/nikos/public_html/cgi-bin/files.py')
> cmd = '/home/nikos/public_html/cgi-bin/files.py'
>
On Mon, 03 Jun 2013 23:28:21 -0700, nagia.retsina wrote:
> I can't believe Chrome whcih by default uses utf8 chosed iso-8859-1 to
> presnt the filenames.
Chrome didn't choose ISO-8859-1, the server did; the HTTP response says:
Content-Type: text/html;charset=ISO-8859-1
--
http://mail.python
On Tue, 04 Jun 2013 00:58:42 -0700, Νικόλαος Κούρας wrote:
> Τη Τρίτη, 4 Ιουνίου 2013 10:39:08 π.μ. UTC+3, ο
> χρήστης Nobody έγραψε:
>
>> Chrome didn't choose ISO-8859-1, the server did; the HTTP response says:
>> Content-Type: text/html;charset=ISO-8859-1
>
On Thu, 06 Jun 2013 03:55:11 +1000, Chris Angelico wrote:
> The HTTP header is completely out of band. This is the best way to
> transmit encoding information. Otherwise, you assume 7-bit ASCII and start
> parsing. Once you find a meta tag, you stop parsing and go back to the
> top, decoding in th
On Fri, 07 Jun 2013 08:53:03 -0700, letsplaysforu wrote:
> I was planning on making a small 2D game in Python. Are there any
> libraries for this? I know of:
[snip]
There's also Pyglet.
--
http://mail.python.org/mailman/listinfo/python-list
On Sun, 09 Jun 2013 03:44:57 -0700, Νικόλαος Κούρας wrote:
>>> Since 1 byte can hold up to 256 chars, why not utf-8 use 1-byte for
>>> values up to 256?
>
>>Because then how do you tell when you need one byte, and when you need
>>two? If you read two bytes, and see 0x4C 0xFA, does that mean tw
On Tue, 11 Jun 2013 01:50:07 +, Joseph L. Casale wrote:
> I am using Popen to run the exe with communicate() and I have sent stdout
> to PIPE without luck. Just not sure what is the proper way to iterate over
> the stdout as it eventually makes its way from the buffer.
The proper way is:
On Wed, 12 Jun 2013 14:23:49 +0300, Νικόλαος Κούρας wrote:
> So, how many bytes does UTF-8 stored for codepoints > 127 ?
U+..U+007F 1 byte
U+0080..U+07FF 2 bytes
U+0800..U+ 3 bytes
>=U+1 4 bytes
So, 1 byte for ASCII, 2 bytes for other Latin characters, Greek, Cyrillic,
Arabi
On Thu, 13 Jun 2013 12:01:55 +1000, Chris Angelico wrote:
> On Thu, Jun 13, 2013 at 11:40 AM, Steven D'Aprano
> wrote:
>> The *mechanism* of UTF-8 can go up to 6 bytes (or even 7 perhaps?), but
>> that's not UTF-8, that's UTF-8-plus-extra-codepoints.
>
> And a proper UTF-8 decoder will reject "\
On Thu, 13 Jun 2013 01:23:27 +, Steven D'Aprano wrote:
> Python does have a globally-global namespace. It is called "builtins", and
> you're not supposed to touch it. Of course, being Python, you can if you
> want, but if you do, you are responsible for whatever toes you shoot off.
>
> Modify
On Fri, 14 Jun 2013 18:16:05 +0300, Nick the Gr33k wrote:
> My question is why the expr (name and month and year) result in the
> value of the last variable whic is variable year?
For much the same reason that an OR expression returns the first true
value.
"or" and "and" only evaluate as many a
On Fri, 14 Jun 2013 19:30:27 +, Grant Edwards wrote:
> 2. Returning one the objects that result from the evaluation of the
> operands instead of returning True or False.
>
> This is what seems to be confusing him. This is much less common
> than short-circuit evaluation.
