that nothing can ever be patented, because it's all just mathematics?
At what point is there valid, patentable creativity to be found in
combining known elements in previously unknown ways?
Chris Angelico
--
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() is a special method.
The default __getattribute__() implementation consults an object's __dict__.
type.__new__() presumably does an implicit special method lookup for
__init__() behind the scenes.
Hence, your custom __dict__ is bypassed.
Cheers,
Chris
--
http://blog.rebertia.com
--
http://mail.python.org/mailman/listinfo/python-list
ynchronous I/O and
select(), but I couldn't see a way to do that with urllib/urllib2. If
you're using sockets directly, this ought to be an option.
I don't know what's the most Pythonesque option, but if you already
have specific Python code for each of your functions, it
On Sat, Apr 9, 2011 at 12:41 AM, MRAB wrote:
> On 08/04/2011 08:25, Chris Angelico wrote:
> [snip]
>>
>> I don't know what's the most Pythonesque option, but if you already
>> have specific Python code for each of your functions, it's probably
>> goin
On Sat, Apr 9, 2011 at 1:21 AM, km wrote:
> Hi All,
>
> How does python 3.2 fare compared to Java 1.6 in terms of performance ?
> any pointers or observations ?
Hi All,
How do apples compare to oranges in terms of performance?
Chris Angelico
--
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ect forks and follow the child. But I
think that's getting into some serious esoteria that's unlikely to be
of much practical use here.
Chris Angelico
--
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t; [By the way, does anyone know why the number of languages in the shootout
> seems to have dropped drastically?]
Probably related to this:
http://www.reddit.com/r/programming/comments/glvgk/lua_jit_pypy_tracemonkey_python_27_jruby_and/
Cheers,
Chris
--
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"foo")
File "", line 1, in
NameError: name 'foo' is not defined
>>> eval("lambda")
Traceback (most recent call last):
File "", line 1, in
eval("lambda")
File "", line 1
lambda
^
SyntaxError
On Sun, Apr 10, 2011 at 10:54 PM, candide wrote:
> Anyway, passing x as a keyword argument to the bool function appears to be
> very rare : i did a regexp search for about 3 source-code Python files
> (among them official Python source-code, Django, Sphinx, Eric source-code
> and many more sou
could be a simple .HTML file
that you have on your hard disk; otherwise, you may want to consider
another web server that lets you tick which ones to query, and builds
an iframe list from your selections.
Chris Angelico
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uot;).
Feel free to continue discussing the merits of these donations, but it
is definitely substantiable and knowable. Microsoft has money, and
they're prepared to spend it on what they believe in. (My view is that
they believe in positive PR more than they believe in Python or Apache
or w
otal data though.
We use Linux for technological reasons more than anything else.
Windows doesn't give us the power of iptables, for instance.
Chris Angelico
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t; like "update" except that it wouldn't overwrite existing values.
Wouldn't x.updatedefault(y) be pretty much y.update(x) ?
Chris Angelico
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blah, blah: blah, blah: blah, blah: blah}
defaults.update(d) # clobber defaults with specified vals
d = defaults # swap in, assuming not aliased
# if aliased, then instead:
# d.clear()
# d.update(defaults)
if blah is not blah:
d.setdefault(blah, blah)
Cheers,
Chris
--
http://blog.rebertia.com
--
http:
discussion that the return? expr is a
complex one, such that it's well worth evaluating only once (maybe
even has side effects).
Chris Angelico
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On Tue, Apr 12, 2011 at 10:46 AM, Chris Angelico wrote:
> def fac(n):
> return cache[n] or (cache[n]=1 if n<=1 else fac(n-1)*n)
Hmm. The function-call version of dictionary assignment IS legal in an
expression, but it's getting stupid...
def fac(n):
return cache.ge
gt; But hey let's argue the point to death!
That's still not equivalent. "return expr or None" will always
terminate the function. The OP's request was for something which would
terminate the function if and only if expr is non-false.
Chris Angelico
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an idea that is. Inside an if, 'it'
is the value of the condition. Might actually be useful in a few
places.... Naw, I think it's still a stupid idea.
