Thanks. I will try the SciPy list. It was a bit of a hail mary anyway. Pretty
sure elevated Python types don't actually get their hands dirty with data. ;)
- Original Message -
From: rusi
To: python-list@python.org
Cc:
Sent: Thursday, August 23, 2012 11:01 PM
Subject: Re: Data clean
On Aug 23, 12:52 pm, Fg Nu wrote:
> List folk,
>
> I am a newbie trying to get used to Python. I was wondering if anyone knows
> of web resources that teach good practices in data cleaning and management
> for statistics/analytics/machine learning, particularly using Python.
>
> Ideally, these w
Does a wxPython program not run on 64bit Windows?
I saw this “
wxPython is a cross-platform toolkit. This means that the same program
will run on multiple platforms without modification. Currently
supported platforms are 32-bit Microsoft Windows, most Unix or
unix-like systems, and Macintosh OS
On 08/24/2012 06:35 AM, Marco wrote:
Please, can anyone explain me the meaning of the
"buffering > 1" in the built-in open()?
The doc says: "...and an integer > 1 to indicate the size
of a fixed-size chunk buffer."
Sorry, I get it:
>>> f = open('myfile', 'w', buffering=2)
>>> f._CHUNK_SIZE = 5
Please, can anyone explain me the meaning of the
"buffering > 1" in the built-in open()?
The doc says: "...and an integer > 1 to indicate the size
of a fixed-size chunk buffer."
So I thought this size was the number of bytes or chars, but
it is not:
>>> f = open('myfile', 'w', buffering=2)
>>> f.
On Aug 24, 11:34 am, Chris Angelico wrote:
> On Fri, Aug 24, 2012 at 10:36 AM, Roy Smith wrote:
> > Even id() thinks they're the same thing:
> id(a)
> > 1755402140
> id(globals()["a"])
> > 1755402140
>
> Ah, no. What you have there is actually id(4) and nothing to do with a at all.
Wel
I agree with Madison, think Python is a good choice if you have no
programming experience. It'll teach you Python while also covering
programming fundamentals.
If you have prior programming experience, the Python docs/tutorials should
be enough to get you started.
On Thu, Aug 23, 2012 at 5:56 PM,
On Fri, Aug 24, 2012 at 10:36 AM, Roy Smith wrote:
> In fact, I can even write it that way and everything works:
>
globals()["a"] = 42
a
> 42
>
> Even id() thinks they're the same thing:
>
id(a)
> 1755402140
id(globals()["a"])
> 1755402140
Ah, no. What you have there is actual
In article ,
Evan Driscoll wrote:
> > In fact, Python doesn't have variables not as C or Java programmers
> > would understand the term. What it has instead are references to objects
> > (with names as one kind of reference).
>
> OK, I've seen this said a few times, and I have to ask: what do
On Fri, Aug 24, 2012 at 9:54 AM, Dennis Lee Bieber
wrote:
> On Fri, 24 Aug 2012 08:00:59 +1000, Chris Angelico
> declaimed the following in gmane.comp.python.general:
>
>>
>> But again, that probably doesn't help explain the variables. Unless
>> you've come from (or can at least imagine) an envir
Steven D'Aprano writes:
> No offence to Ben Finney, but I think sometimes he's a bit too eager
> to emphasise the subtle differences between Python and other
> languages, rather than the similarities.
No offense taken.
> Again, context is important:
Indeed. Note that my assertion was in respon
On Fri, Aug 24, 2012 at 5:22 AM, Evan Driscoll wrote:
> In Python--, any time you use a name, you have to prefix it with the
> word 'variable':
> variable x = 4
> print(variable x)
That gets really unwieldy. You should shorten it to a single symbol.
And your language could be called Python Hy
On Fri, Aug 24, 2012 at 3:56 AM, Steven D'Aprano
wrote:
> But name bindings are a kind of variable. Named memory locations are a
> *different* kind of variable. The behaviour of C variables and Python
> variables do not follow the Liskov Substitution Principle -- you can't
> rip out the entire "na
On Fri, Aug 24, 2012 at 4:49 AM, Dennis Lee Bieber
wrote:
> By the time you wrap the equation with a lambda all, named, terms,
> AND supply the named terms after the lambda, you might as well just wrap
> the equation in a plain try/except block.
But closures spare you that hassle.
>>> a=
On 8/23/12 20:17 , Ian Kelly wrote:
...
Well, there you go. There *is* something wrong with having six variables
called 'q'.