FWIW,
On Fri, 14 Jun 2013 16:49:11 +, Steven D'Aprano wrote:
> Unlike Javascript though, Python's idea of truthy and falsey is actually
> quite consistent:
Beyond that, if a user-defined type implements a __nonzero__() method then
it determines whether an instance is true or false. If it implement
On Sat, 15 Jun 2013 03:56:28 +1000, Chris Angelico wrote:
> With a few random oddities:
>
bool(float("nan"))
> True
>
> I somehow expected NaN to be false. Maybe that's just my expectations
> that are wrong, though.
In general, you should expect the behaviour of NaN to be the opposite of
w
On Wed, 19 Jun 2013 23:03:05 +, Joseph L. Casale wrote:
> I am trying to invoke a binary that requires dll's in two places all of
> which are included in the path env variable in windows. When running this
> binary with popen it can not find either, passing env=os.environ to open
> made no dif
On Thu, 04 Jul 2013 13:38:09 +0300, Νίκος wrote:
> So you are also suggesting that what gesthostbyaddr() returns is not
> utf-8 encoded too?
The gethostbyaddr() OS function returns a byte string with no specified
encoding. Python 3 will doubtless try to decode that to a character string
using so
On Wed, 10 Jul 2013 22:57:09 -0600, Jason Friedman wrote:
> Other than using a database, what are my options for allowing two processes
> to edit the same file at the same time? When I say same time, I can accept
> delays.
What do you mean by "edit"? Overwriting bytes and appending bytes are
sim
On Thu, 11 Jul 2013 08:32:34 -0700, Metallicow wrote:
> How do I get the OS System Font Directory(Cross-Platform) in python?
What makes you think the system *has* a system font directory?
In the traditional X11 model, the only program which needs fonts is the X
server, and that can be configured
On Mon, 22 Jul 2013 14:19:57 +0200, Gilles wrote:
> Incidently, how do ISP MTAs find whether the remote MTA is legit or
> running on some regular user's computer?
Look up the IP address in a database. If they don't have a database,
perform a reverse DNS lookup and reject anything which looks like
On Tue, 23 Jul 2013 15:11:43 +0200, Peter Otten wrote:
> The conversion to int introduces a rounding error that accumulates over
> time.
Most floating point calculations introduce a rounding error. If the
calculations are iterated, the error will accumulate.
In general, you want to avoid accumu
On Wed, 04 Jul 2012 20:10:47 -0700, self.python wrote:
> 2. after this, I typed like "cd .." but I/O is already closed so I
> can't do another things..
Don't use .communicate() if you want to keep the child process alive.
Write to p.stdin and read p.stdout and p.stderr.
In general, you'll need t
On Sun, 08 Jul 2012 22:57:56 +0200, Laszlo Nagy wrote:
> Yes, this is much better. Almost perfect. Don't forget to consult your
> system documentation, and check if the rename operation is atomic or not.
> (Most probably it will only be atomic if the original and the renamed file
> are on the same
On Mon, 23 Jul 2012 06:01:23 -0700, Sarbjit singh wrote:
> proc = subprocess.Popen("cp -i a.txt b.txt", shell=True,
> stdin=subprocess.PIPE, stdout=subprocess.PIPE,
> stderr=subprocess.STDOUT,)
> stdout_val, stderr_val = proc.communicate()
> print stdout_val b.txt?
>
> proc.communicate("y")
>
On Fri, 03 Aug 2012 04:49:46 -0700, Subhabrata wrote:
> I am trying to call the values of one function in the another function
> in the following way:
> def func1():
> num1=10
> num2=20
> print "The Second Number is:",num2
> return
>
> def func2():
> num3=num1+num2
>
On Fri, 03 Aug 2012 13:48:08 -0700, Tobiah wrote:
> I have a bunch of classes from another library (the html helpers
> from web2py). There are certain methods that I'd like to add to
> every one of them. So I'd like to put those methods in a class,
> and pass the parent at the time of instantiat
On Mon, 06 Aug 2012 06:32:13 -0700, S.B wrote:
> Does anyone know if it's possible to pickle and un-pickle a file across
> a network socket. i.e: First host pickles a file object and writes the
> pickled file object to a client socket. Second host reads the pickled
> file object from the server so
On Mon, 06 Aug 2012 17:52:31 +0200, Tom P wrote:
> consider a nested loop algorithm -
>
> for i in range(100):
> for j in range(100):
> do_something(i,j)
>
> Now, suppose I don't want to use i = 0 and j = 0 as initial values, but
> some other values i = N and j = M, and I want to
On Mon, 06 Aug 2012 21:02:33 -0700, Larry Hudson wrote:
>> for i in range(N,N+100):
>> for j in range(M,M+100):
>> do_something(i % 100 ,j % 100)
>>
>> Emile
>
> How about...
