On Saturday, 18 April 2015 08:09:06 UTC+1, wxjm...@gmail.com wrote:
> Le samedi 18 avril 2015 03:19:40 UTC+2, Paddy a écrit :
> > Having just seen Raymond's talk on Beyond PEP-8 here:
> > https://www.youtube.com/watch?v=wf-BqAjZb8M, it reminded me of my own
> > recent
On Saturday, 18 April 2015 03:34:57 UTC+1, Ian wrote:
> On Fri, Apr 17, 2015 at 7:19 PM, Paddy wrote:
> > Having just seen Raymond's talk on Beyond PEP-8 here:
> > https://www.youtube.com/watch?v=wf-BqAjZb8M, it reminded me of my own
> > recent post where I am so
Having just seen Raymond's talk on Beyond PEP-8 here:
https://www.youtube.com/watch?v=wf-BqAjZb8M, it reminded me of my own recent
post where I am soliciting opinions from non-newbies on the relative
Pythonicity of different versions of a routine that has non-simple array
manipulations.
The bl
On Wednesday, 25 February 2015 00:08:32 UTC, Chris Angelico wrote:
> On Wed, Feb 25, 2015 at 10:50 AM, Skip Montanaro
> wrote:
> > Even if/when we get to the point where machines can hold an array of
> > 2**49 elements, I suspect people won't be using straight Python to
> > wrangle them.
>
<>
>
On Tuesday, 11 November 2014 18:07:27 UTC, Ian wrote:
> The example that I posted is one that I recall being brought up on
> this list in the past, but I don't have a link for you.
THanks Ian for your help in this.
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On Tuesday, 11 November 2014 09:07:14 UTC, Ian wrote:
> On Tue, Nov 11, 2014 at 12:44 AM, Paddy wrote:
> > Thanks Ian. The original author states "...and it is sure that the given
> > inputs will give an output, i.e., the inputs will always be valid.", which
> >
On Tuesday, 11 November 2014 06:37:18 UTC, Ian wrote:
> On Mon, Nov 10, 2014 at 8:09 PM, Paddy wrote:
> > On Monday, 10 November 2014 18:45:15 UTC, Paddy wrote:
> >> Hi, I do agree with
> >> Ra
On Monday, 10 November 2014 18:45:15 UTC, Paddy wrote:
> Hi, I do agree with
>Raymond H. about the relative merits of cmp= and key= in
> sort/sorted, but I decided to also not let natural uses of cmp= pass
On Monday, 10 November 2014 19:44:39 UTC, Ian wrote:
> On Mon, Nov 10, 2014 at 12:19 PM, Peter Otten wrote:
> > I'm not sure this works. I tried:
>
> Here's a simpler failure case.
>
> >>> ineq = """f2 > f3
> ... f3 > f1"""
>
> [Previously posted code elided]
>
> >>> greater_thans
> set([('f3
Hi, I do agree with
Raymond H. about the relative merits of cmp= and key= in
sort/sorted, but I decided to also not let natural uses of cmp= pass silently.
In answering this question, http://stackoverflow.com/a/26850434/105
On Aug 11, 8:48 am, Terry Reedy wrote:
> On 8/11/2011 3:19 AM, Paddy wrote:
>
> > We can access nonlocal variables in a function, but if we were to eval/
> > exec the function we cannot set up a nested stack of evironment dicts.
> > We are limited to just two: global an
nt is that there
seems to be no support for nonlocal in eval/exec (unless, trivially,
nonlocal==global).
- Paddy.
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On Tuesday, April 5, 2011 2:16:07 AM UTC+1, harrismh777 wrote:
> Steven D'Aprano wrote:
> > I prefer to consider Python 2.7 and Python 3.x as different dialects of
> > the same language. There are a very few handful of incompatibilities,
> > most of which can be automatically resolved by the 2to3 f
In an extended case when you try and capture how a function works over a range
of inputs, you might want to not assume some relationship between input size
and time, as this mnight limit your ability to change algorithms and still have
acceptable performance.
I.e. instead of this:
input_range
Aha!
Thanks Ian for this new snippet. It is what I will use for my current example.
(But please see my third posting on this too).