Sometimes you don't want only six variables called 'q' but a hundred
of them :-)
def fac(q):
if q < 1 :
return 1
else:
return q
On 23/08/2012 19:33, wxjmfa...@gmail.com wrote:
Le jeudi 23 août 2012 15:57:50 UTC+2, Neil Hodgson a écrit :
wxjmfa...@gmail.com:
Small illustration. Take an a4 page containing 50 lines of 80 ascii
characters, add a single 'EM DASH' or an 'BULLET' (code points> 0x2000),
and you will s
On Thu, Aug 23, 2012 at 12:33 PM, wrote:
>> >>> sys.getsizeof('a' * 80 * 50)
>>
>> > 4025
>>
>> sys.getsizeof('a' * 80 * 50 + '•')
>>
>> > 8040
>>
>>
>>
>> This example is still benefiting from shrinking the number of bytes
>>
>> in half over using 32 bits per character as was the case w
On 08/23/2012 12:56 PM, Steven D'Aprano wrote:
> On Thu, 23 Aug 2012 12:17:03 -0500, Evan Driscoll wrote:
>
>> I definitely *wouldn't* say "Python
>> classes aren't really classes" -- even though (I assert) Python classes
>> are *far* further from Simula-style (/Java/C++) classes than Python
>> va
On Thursday, August 23, 2012 1:29:19 PM UTC-4, Terry Reedy wrote:
> One can start with a set rather than tuple of file names.
> filenames = {"this.txt", "that.txt", "the_other.txt"}
Yeah, that's even cleaner. Just be aware, the set notation above is only
available in (IIRC), 2.7 or abo
Le jeudi 23 août 2012 15:57:50 UTC+2, Neil Hodgson a écrit :
> wxjmfa...@gmail.com:
>
>
>
> > Small illustration. Take an a4 page containing 50 lines of 80 ascii
>
> > characters, add a single 'EM DASH' or an 'BULLET' (code points> 0x2000),
>
> > and you will see all the optimization efforts
On Thu, Aug 23, 2012 at 12:02 PM, Jan Kuiken wrote:
> On 8/23/12 06:11 , Steven D'Aprano wrote:
>
>>> 2) Related to the above, you can infinitely nest scopes. There's nothing
>>> wrong with having six variables called 'q'; you always use the innermost
>>> one. Yes, this can hurt readability
>>
>>
On Thu, 23 Aug 2012 09:49:41 -0700, Aaron Brady wrote:
[...]
> The patch for the above is only 40-60 lines. However it introduces two
> new concepts.
>
> The first is a "linked list", a classic dynamic data structure, first
> developed in 1955, cf. http://en.wikipedia.org/wiki/Linked_list .
> L
On 8/23/12 06:11 , Steven D'Aprano wrote:
2) Related to the above, you can infinitely nest scopes. There's nothing
wrong with having six variables called 'q'; you always use the innermost
one. Yes, this can hurt readability
Well, there you go. There *is* something wrong with having six variabl
On 23/08/12 17:44, Evan Driscoll wrote:
On 08/23/2012 04:19 AM, lipska the kat wrote:
Well we don't want to turn this into a language comparison thread do we,
that might upset too many people but I can't remember ever writing a
method that took an Object as argument, you just can't do that much
On Thu, 23 Aug 2012 12:17:03 -0500, Evan Driscoll wrote:
> I definitely *wouldn't* say "Python
> classes aren't really classes" -- even though (I assert) Python classes
> are *far* further from Simula-style (/Java/C++) classes than Python
> variables are from Java variables.
Well, Python classes
On 8/23/2012 8:28 AM, Roy Smith wrote:
I think you want to end up with something like:
def test_1(self):
"Verify creation of files is possible"
filenames = ("this.txt", "that.txt", "the_other.txt")
for filename in filenames:
f = open(filename, "w")
On Aug 23, 3:11 pm, Peter Otten <__pete...@web.de> wrote:
> Mark Carter wrote:
> > Suppose I want to define a function "safe", which returns the argument
> > passed if there is no error, and 42 if there is one. So the setup is
> > something like:
>
> > def safe(x):
> > # WHAT WOULD DEFINE HERE?
On 8/23/2012 10:43 AM, Jerry Hill wrote:
Personally, when I was learning python I found the idea of python
having names and values (rather than variables and references) to
clear up a lot of my misconceptions of the python object model. I
think it's done the same for other people too, especiall
[I have some things to say to a few people so I'm just putting it all in
one rather than clutter up your email box even more.]
On 08/23/2012 12:33 AM, Chris Angelico wrote:
> [Snip discussion on names vs variables]
>
> Does that sort things out, or just make things more confusing?