>
> for i in range(100):
> for j in range(100):
> do_something((i + N) % 100,
On Sun, 19 Aug 2012 14:01:15 -0700, Giacomo Alzetta wrote:
> You can obtain the working directory with os.getcwd().
Maybe. On Unix, it's possible that the current directory no longer
has a pathname. As with files, directories can be "deleted" (i.e.
unlinked) even while they're still in use.
Simi
On Wed, 29 Aug 2012 19:39:15 -0400, Piet van Oostrum wrote:
>> Reading from stdin/a file gets you bytes, and not a string, because
>> Python cannot automagically guess what format the input is in.
>>
> Huh?
Oh, it can certainly guess (in the absence of any other information, it
uses the current l
On Sat, 15 Sep 2012 04:36:00 +, jyoung79 wrote:
> I am working in both OS X Snow Leopard and Lion (10.6.8 and 10.7.4).
> I'm simply wanting to move folders (with their content) from various
> servers to the hard drive and then back to different directories on the
> servers.
>
> I want to
On Sun, 16 Sep 2012 12:40:18 +0200, Hans Mulder wrote:
> But you should get into the habit of using shell=False whenever
> possible, because it is much easier to get it right.
More accurately, you should get into the habit of passing a list as the
first argument, rather than a string.
On Unix-li
On Thu, 20 Sep 2012 23:06:46 +0200, Gelonida N wrote:
> I'd like to implement the equivalent functionality of the unix command
> /usr/bin/which
>
> The function should work under Linux and under windows.
Note that "which" attempts to emulate the behaviour of execvp() etc. The
exec(3) manpage wil
On Fri, 21 Sep 2012 17:29:13 +, Steven D'Aprano wrote:
> The question is, what is the largest integer number N such that every
> whole number between -N and N inclusive can be represented as a float?
>
> If my tests are correct, that value is 9007199254740992.0 = 2**53.
>
> Have I got this r
On Fri, 21 Sep 2012 15:23:41 -0700, Paul Rubin wrote:
> Steven D'Aprano writes:
>> Have I got this right? Is there a way to work out the gap between one
>> float and the next?
>
> Yes, 53-bit mantissa as people have mentioned. That tells you what ints
> can be exactly represented. But, arithme
On Fri, 28 Sep 2012 06:12:35 -0700, 陈伟 wrote:
> what is the difference between st_ctime and st_mtime one is the time of
> last change and the other is the time of last modification, but i can
> not understand what is the difference between 'change' and 'modification'.
st_mtime is updated when th
On Fri, 28 Sep 2012 11:48:23 -0600, Kristen J. Webb wrote:
> NOTE: I am a C programmer and new to python, so can anyone comment
> on what the st_ctime value is when os.stat() is called on Windows?
The documentation[1] says:
st_ctime - platform dependent; time of most recent metadata change o
On Mon, 08 Oct 2012 12:28:43 -0700, mooremathewl wrote:
import itertools
x = [1, 2, 3]
y = list(itertools.chain.from_iterable(('insertme', x[i]) for i in
range(len(x y
> ['insertme', 1, 'insertme', 2, 'insertme', 3]
>>> [i for j in [1,2,3] for i in ('insertme', j)]
On Fri, 12 Oct 2012 12:28:17 -0400, Dave Angel wrote:
> Using bare excepts is almost never a good idea. If it "works" you get no
> clues what went wrong. For example, a typo in source code can trigger a
> bare exception, as can a user typing Ctrl-C. So when you're using bare
> excepts, you hav
On Tue, 16 Oct 2012 08:51:46 -0500, Pradipto Banerjee wrote:
> I am trying to define class, where if I use a statement a = b, then
> instead of "a" pointing to the same instance as "b", it should point to a
> copy of "b", but I can't get it right.