Chris Angelico
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^^^
This trailing " +" *requires* that the lines have trailing spaces. Do
they? Such files typically don't, and your example input doesn't
either (although that may be due to email formatting lossage).
Cheers,
Chris
--
http://blog.rebertia.com
> hhh = open("file_wi
d to use regexes to parse such a simple file format.
Just use str.split() [without any arguments] on each line of the file,
and do the field equality checks yourself; your code will simpler.
Relevant docs: http://docs.python.org/library/stdtypes.html#str.split
Cheers,
Chris
--
http://blog.rebertia.com
--
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X
> version of the page.
I've heard you can drive a web browser using Selenium
(http://code.google.com/p/selenium/ ), have it visit the webpage and
run the JavaScript on it, and then grab the final result.
Cheers,
Chris
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and you're just going to end up with oceans of
slurry, as indeed we have. It's like giving someone a stack of paper
and a [pen] and claiming that that's as good as the latest [New York
Times] bestseller."
IOW, a language is usually better for having such discussions and
having a
ocate a loop, but that method could work too. It
all depends on the actual code being executed. I'd still be in favour
of shor-circuit Or operators for this, although it does cost
readability.
Side point: Interesting that I'm referred to by surname here. Seems
there's a large number o
g a different comedy source for my
references. Sometimes even a python has to get smart...)
Chris Angelico
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On Wed, Apr 13, 2011 at 2:46 AM, luca72 wrote:
> I have pyc file written with python 2.6.5 and i need to return to py
> file, can you give me some ideas tools script etc.
http://www.crazy-compilers.com/decompyle/
Cheers,
Chris
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On Thu, Apr 14, 2011 at 12:03 PM, Ryan Kelly wrote:
> On Thu, 2011-04-14 at 11:46 +1000, Chris Angelico wrote:
>> Wait... so where do the Python experts hang out?
>
> Don't panic, there are plenty of experts here :-)
>
> It's an oft-cited troll complaint t
ich is more popular, Coca-Cola or
Pepsi? Do more people vote Liberal or Labour, Republican or Democrat,
Whig or Tory?
Statisticking is a huge science. Most of it involves figuring out
what's important - anyone can get data, but getting useful information
out of the data takes some work.
Chris Angelico
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h your hosts file (/etc/hosts or
c:\windows\system32\drivers\etc\hosts) instead - just put in an entry
for your client computer and some hostname.
Hope that helps!
Chris Angelico
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On Thu, Apr 14, 2011 at 11:30 PM, Stephen.Wu <[email protected]> wrote:
> Thanks Chris.
> I recheck the logic line by line and I find it is this sentence drag
> speed down : hello_client = Client('http://localhost:7789/?wsdl').
> To initialize a suds.client.Client ins
f people who will
just go "Oh, I need to download something to make this work? Okay.
*click*" - now THAT is the real risk. They don't know (or care)
whether they're getting Adobe Flash Player version 123, or Acrobat
Reader 234, or Java Applet Engine By Bob's Dodgy Coders
On Fri, Apr 15, 2011 at 7:36 AM, Martin Gregorie
wrote:
> I think the only real evil is to set out to make a non-standards-
> compliant server and then design client software that seeks to lock in
> people to your server. FWIW I'm not certain that is anything that MS
> deliberately set out to do.
config. I don't know if other DNS software comes nicely preconfigured
like that, but it should, since nobody ever assigns localhost to be
anything else (imagine the confusion THAT would cause - even if you
set it to something relatively innocuous like 127.0.0.2).
Chris Angelico
--
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ds of Adam Savage: "Am I about to feel really, really stupid?"
Thanks in advance for help... even if it is just "hey you idiot, you
forgot about X"!
Chris Angelico
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hemselves with rusty forks and code using their
own blood, I think it'd be an improvement over the current one. And
from the other end... leaving Flash sites up in my browser is one of
the best ways to destroy my battery life. It sucks... power.
Chris Angelico
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l.)
If not, I think I'll go with:
for i in xrange(1,len(dct)+1):
and otherwise as per OP. Having a check for "if key%d in dct" going
all the way up seems like an odd waste of effort (or maybe I'm wrong
there).
Chris Angelico
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: x != sentinel, seq))
If I understand this code correctly, that's creating generators,
right? It won't evaluate past the sentinel at all?