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Thanks Ian, Benjamin, and Steven.
I now know why it works as it does.
Thinking about it a little more, Is it reasonable to *expect* partial acts as
it does, rather than this way being an implementation convenience? (That was
written as a straight question not in any way as a dig).
I had though
P.S: Python 3.2!
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t;
>>> fsf1 = partial(fs, f=f1)
>>> fsf1(s)
Traceback (most recent call last):
File "", line 1, in
fsf1(s)
TypeError: fs() got multiple values for keyword argument 'f'
>>> # BUT
>>> fsf1(s=s)
[0, 2, 4, 6]
>>>
Would someone help?
- Thanks in advance, Paddy.
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My thanks.
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t(shutil.copy, 'src2.txt', 'dest2.txt')
e.submit(shutil.copy, 'src3.txt', 'dest3.txt')
e.submit(shutil.copy, 'src3.txt', 'dest4.txt')
Should the last line show a copy of src4.txt rather than src3.txt
going to dest4.txt?
- Paddy.
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On Aug 17, 2:29 am, Raymond Hettinger wrote:
> I would like to see someone post a subclass to the ASPN Cookbook that
> adds a number of interesting, though not common operations. Your
> symmetric_difference() method could be one. A dot_product() operation
> could be another. Elementwise arithm
On Aug 17, 10:47 pm, Paddy wrote:
> On 17 Aug, 02:29, Raymond Hettinger wrote:
>
>
>
> > [Paddy]
>
> > > Lets say you have two *sets* of integers representing two near-copies
> > > of some system, then a measure of their difference could be calculated
>
On 17 Aug, 02:29, Raymond Hettinger wrote:
> [Paddy]
>
> > Lets say you have two *sets* of integers representing two near-copies
> > of some system, then a measure of their difference could be calculated
> > as:
>
> > len(X.symmetric_difference(Y)) / (len(X) +
On 14 Aug, 18:14, Raymond Hettinger wrote:
> On Aug 12, 1:20 pm, Paddy wrote:
>
> > I find myself needing to calculate the difference between two Counters
> > or multisets or bags.
>
> > I want those items that are unique to each bag.
>
> Tell us about your use
On Aug 13, 6:36 am, Steven D'Aprano wrote:
> On Thu, 12 Aug 2010 13:20:19 -0700, Paddy wrote:
> > I find myself needing to calculate the difference between two Counters
> > or multisets or bags.
>
> Is this collections.Counter from Python 3.1? If so, you should say so
>>> (b - c)
Counter({'b': 1})
>>> (c - b)
Counter({'a': 2})
>>> diff
Counter({'a': 2, 'b': 1})
But thought why doesn't this operation appear already as a method of
the class?
- Paddy.
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>
> I suspect that the "inspection" module has your answer, but that it'll be
> bulkier, and much slower than just doing what you're doing already.
>
Hmm.
Yeah, it does appear to be bulky. I don't think it's really any more use
than what I'm doing already.
Why not use the default arguments gimmic
e and create it only if it doesn't exist.
However, typing out .. everytime is
pretty long and susceptible to refactoring issues, so I was wondering if
there was a way in Python that I am missing which allows you to reference
the method that the code is in (like __module__ gives a reference
ht forward; or could do with an example translated to Python 3.x
if it would change a lot from 2.x etc.
Please take a look, I know I know I enjoy being involved.
- Paddy.
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iting the old one.
Not when, as pointed out by uuid, container is not list-like (at least as
far as the sort() method goes).
:)
Paddy
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it keeps accepting input
(and doesn't return) until I press Enter.
My initial thoughts are that a function like C's fgetc would be the
easiest way to do it, but I haven't been able to find an equivalent in
my google search, so I was wondering if anyone here might have some
ideas.
Wha
Thanks for all your replies.
A lot of very strong answers :)
2009/3/26 Mensanator :
> What would you have to do to make this work?
>
x+x+x # expecting [3,6]
> [2, 4, 1, 2]
What's happening is that the call to map() is returning a list object.
So after it calculates the first "x+x", you
ango (seems to be the "biggest"/most used), or something else?
Any other suggestions for a possible "wow" reaction from an audience like that?