It cannot be done.
Name binding ("variable = val
On Thu, 18 Oct 2012 14:05:58 +0100, andrea crotti wrote:
> Maybe a solution would be to redirect the stderr to file and watch that
> instead..
>
> Or otherwise I could use a thread for each shell command, but I would like
> to avoid head-aches with possible race-conditions..
If you're running mu
On Thu, 18 Oct 2012 14:44:27 +0100, andrea crotti wrote:
> Uhh I see thanks, I guess I'll use the good-old .lock file (even if it
> might have some problems too).
In which case, you don't see. A lock file is also advisory, i.e. it only
affects applications which explicitly check for a lock file.
On Sat, 20 Oct 2012 13:43:16 -0700, Julien Phalip wrote:
> I've noticed that the encoding of non-ascii filenames can be inconsistent
> between platforms when using the built-in open() function to create files.
>
> For example, on a Ubuntu 10.04.4 LTS box, the character u'ş' (u'\u015f')
> gets enc
On Thu, 25 Oct 2012 22:04:52 -0400, Terry Reedy wrote:
> Containment of nan in collection is tested by is, not ==.
AFAICT, it isn't specific to NaN. The test used by .index() and "in"
appears to be equivalent to:
def equal(a, b):
return a is b or a == b
IOW, it always checks
On Sat, 27 Oct 2012 08:56:16 +0200, Thomas Rachel wrote:
> Am 27.10.2012 06:48 schrieb Dennis Lee Bieber:
>
>> I don't know about the more modern calculators, but at least up
>> through my HP-41CX, HP calculators didn't do (binary) "floating
>> point"... They did a form of BCD with a fixed n
On Sat, 27 Oct 2012 07:42:01 -0700, zlchen.ken wrote:
> I have a DLL which written in C language, one of the function is to
> allocate a structure, fill the members and then return the pointer of
> the structure.
>
> After Python called this function, and done with the returned structure,
> I wo
On Thu, 01 Nov 2012 19:16:17 -0700, Richard wrote:
> I create child processes with subprocess.Popen().
> Then I either wait for them to finish or kill them.
> Either way these processes end up as defunct until the parent process
> completes:
> $ ps e
> 6851 pts/5Z+ 1:29 [python]
You need
On Wed, 14 Nov 2012 20:49:19 -0500, Roy Smith wrote:
>> I'm slightly surprised that there's no way with the Python stdlib to
>> point a DNS query at a specific server
>
> Me too, including the "only slightly" part. The normal high-level C
> resolver routines (getaddrinfo/getnameinfo, or even t
On Thu, 15 Nov 2012 20:07:38 -0500, Roy Smith wrote:
>>> gethostbyname() and getaddrinfo() use the NSS (name-service switch)
>> mechanism, which is configured via /etc/nsswitch.conf. Depending upon
>> configuration, hostnames can be looked up via a plain text file
>> (/etc/hosts), Berkeley DB file
On Fri, 16 Nov 2012 13:44:03 -0800, buck wrote:
> When a user agent [browser] would otherwise use a character encoding given
> in the first column [ISO-8859-1, aka latin1] of the following table to
> either convert content to Unicode characters or convert Unicode characters
> to bytes, it must ins
On Sat, 17 Nov 2012 08:56:46 -0800, buck wrote:
>> Given that the only differences between the two are for code points
>> which are in the C1 range (0x80-0x9F), which should never occur in HTML,
>> parsing ISO-8859-1 as Windows-1252 should be harmless.
>
> "should" is a wish. The reality is that
On Mon, 19 Nov 2012 21:45:55 -0800, frednotbob wrote:
> What I'm trying to do is set a persistent state for the levels generated
> by make_map(), so the player can move between floors without generating a
> totally new randomized floor each time.
You need to distinguish between immutable data (e.