That might well be what I'm looking for. A bit ugly, but efficient and
compact. And I can bury some of the ugliness away.
Chris Angelico
--
htt
On Fri, Apr 15, 2011 at 6:25 PM, Peter Otten <[email protected]> wrote:
> The initial data structure seems less than ideal. You might be able to
> replace it with a dictionary like
>
> {"Keyword": [value_for_keyword_1, value_for_keyword_2, ...]}
>
> if you try hard enough.
The initial data structur
cs.python.org/library/site.html
Cheers,
Chris
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On Fri, Apr 15, 2011 at 10:52 PM, Steven D'Aprano
wrote:
> On Fri, 15 Apr 2011 13:58:22 +1000, Chris Angelico wrote:
>
>> The dictionary is potentially a lot larger than this particular set of
>> values (it's a mapping of header:value for a row of a user-provided CS
SOAP seems to be pretty well supported but I'm not
finding the same for quick development of REST based services for
exchanging JSON or XML formatted data. This is probably just my n00b
status, but what tools are best for building a simple REST data exchange
API?
Thanks,
Chris
--
ht
On 4/15/11 1:03 PM, Tim Wintle wrote:
On Fri, 2011-04-15 at 12:33 -0400, Chris H wrote:
1. Are you sure you want to use python because threading is not good
due to the Global Lock (GIL)? Is this really an issue for
multi-threaded web services as seems to be indicated by the articles
from a
uot;);
Py_DECREF(locals);
You now own a reference to whatever the Python code put into its
variable "result", in the C variable returned_tuple. Of course, it
might not be a tuple at all, and it might not even be present (in
which case returned_tuple will be NULL). This is a fairly effective
l". But ultimately it's still a "worker thread" /
"interaction thread" model, which is quite a good one. The interaction
thread spends most of its time waiting for the user, maybe waiting for
STDIN, maybe waiting for a GUI event, maybe waiting on some I/O device
(TCP socket
ssh and such). Mastering emacs would definitely take time;
I'm not really sure if I can justify it ("Chris, what did you achieve
this week?" "I learned how to get emacs to make coffee.")...
Chris Angelico
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ne entire
command, but if that command requires a "prefix statement" to set
things up (like initializing a dictionary to empty), that has to be
separate.
Chris Angelico
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On Sun, Apr 17, 2011 at 2:32 AM, Andrea Crotti
wrote:
> That of course is an issue, but since you code in many languages I think
> is really a pretty good investment for your future.
>
> And I don't think that you would be unproductive the first weeks with
> emacs, just a bit slower maybe, and it'
On Sun, Apr 17, 2011 at 3:07 AM, Andrea Crotti
wrote:
> The only language where an IDE like eclipse imho is the only way is
> java, but that is because the language sucks so much that without a
> massive help is impossible to write something in a human time.
(Now OT) I used Eclipse once, and yes
, `True if x else False` conceptually gets compiled down to
`True if bool(x) == 1 else False` (but without doing a run-time lookup
of "bool").
Cheers,
Chris
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programs without a Python interpreter installed.
Chris Angelico
--
http://mail.python.org/mailman/listinfo/python-list
esting procedure."
> -- §5.1 Truth Value Testing in Library Reference
This describes "the standard truth testing procedure". Ideally, this
section would be linked to in bool()'s docs.
Cheers,
Chris
--
http://blog.rebertia.com
--
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On Sun, Apr 17, 2011 at 9:36 AM, Steven D'Aprano
wrote:
> (If the machine is particularly
> simple -- you might be able to exactly simulate a lever in pure
> mathematics, but simulating, say, a nuclear bomb or a dialysis machine in
> mathematics is more of a challenge...)
I can easily model a mas
y conditional returns.
There's not a lot of difference between conditionally returning and
conditionally executing all the code between here and the return,
except that when you string three conditional returns together by your
method, it gets three indentations.
Chris Angelico
--
http:/
crack up laughing in the middle of a church
meeting... Yes! We need text editor instructors.
"Don't forget that you can press F7 to make."
"You could do that more easily with C-x M-c M-butterfly."