>
> ChrisA
I...
On Aug 23, 9:34 am, Steven D'Aprano wrote:
> On Wed, 22 Aug 2012 18:46:43 +0100, lipska the kat wrote:
> > We need to separate out the 'view' from the 'implementation' here. Most
> > developers I know, if looking at the code and without the possibly
> > dubious benefit of knowing that in Python 'e
On Saturday, August 18, 2012 9:28:32 PM UTC-5, Aaron Brady wrote:
> On Saturday, August 18, 2012 5:14:05 PM UTC-5, MRAB wrote:
>
> > On 18/08/2012 21:29, Aaron Brady wrote:
>
> > > On Friday, August 17, 2012 4:57:41 PM UTC-5, Chris Angelico wrote:
>
> > >> On Sat, Aug 18, 2012 at 4:37 AM, Aaron
On 08/23/2012 04:19 AM, lipska the kat wrote:
> Well we don't want to turn this into a language comparison thread do we,
> that might upset too many people but I can't remember ever writing a
> method that took an Object as argument, you just can't do that much with
> an Object.
In the pre-Java-1.
We got burned yesterday by a scenario which has burned us before. We had
multiple copies of a module in sys.path. One (the one we wanted) was in our
deployed code tree, the other was in /usr/local/lib/python/ or some such. It
was a particularly confusing situation because we *knew* we had uni
On Thu, Aug 23, 2012 at 9:11 AM, MRAB wrote:
> Perhaps the solution should've been to just switch between 2/4 bytes instead
> of 1/2/4 bytes. :-)
Why? You don't lose any complexity by doing that. I can see
arguments for 1/2/4 or for just 4, but I can't see any advantage of
2/4 over either of th
On 23/08/2012 14:57, Neil Hodgson wrote:
wxjmfa...@gmail.com:
Small illustration. Take an a4 page containing 50 lines of 80 ascii
characters, add a single 'EM DASH' or an 'BULLET' (code points> 0x2000),
and you will see all the optimization efforts destroyed.
sys.getsizeof('a' * 80 * 50)
40
On Thu, Aug 23, 2012 at 4:59 AM, Jussi Piitulainen
wrote:
> I don't get it either. To me the python-has-no-variables campaigners
> seem confused. As far as I can see, Python can be seen in terms of
> variables bound to (locations containing) values perfectly well, in a
> way that should be quite f
On 23/08/12 14:59, Ben Finney wrote:
lipska the kat writes:
On 23/08/12 05:14, Steven D'Aprano wrote:
I think that's uncalled for.
[…]
Excellent advice as usual, but I'm more than capable of looking after
myself thank you.
As is usual, it's not all about you; Steven is demonstrating that
lipska the kat writes:
> On 23/08/12 14:59, Ben Finney wrote:
> > lipska the kat writes:
> >
> >> On 23/08/12 05:14, Steven D'Aprano wrote:
> >>> I think that's uncalled for.
> > […]
> >
> >> Excellent advice as usual, but I'm more than capable of looking after
> >> myself thank you.
> >
> > As
On 23/08/2012 13:47, wxjmfa...@gmail.com wrote:
This is neither a complaint nor a question, just a comment.
In the previous discussion related to the flexible
string representation, Roy Smith added this comment:
http://groups.google.com/group/comp.lang.python/browse_thread/thread/2645504f459bab
On 23/08/2012 10:05, Mark Carter wrote:
Suppose I want to define a function "safe", which returns the argument passed
if there is no error, and 42 if there is one. So the setup is something like:
def safe(x):
# WHAT WOULD DEFINE HERE?
print safe(666) # prints 666
print safe(1/0) # prints 4
wxjmfa...@gmail.com:
Small illustration. Take an a4 page containing 50 lines of 80 ascii
characters, add a single 'EM DASH' or an 'BULLET' (code points> 0x2000),
and you will see all the optimization efforts destroyed.
sys.getsizeof('a' * 80 * 50)
4025
sys.getsizeof('a' * 80 * 50 + '•')
80
lipska the kat writes:
> On 23/08/12 05:14, Steven D'Aprano wrote:
> > I think that's uncalled for.
[…]
> Excellent advice as usual, but I'm more than capable of looking after
> myself thank you.
As is usual, it's not all about you; Steven is demonstrating that we
require civil behaviour here,
On 2012-08-22, Dennis Lee Bieber wrote:
> On Wed, 22 Aug 2012 01:43:19 -0700 (PDT), Guillaume Comte
> declaimed the following in
> gmane.comp.python.general:
>
>> I've managed to build the IP header. I've put the source and destination
>> addresses in this header but it doesn't change the real so
This is neither a complaint nor a question, just a comment.