On Wed, 21 Nov 2012 03:24:01 -0800, danielk wrote:
>> >>> import sys
>> >>> sys.stdout.encoding
>> 'cp437'
>
> Hmmm. So THAT'S why I am only able to use 'cp437'. I had (mistakenly)
> thought that I could just indicate whatever encoding I wanted, as long as
> the codec supported it.
sys.stdout.enc
On Sun, 25 Nov 2012 04:11:29 -0800, ALeX inSide wrote:
> How to "statically type" an instance of class that I pass to a method of
> other instance?
Python isn't statically typed. You can explicitly check for a specific
type with e.g.:
if not isinstance(arg, SomeType):
raise T
On Thu, 29 Nov 2012 10:09:44 +0100, Thomas Rachel wrote:
> The variant with shell=True is more os.popen()-like, but has security
> flaws (e.g., what happens if there are spaces or, even worse, ";"s in the
> command string?
I think that you're conflating the shell= option with whether the command
On Wed, 28 Nov 2012 04:30:25 -0800, Alasdair McAndrew wrote:
> What I want to know is - what are the current "standard" libraries for
> image processing in Python which are in active development?
NumPy/SciPy.
PIL is fine for loading/saving image files (although if you're using a GUI
toolkit, tha
On Tue, 11 Dec 2012 13:25:36 +, andrea crotti wrote:
> But actually why do I need to move away from the current directory of the
> parent process?
It's not required, it's just "best practice".
Often, the current directory is simply whichever directory it happened to
inherit from the shell wh
On Wed, 02 Jan 2013 00:49:36 +0100, someone wrote:
> In [11]: del format
> ---
> NameError Traceback (most recent call last)
> in ()
> > 1 del format
>
> NameError: name 'format' is not de
On Thu, 17 Jan 2013 07:02:24 -0800, Utpal Sarkar wrote:
> I was assuming that sys.stdout would be referencing the same physical
> stream as iostreams::cout running in the same process, but this doesn't
> seem to be the case.
At startup, it refers to the same FILE* as C's stdout. This initially
sh
On Mon, 21 Jan 2013 07:25:06 -0400, Tom Borkin wrote:
> It opens the first song and hangs on subsequent songs. It doesn't open the
> next song or execute the print until I have closed the first one. I want it
> to open all in the list, one after another, so I have all those songs
> available. Plea
Hi,
I have a class ClientHandler(asyncore.dispatcher_with_send), it was running
fine without calling any of my own classes. But it got following exception when
I called my own class GetMyResponse inside the def handle_read(self). Not sure
why it causes disturbance to asyncore.dispatcher_with_se
Hi,
I have a client program Client.py which has a statement of sockobj.connect(),
the port number 6 is used, so no problem from port permission.
I am puzzled because I can run Client.py from command line in my user account
or apache user account without any problems.
But if I run it from
On Fri, 17 Feb 2012 16:53:00 +0900, Zheng Li wrote:
> def method1(a = None):
> print a
>
> i can call it by
> method1(*(), **{'a' : 1})
>
> I am just curious why it works and how it works?
> and what do *() and **{'a' : 1} mean?
In a function call, an argument consisting of * followed by
On Thu, 16 Feb 2012 17:15:59 -0800, Stodge wrote:
> Does anyone know of a library to generate class definitions in memory,
> at runtime, from XSD or JSON? I know about PyXB, generateDS and some
> others, but they all rely on generating python source files at the
> command line, and then using thos
On Wed, 28 Mar 2012 11:31:21 +0200, Jabba Laci wrote:
> Is the following function correct? Is the input file closed in order?
>
> def read_data_file(self):
> with open(self.data_file) as f:
> return json.loads(f.read())
Yes.
The whole point of being able to use a file as a context m
On Mon, 02 Apr 2012 16:19:05 -0700, Astan Chee wrote:
> and I'm trying to convert this into python and I'm rather stuck with
> pycrypto as there is no example on how to make the public key with a mod
> and exponent (or I've probably missed it).
from Crypto.PublicKey import RSA
mod = long("B99808B
On Wed, 04 Apr 2012 08:14:18 -0400, Roy Smith wrote:
>> And sparse files are really hard to reproduce, at least on Unix: on
>> Linux even the system's cp doesn't guarantee sparseness of the copy (the
>> manual mentions a "crude heuristic").