Chris Angelico
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integers as strings - REXX manages quite well, and gets some
advantages therefrom. But having an explicit bool type has its
benefits too. Essential? No. Useful? Certainly.
Chris Angelico
--
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On Sun, Apr 17, 2011 at 6:45 PM, Steven D'Aprano
wrote:
> On Sun, 17 Apr 2011 16:21:53 +1200, Gregory Ewing wrote:
>
>> Chris Angelico wrote:
>>
>>> def fac(n):
>>> # attempt to get from a cache
>>> return? cache[n]
>>> # n
day), you need to have a
language-specific interpreter or compiler before you can run it.
Chris Angelico
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It sounds to me like you're trying to pull off a classic buffer
overrun and remote code execution exploit, in someone else's Python
program. And all I have to say is Good luck to you.
ChrisA
--
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such name from within a
method, the following scopes are consulted, in order (ignoring some
subtleties):
1. Local variables
2. Variables in nested functions
3. Global variables
4. Built-ins
For "workarounds" for this, see:
http://mail.python.org/pipermail/python-list/2009-December/1228354.html
As to why Python works this way, I'm not sure. However, one could
cogently argue that this requires you to be more explicit about what
the scope is of the name you're referring to; which set of semantics
you desire in the face of inheritance, monkey-patching, and instance
variable shadowing makes this trickier than you might otherwise think.
Cheers,
Chris
--
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--
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le would write any of:
>
> true = 1; false = 0
> FALSE = 0; TRUE = not FALSE
> True = -1; False = not True
Just as long as someone doesn't use:
true = 1; false = -1
which results in the annoying situation that:
if x == false:
is different from:
if x:
But on the plus side, TheDailyWTF.com is never short of publishable material...
Chris Angelico
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On Mon, Apr 18, 2011 at 11:46 AM, Dave Angel wrote:
>>>> bool = int
>
Any language that allows you to do this is either awesome or
terrifying. Come to think of it, there's not a lot of difference.
Chris Angelico
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On Mon, Apr 18, 2011 at 12:04 PM, Dave Angel wrote:
> On 01/-10/-28163 02:59 PM, Chris Angelico wrote:
>>
>>
>>
>> Sure. In my (somewhat contrived) example of factorials, that's going
>> to be true (apart from 0! = 0); and if the function returns a st
On Mon, Apr 18, 2011 at 2:40 PM, Ned Deily wrote:
> Chris Angelico:
>> Dave Angel:
>> >>>> bool = int
>> Any language that allows you to do this is either awesome or
>> terrifying. Come to think of it, there's not a lot of difference.
>
> Even b
On Sun, Apr 17, 2011 at 9:53 PM, Chris Angelico wrote:
> On Mon, Apr 18, 2011 at 2:40 PM, Ned Deily wrote:
>> Even better:
>> $ python2.7 -c 'False = True; print False'
>> True
>
> http://bofh.ch/bofh/bofh13.html
>
>> Alas:
>> $ python3
On Mon, Apr 18, 2011 at 3:49 PM, Chris Rebert wrote:
>> Pro: You can do anything.
>> Con: You can do anything.
>
> I think someone already beat you to it. They call their invention "Lisp". :-P
Bah! Lisp comes, out of the box, with far too many features! No no no.
I
nate (more C-like) blocking syntax.
>
You can do that with a future directive.
from __future__ import braces
That's two underscores before and after the word "future".
http://docs.python.org/reference/simple_stmts.html#future-statements
Chris Angelico
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On Mon, Apr 18, 2011 at 4:21 PM, wrote:
> Hi Rhodri...
>
>> You do realise that what id() returns is implementation-dependent, don't
>> you? In particular, what IronPython returns isn't an address.
>
> I'm pretty sure I wrote "standard Python" install in one of my replies.
>
> Yeah here it is in
s this mean they need
to be "installed" only under Windows? No. They need to be installed to
be run, it's just that the installer is unzip or tar.
(FYI, we "installed" a new minister in the church's manse a few weeks
ago. Didn't involve anything more than a mv.)
Chr
_injection
If it's just a toy for demonstrative purposes that's fine, but it's
good to be aware of these issues. Check out the library you're using
for database access; it's quite possible that you'll be able to embed
variable references in a different way, and let the library escape
them for you - otherwise, look for some kind of escape_string
function.