Thanks,
Paddy
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Chris Rebert wrote:
On Tue, Mar 17, 2009 at 2:24 PM, Robert Kern wrote:
On 2009-03-17 16:13, Paddy wrote:
We the def statement and the lambda expression. We have the class
statement, but is their an expression to create a class?
Or:
def F(): pass
type(F)
# Is to:
F2 = lambda : none
type
> class O(object): pass
>>> type(O)
>>> # is to:
>>> #
Thanks.
- Paddy.
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2009/2/27 venutaurus...@gmail.com :
> Thanks for the reply,,
> I am trying to use the above application using psexec()in
> command line.But it failed returning the error message
>
> exited with error code 255.
>
> But when I ran the application normally it worked
> fine.Do
Try this as an outline:
script1.py
from subprocess import Popen
if __name__ == '__main__':
scriptname = "script2.py"
Popen("python %s" % scriptname, shell=True)
print "I'm done"
script2.py
from time import sleep
if __name__ == '__main__':
while (True):
y relevant if ALL the people
contributing are being paid by Google to do the work, which I'm pretty
sure is not the case.
There are people are spending lots of personal, unpaid and voluntary
time developing Python.
Paddy
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To do so would be over-generalising and not useful to discussion
I guess it's your pedantry that I'm questioning.
Something like "don't use goto's" works as a GoldenRule because it's
been observed that without it, people start using goto statements in
places where it's not really appropriate.
When you said that "[you] usually shouldn't [use properties] - unless
you have a very compelling reason", your tone implied that properties
are easy to misuse and tend to be.
Not being familiar with properties and seeing them as being pretty
harmless, I was intrigued by this, which is why I asked for an
explanation.
Your explanation seems to show that your tone was likely to be more
personal bias than any real issue with properties.
Paddy
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eal, for it to
described as anything like a "GoldenRule" or to advise against its
overuse.
You use it when its appropriate and don't use it when you it's not,
like any other feature.
Paddy
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2009/2/20 Bruno Desthuilliers :
> Note that while you *can* do direct access to the implementation attribute
> (here, '_A' for property 'A'), you don't *need* to so (and usually shouldn't
> - unless you have a very compelling reason).
Interesting. Why shouldn't you?
I haven't used the property() f
g python's own casting rules (given that you are
trying to emulate the way python behaves? Or, alternatively, using a
regular expression (as Nick Craig-Wood did).
Given these solutions, type-conversion and catching the ValueError
appears, to me, to be correct, the most concise, and the most r
ialised in the module.
Of course, if you try to call that function before the global has been
initialised, python will complain [and rightly so :)]
Paddy
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nd sets and all) in python.
Paddy
2009/2/17 Linuxguy123 :
> How do I do this in Python ?
>
> #
> declare A,B
>
> function getA
>return A
>
> function getB
>return B
>
> function setA(value)
> A = value
>
> functio
2
> -12.34
> .0
> .
> 1 2 3
> 1 . 2
> just text
> """
>
> for test in tests.split( '\n' ):
> print 'test (%0s), isnumber: %1s' % \
> ( test.strip(), isnumber( test ) )
>
>
Their is a good answer given on Rosetta Code here:
http://www.rosettacode.org/wiki/IsNumeric#Python
- Paddy.
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rowing threadds or multiple processes alone when using a poor
underlying algorithm.
I was just exploring different ways of solving a problem on my blog:
http://paddy3118.blogspot.com/2009/02/comparison-of-python-solutions-to.html
(But no parallel solutions were attempted).
Have fun programmi
I wonder where the problem lies?
(For the Table, please see the blog entry).
- Paddy.
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On Aug 23, 2:33 pm, Paddy <[EMAIL PROTECTED]> wrote:
> Hi,
> I am am falling at the first hurdle when trying to access a library
> using ctypes.
>
> I have a file libucdb.so which the file command says is shared object,
> but I cannot get it to load:
>
>
the concept.
> #
>
> Regards
Try and pre-filter your file on a line basis to cut it down , then
apply a further filter on the result.
For example, if you were looking for consecutive SPAM records with the
same Name field then you might first extract only the SPAM records
from the gi
e trees are widely used? Got any references for that?