>
> I imagine the heuristic is to look for blocks of all
On Thu, 05 Apr 2012 23:57:49 -0700, bunslow wrote:
> Okay, I've been trying for days to figure this out, posting on forums,
> Googling, whatever. I have yet to find a solution that has worked for me.
> (I'm using Python 3.2.2, Ubuntu 11.04.) Everything I've tried has led to
> buffered output being
On Thu, 05 Apr 2012 22:28:19 -0700, rusi wrote:
> All this mess would vanish if the string-literal-starter and ender
> were different.
You still need an escape character in order to be able to embed an
unbalanced end character.
Tcl and PostScript use mirrored string delimiters (braces for Tcl,
p
On Fri, 06 Apr 2012 06:22:13 -0700, rusi wrote:
> But are not such cases rare?
They exist, therefore they have to be supported somehow.
> For example code such as:
> print '"'
> print str(something)
> print '"'
>
> could better be written as
> print '"%s"' % str(something)
Not if the text betw
On Fri, 06 Apr 2012 12:21:51 -0700, Dubslow wrote:
> It's just a short test script written in python, so I have no idea how
> to even control the buffering
In Python, you can set the buffering when opening a file via the third
argument to the open() function, but you can't change a stream's buffe
On Sat, 07 Apr 2012 14:15:09 -0700, KRB wrote:
> I would like to be able to pass a list of variables to a procedure, and
> have the output assigned to them.
Use a dictionary or an object.
If the variables are globals (i.e. attributes of the current module), you
can pass the result of globals() i
On Sun, 08 Apr 2012 04:11:20 -0700, Xah Lee wrote:
> Ok no problem. My sloppiness. After all, my implementation wasn't
> portable. So, let's fix it. After a while, discovered there's the
> os.sep. Ok, replace "/" to os.sep, done. Then, bang, all hell
> went lose. Because, the backslash is used as
On Thu, 19 Apr 2012 12:28:50 -0700, dmitrey wrote:
> can I somehow overload operators like "=>", "->" or something like that?
> (I'm searching for appropriate overload for logical implication "if a then
> b")
You cannot create new operators, but you can control how existing
operators work on type
On Mon, 23 Apr 2012 10:01:24 -0700, Paul Rubin wrote:
>> I can't think of a single case where 'is' is ill-defined.
>
> If I can't predict the output of
>
> print (20+30 is 30+20) # check whether addition is commutative print
> (20*30 is 30*20) # check whether multiplication is commutat
On Thu, 26 Apr 2012 11:31:39 -0700, John Nagle wrote:
> I would suggest that "is" raise ValueError for the ambiguous cases.
> If both operands are immutable, "is" should raise ValueError. That's the
> case where the internal representation of immutables shows through.
This breaks one of the m
On Sat, 19 May 2012 11:30:46 +0200, Johannes Bauer wrote:
> import ctypes
> libc = ctypes.cdll.LoadLibrary("/lib64/libc-2.14.1.so")
> print(libc.strchr("abcdef", ord("d")))
In 3.x, a string will be passed as a wchar_t*, not a char*. IOW, the
memory pointed to by the first argument to strchr() wil
On Thu, 24 May 2012 13:22:43 -0700, Scott Siegler wrote:
> is there a way to do something like:
> [(x,y-1), (x,y+1) for zzz in coord_list]
> or something along those lines?
[(xx,yy) for x, y in coord_list for xx, yy in [(x,y-1),(x,y+1)]]
or:
[(x,yy) for x, y in coord_list for yy i
On Sat, 26 May 2012 11:34:19 -0400, Roy Smith wrote:
> The Rasberry Pi certainly looks attractive, but isn't quite available
> today. Can you run Python on an Arduino? Things like
> http://www.embeddedarm.com/products/board-detail.php?product=TS-7250 are
> more than I need, and the $129 price pr
On Wed, 06 Jun 2012 05:50:02 -0700, loial wrote:
> I have a requirement to test the creation time of a file with the current
> time and raise a message if the file is more than 15 minutes old.