In the previous discussion related to the flexible
string representation, Roy Smith added this comment:
http://groups.google.com/group/comp.lang.python/browse_thread/thread/2645504f459bab50/eda342573381ff42
Not only I agree with his sen
On Thu, 23 Aug 2012 12:36:01 +0100, MRAB wrote:
> From what I've tried, it looks like the date can't be a string:
>
> >>> m['Date'] = datetime.datetime.utcnow()
> >>> m['Date']
> 'Thu, 23 Aug 2012 11:33:20 -'
Many thanks - it's even easier!
Waiting for Python 3.3 to become standard!
Helm
In article <6b0299df-bc24-406b-8d69-489e990d8...@googlegroups.com>,
Tigerstyle wrote:
> Hi.
>
> I need help with an assignment and I hope you guys can guide me in the right
> direction.
> [code elided]
> 1. The test_1() method includes code to verify that the test directory
> contains only th
On 23 August 2012 10:05, Mark Carter wrote:
> Suppose I want to define a function "safe", which returns the argument
> passed if there is no error, and 42 if there is one. So the setup is
> something like:
>
> def safe(x):
># WHAT WOULD DEFINE HERE?
>
> print safe(666) # prints 666
> print sa
Hi.
I need help with an assignment and I hope you guys can guide me in the right
direction.
This is the code:
--
"""
Demostration of setUp and tearDown.
The tests do not actually test anything - this is a demo.
"""
import unittest
import tempfile
import shutil
import glob
import
On 23/08/2012 09:30, Helmut Jarausch wrote:
Hi,
in response to a bug report I got the follow helpful comments from R. David
Murray.
Many thanks to him. (Unfortunately, I don't know his email, so I can write him
directly)
To generate an email (with non-ascii letters)
R. David Murray wrote:
On 23/08/2012 09:59, Jussi Piitulainen wrote:
Steven D'Aprano writes:
On Wed, 22 Aug 2012 23:49:17 -0500, Evan Driscoll wrote:
> On 8/22/2012 18:58, Ben Finney wrote:
>> You haven't discovered anything about types; what you have
>> discovered is that Python name bindings are not variables.
>>
>
Laszlo Nagy wrote:
> def safe(deferred, default=42, exception=Exception):
>> ... try:
>> ... return deferred()
>> ... except exception:
>> ... return default
>
> What a beautiful solution! I was wondering if the following would be
> possible:
>
>
> def test(t
On 23/08/2012 12:01, Laszlo Nagy wrote:
def safe(deferred, default=42, exception=Exception):
... try:
... return deferred()
... except exception:
... return default
What a beautiful solution! I was wondering if the following would be
possible:
def test(thing
def safe(deferred, default=42, exception=Exception):
... try:
... return deferred()
... except exception:
... return default
What a beautiful solution! I was wondering if the following would be
possible:
def test(thing, default, *exc_classes):
try:
Mark Carter wrote:
> Suppose I want to define a function "safe", which returns the argument
> passed if there is no error, and 42 if there is one. So the setup is
> something like:
>
> def safe(x):
># WHAT WOULD DEFINE HERE?
>
> print safe(666) # prints 666
> print safe(1/0) # prints 42
>
>
On Thursday, 23 August 2012 10:23:20 UTC+1, Laszlo Nagy wrote:
> On 2012-08-23 11:05, Mark Carter wrote:
> You are very vague. "There is an error" - but what kind of error?
Assume that it doesn't matter.
> In some special cases, this can be a good idea to do.
Those are the cases that I'm inte
On Thu, Aug 23, 2012 at 7:28 PM, Laszlo Nagy wrote:
>> That can work ONLY if the division of 1/0 doesn't raise an exception.
>> This is why the concept of NaN exists; I'm not sure if there's a way
>> to tell Python to return NaN instead of bombing, but it's most likely
>> only possible with floati
On Thu, Aug 23, 2012 at 7:22 PM, Mark Carter wrote:
> OK, so it looks like a solution doesn't exist to the problem as specified. I
> guess it's something that only a language with macros could accommodate.
You're asking for a function to prevent the evaluation of its
arguments from throwing an e
On 2012-08-23 11:05, Mark Carter wrote:
Suppose I want to define a function "safe", which returns the argument passed
if there is no error, and 42 if there is one. So the setup is something like:
def safe(x):
# WHAT WOULD DEFINE HERE?
print safe(666) # prints 666
print safe(1/0) # prints 4
That can work ONLY if the division of 1/0 doesn't raise an exception.