>
>
I too feel that if Perl had such optimizations as Psyco gives Python
then they would shout about it.
I wonder about the new term and if it fits in the same 'box' as what
Psyco does, for example, who was aware of whose work?
-
-soft/linux/ActivePython-2.5.1.1-linux-x86_64/
lib/pyth=
on2.5/ctypes/__init__.py", line 340, in __init__
self._handle =3D _dlopen(self._name, mode)
OSError: /opt/questasim_6.4/questasim/linux/libucdb.so: cannot open
shared o=
bject file: No such file or directory
>>> ^[[A
File "", line 1
^
SyntaxError: invalid syntax
>>>
- Paddy.
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ve been known to construct multi-line -c arguments using
the bash shell on Unix (as bash supports multi-line quotes),
but creating and then deleting a temporary file saves me from
'quoting hell'.
- Paddy.
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fying parameter (a) with a default value may have unexpected
> consequences
>
> Though it might be interesting to ask a newbie what he expects when warned
> of "unexpected consequences" ;)
>
> Peter
+1 on this.
It seems an obvious think to add to a lint-like tool rather than
burdening core Python.
- Paddy.
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Just wondered if this:
http://arstechnica.com/news.ars/post/20080822-firefox-to-get-massive-javascript-performance-boost.html,
is a new name for what is done by Psyco?
- Paddy.
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gt;>> dummy = tmp()
Traceback (most recent call last):
File "", line 1, in
dummy = tmp()
File "", line 3, in __init__
self._foo
AttributeError: 'tmp' object has no attribute '_foo'
>>>
- Paddy.
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impenetrable.
I am not sure if J attracts good programmers or if learning J
forces you to think about solutions in different or useful ways.
I've learnt A LISP-like language, dabbled with forth & prolog &
constraints - maybe its time to learn J and find out if this
array pro
to think of it as working smarter rather than harder - the
brains a much better muscle :-)
- Paddy.
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lex. You might not have such problems if your VHDL is
all in one library.
- Paddy.
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$a++){
>
> } in Python
>
> Jagan
> Linguist
This might help you generally:
http://wiki.python.org/moin/PerlPhrasebook
- Paddy.
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works a bit more like
> what I currently understand.
>
> Surely some other people have worked with this feature... Are there
> any pages that discuss how it's been useful?
>
> No, I don't want to see an implementation of coroutines. I get that
> one already. :-)
>
&
asic software development
practices for scientists and engineers that can reduce the time they
spend programming by 20-25%. All of the material is open source: it
may be used freely by anyone for educational or commercial purposes,
and research groups in academia and industry are actively encouraged
to adapt it to their needs.
- Paddy.
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On Jul 20, 6:39 pm, <[EMAIL PROTECTED]> wrote:
> Nobody any sensible answers. Too complicated I suppose!
The sensible question was?
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ice when looking for weapons of mass
destruction in Iraq.
- Paddy.
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Craig,
This might be good for a general background on Design Patters in
Python:
http://uk.youtube.com/watch?v=0vJJlVBVTFg
- Paddy.
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On Jul 11, 9:32 pm, John Machin <[EMAIL PROTECTED]> wrote:
> On Jul 11, 11:35 pm, Paddy <[EMAIL PROTECTED]> wrote:
>
>
>
> > On Jul 11, 2:15 pm, antar2 <[EMAIL PROTECTED]> wrote:
>
> > > Hello,
>
> > > I can not find out how to read a
s (3
> columns and 3 rows), so that when I make the print statement list[0]
> [0], that the word pear appears
>
> pear noun singular
> books nouns plural
> table noun singular
>
> Can someone help me?
>
> Thanks
lofl = [line.strip().split() for line in the_opened_file]
On Jul 5, 4:13 pm, Mark Dickinson <[EMAIL PROTECTED]> wrote:
> It seems like an appropriate moment to point out *this* paper:
>
> http://swtch.com/~rsc/regexp/regexp1.html
>
That's the one!
Thanks Mark.
- Paddy.
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On Jul 5, 7:01 am, Peter Otten <[EMAIL PROTECTED]> wrote:
> Paddy wrote:
> > It is not a smarter algorithm that is used in grep. Python RE's have
> > more capabilities than grep RE's which need a slower, more complex
> > algorithm.