Hope that helps!
Chris Angelico
--
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We have an isolation environment in which
we'll be allowing our clients to provide Python scripts - which means
we have to be sure it'll all be safe.
BTW, the point at which it bombs is defined by ulimit/rlimit, unless
you fiddle with the memory allocator. See previous thread on the
subject. :D
Chris Angelico
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rther processing to get exact
> filtered records with MAC addresses I needed
I don't know if it's significant, but if I want to process a command's
output using Python, I'll generally use:
nmap -sP | /path/to/script.py
rather than os.system() and temporary files. YMMV thou
he name or path of the program to
execute; ***this will only work if the program is being given no
arguments.***" (emphasis added)
The system is interpreting the entire command string as the path to an
executable; obviously there's no directory named "ffmpeg -i ", so the
pat
our data up in
XML, send it to the other end, they unpack it and turn it into what
they want. End of XMLness. And if you want anything binary ("hey guys,
here's the icon that I want you to display with this thing", for
instance), it gets messier. Much neater to avoid it altogether.
Chris Angelico
--
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W emacs can be morphed into vi
The emacs-vi wars... where the men were real men, the women were real
women, and vi was just emacs in disguise...
Chris Angelico
--
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IKE '%' + 'value' + '%'" which is perhaps
overkill (it forces the database engine to concatenate three strings),
but at least it's safe.
Chris Angelico
--
http://mail.python.org/mailman/listinfo/python-list
On Tue, Apr 19, 2011 at 4:23 PM, Kushal Kumaran
wrote:
>> if a + b + c + d != 1:
>> raise ValueError("Exactly one of a, b, c or d must be true.")
>>
>
> Unless you're sure all of a, b, c, and d are boolean values, an int
> with a negative value slipping in could result in the sum equaling 1,
>
sometimes you need a simple and well-known algorithm to
demonstrate a language feature with. Maybe we should switch to
Fibonacci instead... Anyone for caramel sauce?
http://www.dangermouse.net/esoteric/chef_fib.html
(As a side point, I have become somewhat noted around the house for
always saying &
(greylist[ip]>time()) + (++spewcnt>10))>=3) // flag this packet as
suspicious
Contrived example as I don't recall any specifics right now, but this
will pick up any packets where three or more of the conditions are
met. Useful only in fairly specific situations, but I don't know of
any w
ace:
from pysqlite2 import dbapi2 as sqlite
With:
import sqlite3 as sqlite
You'll also have to figure out where Firefox's `cookies.sqlite` file
is located on your system.
Cheers,
Chris
--
My compiler is compiling, I swear!
http://blog.rebertia.com
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$ME and $URL are replaced with suitable values. It doesn't
> appear to acutally be "using" the cookies.
http://wwwsearch.sourceforge.net/mechanize/doc.html :
"Firefox since version 3 persists cookies in an sqlite database, which
is not supported by MozillaCookieJar."
Pleas
ete of
this suggestion.]
Have you tried removing line #21 and/or #32?
http://docs.python.org/library/socket.html#socket.socket.shutdown :
"socket.shutdown(how) - Shut down one or both halves of the
connection. [...] Depending on the platform, shutting down one half of
the connection c
the file-from-socket method, and simply using pickle.dumps() and
pickle.loads() to pickle to/from strings; those strings can then be
sent/received over the socket using standard recv/send functions.
Also, Chris Rebert's idea is a good one, and worth trying.
Chris Angelico
--
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On Wed, Apr 20, 2011 at 5:30 AM, Dan Stromberg wrote:
> I played around with it until something worked, and ended up with the
> below. The most significant change was probably using sc.makefile
> instead of s.makefile in the server...
Oh! I didn't notice that in the OP. Yep, that would do it!
C
st a
foreign tragedy. There are destitute persons right near us. Donate NOW
to end the hunger! All donations go 100% to the needy. *
Chris Angelico
* After processing fees and my cut, of course. Hey, these list
advertisements don't come free!
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at a higher level? Presumably there's
a full protocol stack with application data getting wrapped up inside
(ultimately) ethernet frames; can you cut it somewhere else and make,
say, a TCP/IP connection to the remote system?