This is why the concept of NaN exists; I'm not sure if there's a way
to tell Python to return NaN instead of bombing, but it's most likely
only possible with floating point, not integer.
For integers, Python will always raise
On Thursday, 23 August 2012 10:16:08 UTC+1, Chris Angelico wrote:
> On Thu, Aug 23, 2012 at 7:05 PM, Mark Carter <> wrote:
> > Suppose I want to define a function "safe", which returns the argument
> > passed if there is no error, and 42 if there is one.
> only possible with floating point, not
On 22/08/12 22:31, Evan Driscoll wrote:
On 08/22/2012 02:45 PM, lipska the kat wrote:
On 22/08/12 20:03, Evan Driscoll wrote:
Second, this concept isn't *so* unfamiliar to you. If I give you the
following Java code:
void foo(Object o) { ... }
looking at this method declaration I can see
On Thu, Aug 23, 2012 at 7:05 PM, Mark Carter wrote:
> Suppose I want to define a function "safe", which returns the argument passed
> if there is no error, and 42 if there is one. So the setup is something like:
>
> def safe(x):
># WHAT WOULD DEFINE HERE?
>
> print safe(666) # prints 666
> pr
Suppose I want to define a function "safe", which returns the argument passed
if there is no error, and 42 if there is one. So the setup is something like:
def safe(x):
# WHAT WOULD DEFINE HERE?
print safe(666) # prints 666
print safe(1/0) # prints 42
I don't see how such a function could be
Steven D'Aprano writes:
> On Wed, 22 Aug 2012 23:49:17 -0500, Evan Driscoll wrote:
>
> > On 8/22/2012 18:58, Ben Finney wrote:
> >> You haven't discovered anything about types; what you have
> >> discovered is that Python name bindings are not variables.
> >>
> >> In fact, Python doesn't have var
Hi,
in response to a bug report I got the follow helpful comments from R. David
Murray.
Many thanks to him. (Unfortunately, I don't know his email, so I can write him
directly)
To generate an email (with non-ascii letters)
R. David Murray wrote:
>>> But even better, so will this:
>>> m = Mes
On 23/08/12 05:14, Steven D'Aprano wrote:
On Thu, 23 Aug 2012 01:19:49 +, Walter Hurry wrote:
On Wed, 22 Aug 2012 18:46:43 +0100, lipska the kat wrote:
Well I'm a beginner
Then maybe you should read more and write less.
I think that's uncalled for. Lipska isn't trolling. He's making
o
[ Virgil Stokes wrote on Wed 22.Aug'12 at 16:34:40 +0200 ]
> On 22-Aug-2012 16:04, Steven D'Aprano wrote:
> > On Tue, 21 Aug 2012 18:36:50 -0700, Anonymous Group wrote:
> >
> >> What books do you recomend for learning python? Preferably free and/or
> >> online.
> > Completely by coincidence, I hav
On 20.08.2012 20:34, Christian Heimes wrote:
> Am 19.08.2012 19:35, schrieb Jan Riechers:
>
> Hello Jan,
>
> we decided against ImageMagick and pgmagick for several reasons. For one
> we were already using FreeImage in other projects (Delphi projects and
> through ctypes binding with FreeImagePy)
On 23/08/12 02:19, Walter Hurry wrote:
On Wed, 22 Aug 2012 18:46:43 +0100, lipska the kat wrote:
Well I'm a beginner
Then maybe you should read more and write less.
Really ? I read all the responses to my posts and learn more from them
in less time than I ever have from reading the 'docume
List folk,
I am a newbie trying to get used to Python. I was wondering if anyone knows of
web resources that teach good practices in data cleaning and management for
statistics/analytics/machine learning, particularly using Python.
Ideally, these would be exercises of the form: here is some hor
On Wednesday, August 22, 2012 3:28:18 AM UTC-7, Kamil Kuduk wrote:
> less file.txt | sed -e "s/\b\([a-z]\{4,\}\)/\u\1/g"
Say what?
Yes, you could do a crazy regex at the Linux prompt. But... will you be able
to retain that insane syntax in your head until the NEXT time you need to write
somet
On Wed, 22 Aug 2012 23:49:17 -0500, Evan Driscoll wrote:
> On 8/22/2012 18:58, Ben Finney wrote:
>> You haven't discovered anything about types; what you have discovered
>> is that Python name bindings are not variables.
>>
>> In fact, Python doesn't have variables – not as C or Java programmers
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