>
> So you'r
e core developers.
> So you can either write a patch yourself or use a workaround.
>
> re.search('[^ "=]*/', row) if "/" in row else None
>
> might be good enough.
>
> Peter
It is not a smarter algorithm that is used in grep. Python RE's have
at the proper item in the
> current row? I can't quite visualize how to pull
> the item out of the dictionary.
>
> Thanks
>
> ** Posted fromhttp://www.teranews.com**
Hi Tobiah,
Try this:
arrayofdicts.sort(
key = lambda dictinarray: dictinarray.get(sortkeyname)
)
- Paddy.
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gspot.com/2007/02/unzip-un-needed-in-python.html
- Paddy.
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7;s printf, and
data sequence may be tuple or list. Dictionary may also be used for
data, but it has its own way to specify string formatting since
dictionary is unordered but "indexed" by the dict key.
I have attached a prog I wrote to answer someones elses similar problem.
- Paddy.
ture is wrong, then its the
excecution of the code using the attribute that will find that out so
it is redundant. Best to use EAFP for Duck typing as we trust you know
what it is you are doing.
- Paddy.
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gt; self.fn_name = fn_name
> self.args = args
> self.kwds = kwds
> Thanks,
> Srini
>
> Bollywood, fun, friendship, sports and more. You name it, we have it
> onhttp://in.promos.yahoo.com/groups/bestofyahoo/
Check memory
Create a million
://github.com/tablatom/rubydoctest/wikis/special-directives
- Paddy.
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nywhere similar to the one illustrated
> above.)
>
> TIA!
>
> Kynn
>
> --
> NOTE: In my address everything before the first period is backwards;
> and the last period, and everything after it, should be discarded.
Try:
http://pyxml.sourceforge.net/topics/howto/node26.html
- Paddy.
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do you match nested '[' ... ']' brackets?
- Paddy.
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"try: ... except KeyError:" instead of the "if")
> * list approach: 0.9s
>
> BTW this was inspired by the book "Programming Pearls" I read some
> years ago where a similar approach saved some magnitudes of time
> (using a bit field instead of a list to store reserved/free phone
> numbers IIRC).
>
> Yours,
> Karsten
How does your solution fare against the defaultdict solution of:
d = collections.defaultdict(int)
for u,s in zip(users,score): d[u] += s
- Paddy
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On Jun 13, 12:49 pm, David C. Ullrich <[EMAIL PROTECTED]> wrote:
> On Thu, 12 Jun 2008 12:05:02 -0700 (PDT), Paddy
>
> <[EMAIL PROTECTED]> wrote:
>
> >Iam wondering why the peculiar behavior of map when the function in
> >given as None:
>
> If you start
i in list_ldap if i not in list_current]
> seems to work.
>
> I'm sure there's a way to do it with set objects as well.
> -Steven
>>> list_current = [ "welcome", "search", "done", "result"]
>>> list_ldap = [ "welcome", "hello"]
>>> to_add = set(list_ldap) - set(list_current)
>>> to_add
set(['hello'])
- Paddy.
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On Jun 12, 9:36 pm, "Terry Reedy" <[EMAIL PROTECTED]> wrote:
> "Paddy" <[EMAIL PROTECTED]> wrote in message
>
> news:[EMAIL PROTECTED]
> |
> | Iam wondering why the peculiar behavior of map when the function in
> | given as None:
>
> The &#
On Jun 12, 9:48 pm, Robert Kern <[EMAIL PROTECTED]> wrote:
> Paddy wrote:
> > On looking up map on Wikipedia there is no mention of this special
> > behaviour,
> > So my question is why?
>
> My question is why you are looking up the semantics of Python functi
or nil or... ) as argument.
>
> Diez
Oh no!
Sorry to give that impression. I don't think that map should be like
what Wikipedia says, I was just looking for another example of an
implementation that might mention the behaviour.
I just want to know the thoughts behind this behaviour in the P
l2,l3
('asdf', 'qwertyuip', [0, 1, 2])
>>> map(lambda *x: x, l1,l2,l3) == map(None, l1,l2,l3)
True
>>>
On looking up map on Wikipedia there is no mention of this special
behaviour,
So my question is why?