Chris Angelico
--
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s foo. Yet C can override foo, but A is
> unable to override the instance check.
The difference is in the __special__-ness of the method names in question.
Cheers,
Chris
--
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/1 that picks up all the
IP ranges? That way, the source-IP check wouldn't fail.
Chris Angelico
--
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chine
> is . . . right now an XP Pro but will change to a Windows 7 Pro. I do
> not have a cell for this; I am waiting to see if any solution may
> dictate the cell details.
How does this specifically involve Python at all, pray tell?
Regards,
Chris
--
http://mail.python.org/mailman/listinfo/python-list
casts send to subnets it's not on. That pretty much
> clinches the requirement to use a raw socket. :/
Sounds to me like someone majorly abused IP to do weird things. Looks
like you're stuck doing the same weirdness, in whatever way you can
manage :| Sorry.
Chris Angelico
--
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estrict to that one type
lst=[i for i in lst if i["type"].lower()==type] # Restrict to that one type
If I use the filter() method, the resulting list is completely empty.
If I use the list comprehension, it works perfectly. Oddly, either
version works in the stand-alone interpreter
On Wed, Apr 20, 2011 at 1:10 PM, Chris Angelico wrote:
> type=lst[0]["type"].lower()
>
> lst=filter(lambda x: x["type"].lower()==type,lst) # Restrict to that one type
After posting, I realised that "type" is a built-in identifier, and
did a quick v
On Tue, Apr 19, 2011 at 8:10 PM, Chris Angelico wrote:
> type=lst[0]["type"].lower()
Tangent: Don't call it "type"; you're shadowing the built-in class of
the same name.
Cheers,
Chris
--
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On Wed, Apr 20, 2011 at 1:22 PM, Chris Rebert wrote:
> On Tue, Apr 19, 2011 at 8:10 PM, Chris Angelico wrote:
>
>> type=lst[0]["type"].lower()
>
> Tangent: Don't call it "type"; you're shadowing the built-in class of
> the same name.
By
On Tue, Apr 19, 2011 at 8:23 PM, Chris Angelico wrote:
> On Wed, Apr 20, 2011 at 1:22 PM, Chris Rebert wrote:
>> On Tue, Apr 19, 2011 at 8:10 PM, Chris Angelico wrote:
>>
>>> type=lst[0]["type"].lower()
>>
>> Tangent: Don't call it "t
On Wed, Apr 20, 2011 at 1:45 PM, Chris Rebert wrote:
> Built-ins aren't quite the same as globals, but essentially yes:
Sure. That might explain some of the weirdness, but it doesn't explain
why things were still weird with the variable named posttype. However,
since the list co
terms of tinkering with the
language itself (Python scripting is writing .py files and running
them, Python hacking is grabbing the source, fiddling with it, and
running make). Unfortunately the second sense of the word is the only
one a lot of people know.
Chris Angelico
--
http://mail.python.or
ll. The body of the code has:
if len(lst):
posttype=...
lst=...
No other structural elements to get in the way - unless calling the
code as described is creating one.
Chris Angelico
--
http://mail.python.org/mailman/listinfo/python-list
network
transmission. Also, I like to use a MUD client to test my servers,
ergo textual protocols similar to SMTP. Sure, it may be a tad more
verbose than some, but it's usually easy to parse and verify.
Chris Angelico
--
http://mail.python.org/mailman/listinfo/python-list
sing the php
> exif_read_data function (http://php.net/manual/fr/book.exif.php)
Possibilities:
pyexif - http://pypi.python.org/pypi/pyexif/
pexif - http://pypi.python.org/pypi/pexif/
In the future, try searching PyPI, Python's rough equivalent of Perl's CPAN:
http://pypi.python.org/pyp
c features, but NumPy is the gold standard
for matrix-y stuff in Python:
http://numpy.scipy.org/
And apparently it's even Python 3.1-compatible now; that's quite a feat.
Cheers,
Chris
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http://mail.python.org/mailman/listinfo/python-list
thinking, or I do. And it's usually easier to change me,
except that I use so many languages. :)
Chris Angelico
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http://mail.python.org/mailman/listinfo/python-list
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