>
> Platform is Unix.
>
> I have looked at using os.path.getctime for the file creation time and
> tim
On Thu, 02 Jun 2011 09:54:30 +, Steven D'Aprano wrote:
>> Exceptions allow you to write more natural code by ignoring the awkward
>> cases. E.g. writing "x * y + z" rather than first determining whether "x
>> * y" is even defined then using a conditional.
>
> You've quoted me out of context.
On Fri, 03 Jun 2011 11:43:54 +1200, Gregory Ewing wrote:
>> But going against generally accepted semantics should at least
>> be clearly indicated. Lambda is one of the oldest computing abstraction,
>> and they are at the core of any functional programming language.
>
> Yes, and Python's lambdas
On Fri, 03 Jun 2011 04:30:46 +, Chris Torek wrote:
>>I'm not sure what you mean by "full 16-bit Unicode string"? Isn't
>>unicode inherently 32 bit?
>
> Well, not exactly. As I understand it, Python is normally built
> with a 16-bit "unicode character" type though
It's normally 32-bit on p
On Fri, 03 Jun 2011 02:58:24 +, Chris Torek wrote:
> Python might be penalized by its use of Unicode here, since a
> Boyer-Moore table for a full 16-bit Unicode string would need
> 65536 entries (one per possible ord() value). However, if the
> string being sought is all single-byte values, a
On Fri, 03 Jun 2011 14:52:39 +, Grant Edwards wrote:
>> It's arguable that NaN itself simply shouldn't exist in Python; if
>> the FPU ever generates a NaN, Python should raise an exception at
>> that point.
>
> Sorry, I just don't "get" that argument. I depend on compliance with
> IEEE-754,
On Fri, 03 Jun 2011 22:08:16 +0200, Wilbert Berendsen wrote:
> I find myself all over the place associating objects with each other using
> dicts as caches:
> Are there other peoply using things like this? Is there a solution like
> this in the standard lib that I'm overlooking?
The general con
On Sat, 04 Jun 2011 00:52:17 -0700, rusi wrote:
>> If you're "fluent" in IEEE-754, then you won't find its behaviour
>> unexpected. OTOH, if you are approach the issue without preconceptions,
>> you're likely to notice that you effectively have one exception mechanism
>> for floating-point and ano
On Sat, 04 Jun 2011 13:41:33 +1200, Gregory Ewing wrote:
>> Python might be penalized by its use of Unicode here, since a
>> Boyer-Moore table for a full 16-bit Unicode string would need
>> 65536 entries
>
> But is there any need for the Boyer-Moore algorithm to
> operate on characters?
>
> Seem
On Sat, 04 Jun 2011 05:14:56 +, Steven D'Aprano wrote:
> This fails to support non-ASCII letters, and you know quite well that
> having to spell out by hand regexes in both upper and lower (or mixed)
> case is not support for case-insensitive matching. That's why Python's re
> has a case in
On Sun, 05 Jun 2011 07:21:10 +, Steven D'Aprano wrote:
> Returning a sentinel meaning "an exceptional event occurred" is hardly
> unusual, even in Python. str.find() does is, as does re.search() and
> re.match().
These are not "exceptional" conditions; if they were, an exception would
be us
On Mon, 06 Jun 2011 00:55:18 +, Steven D'Aprano wrote:
> And thus we come back full circle. Hundreds of words, and I'm still no
> closer to understanding why you think that "NAN == NAN" should be an
> error.
Well, you could try improving your reading comprehension. Counselling
might help.
On Mon, 06 Jun 2011 17:40:29 -0700, Eric wrote:
> Is there a library or regex that can determine if a string is a fqdn
> (fully qualified domain name)? I'm writing a script that needs to add
> a defined domain to the end of a hostname if it isn't already a fqdn
> and doesn't contain the defined do
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