Thanks, Paddy.
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a few, including:
>
> 1) using a dictionary with a default value
>
> d = collections.defaultdict(lambda: 0)
> d[key] += value
>
<>
> -- Gerhard
This might be faster, by avoiding the lambda:
d = collections.defaultdict(int)
d[key] += value
- Paddy.
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ted string
statement before your function and put the bare essentials in the
function itself. This would leave the def nearer the body of the
function, but I don't know of anyone else that does this.
- Paddy.
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e you should
reconsider your stance? And if you do, then you as a group
might find a more effective way to persuade others to
change.
- Paddy.
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e methods whose docstrings say DO NOT USE EXTERNALLY"
And if they still use them, then they'd be problematic no matter what
language was used.
Customers ey?
Can't live without 'em...
... Actually that's customers Sir!
:-)
- Paddy.
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27;)
match = prog.match(line)
for p in 'p1 p2 p3'.split():
if match.groupdict()[p]:
do_something_for_prog(p)
- Paddy.
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Python then re-
implementing in a language closer to assembler - and this may well be
the quicker way to your goal.
- Paddy.
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On May 19, 8:09 pm, Lou Pecora <[EMAIL PROTECTED]> wrote:
> In article <[EMAIL PROTECTED]>,
> Roel Schroeven <[EMAIL PROTECTED]> wrote:
>
>
>
> > Bruno Desthuilliers schreef:
> > > 1/ being interpreted or compiled (for whatever definition of these
> > > terms) is not a property of a language, but
e result to anything (nor am I even using the result in any
> > way).
>
> > What does everyone think about this? Should list comprehensions be used this
> > way, or should they only be used to actually create a new list that will
> > then be assigned to a variable/returned/etc.?
>
> Why not make the list comp the actual list you are trying to build?
... Because it obscures the intent of the code.
- Paddy.
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t; Any pointers would be appreciated
>
> Thanks,
> Rajarshi
Ciranova uses Python and manages to allow its customers to migrate
their Designs from a proprietary format that dominates the market
using Python: http://www.ciranova.com/index.html
- Paddy.
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http://mail.python.org/mailman/listinfo/python-list
eat and I
will continue to read it, but It is more fun reading and posting to
Python blog-posts via a Google Reader search, than it is c.l.p
Python popularity is a double-edged sword.
- Paddy.
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On May 12, 3:46 pm, Grant Edwards <[EMAIL PROTECTED]> wrote:
> On 2008-05-12, Ben Finney <[EMAIL PROTECTED]> wrote:
>
> > Paddy <[EMAIL PROTECTED]> writes:
>
> >> I've used Fortran and C and so would tend to use either i,j,k as the
> >&
itertools import repeat
> for msg in repeat('hello', 10):
> print msg
I guess I would not go to the trouble of using itertools.repeat unless
it was simplifying/homogenising a larger expression - i.e if it was
part of some functional expression
I've never fealt the need for a separa
our titles a little more descriptive to help
people filter/search on them.
- Paddy.
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ood, as they don't seem to preserve line
> breaks
> properly or append the .py extension, etc. I've Googled for this and
> so far
> it seems it doesn't exist. Anyone know?
Take a look at the crunchy project: http://crunchy.sourceforge.net/
- Paddy.
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http://mail.python.org/mailman/listinfo/python-list
p
>>> for x,y,z in izip(obj1, obj2, obj3):
...print x,y,z
...
C a t
S u m
M e n
>>> for i,x in enumerate(obj1):
...print x, obj2[i], obj3[i]
...
C a t
S u m
M e n
>>> for i in range(len(obj1)):
...print obj1[i], obj2[i], obj3[i]
...
C a t
S u m
On May 9, 6:30 pm, Paddy <[EMAIL PROTECTED]> wrote:
> Hi,
> The wikipedia article on Duck Typing has this criticism section that
> needs a citation:
> (Fron:http://en.wikipedia.org/wiki/Duck_typing#Criticism)
>
> An often cited criticism is this:
> One issue with du
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