On 2/12/2010 12:45 PM, R (Chandra) Chandrasekhar wrote:
Dear Folks,
I have lines of values like so:
14, [25, 105, 104]
10, [107, 106, 162]
21, [26, 116, 165]
I need to sort them in two ways:
(a) By the numeric value of the first column; and
(b) by the sum of the elements of the second item i
On 2/10/2010 1:38 PM, Ethan Furman wrote:
After all is said and done - if you had a truly good grasp of Python, I
might buy your book even if you still had -- ummm -- a less than winning
presence on the mailing list; but right now your understanding is not
worth paying for.
Alf, here's my sug
On 2/10/2010 2:57 PM, Grant Edwards wrote:
On 2010-02-10, pyt...@bdurham.com wrote:
[regardning "picture" output format specifiers]
I was thinking that there was a built-in function for this
common(?) use case
I haven't seen that paradigm since my one-and-only exposure to
COBOL in a class I
On 2/10/2010 10:24 AM, Bruno Desthuilliers wrote:
They didn't break immediately for me -- what am I missing?:
The fact that in the OP's snippet, code inside f's body refers to f by
its name.
Of course! Tx. -John
--
http://mail.python.org/mailman/listinfo/python-list
On 2/10/2010 9:36 AM, Steven D'Aprano wrote:
On Wed, 10 Feb 2010 05:59:41 -0800, Muhammad Alkarouri wrote:
Hi everyone,
What is the simplest way to access the attributes of a function from
inside it, other than using its explicit name? In a function like f
below:
def f(*args):
f.args = a
On 2/6/2010 6:48 AM, Steven D'Aprano wrote:
class MyStaticMethod(object):
"""Emulate built-in staticmethod descriptor."""
def __init__(self, f):
self.f = f
def __get__(self, obj, objtype=None):
return self.f
How about using a function, instead of a class, to imp
On 2/5/2010 11:53 AM, Gerald Britton wrote:
Also, I'm contractually obligated to
admonish you not to "top post".
Contract?
Joke. (I know it's hard to tell.)
At any rate, I proposed the 3-line format specifically because it separates
the data values from the if-then-else machinery, mak
On 2/5/2010 11:26 AM, Gerald Britton wrote:
sure, but it will fit nicely on one line if you like
On Fri, Feb 5, 2010 at 11:22 AM, John Posner wrote:
On 2/5/2010 11:06 AM, Gerald Britton wrote:
[snip]
Last August [1], I offered this alternative:
self.cmd = (cmd.replace
On 2/5/2010 11:06 AM, Gerald Britton wrote:
[snip]
Last August [1], I offered this alternative:
self.cmd = (cmd.replace(r'${ADDR}',ip)
if isinstance(cmd, str) else
cmd)
But it didn't get much love in this forum!
I'd probably go for that one as well though I mig
On 2/5/2010 9:21 AM, mk wrote:
if isinstance(cmd, str):
self.cmd = cmd.replace(r'${ADDR}',ip)
else:
self.cmd = cmd
or
self.cmd = cmd
if isinstance(cmd, str):
self.cmd = cmd.replace(r'${ADDR}',ip)
(lunatic fringe?)
Last August [1], I offered this alternative:
self.cmd = (cmd
> I'm on Python 2.5, but using the updated turtle.py Version 1.0.1 -
24. 9. 2009.
> The following script draws 5 circles, which it is supposed to, but then
> doesn't draw the second turtle which is supposed to simply move forward.
> Any ideas?
Try commenting out this statement:
self.turtle.t
On 1/30/2010 6:08 PM, elsa wrote:
Hello again,
Thanks for the tips r.e random.ranint(). This improved matters
somewhat, however my program is still too slow. If anyone has any
further tips on how to speed it up, they would be much appreciated!
So, I'm calling evolve(L,limit) from the interactiv
On 1/28/2010 6:52 PM, elsa wrote:
Hi guys,
I've got a problem with my program, in that the code just takes too
long to run. Here's what I'm doing. If anyone has any tips, they'd be
much appreciated!
So, say I have a list of lists that looks something like this (I'm
using a list of lists, rather
On 1/28/2010 3:45 PM, Joan Miller wrote:
On 28 ene, 20:34, Joan Miller wrote:
On 28 ene, 20:20, Peter wrote:
On Jan 29, 6:58 am, John Posner wrote:
On 1/28/2010 2:24 PM, Joan Miller wrote:
On 28 ene, 19:16, Josh Hollandwrote:
On 2010-01-28, Joan Millerwrote:
I've to
On 1/28/2010 2:24 PM, Joan Miller wrote:
On 28 ene, 19:16, Josh Holland wrote:
On 2010-01-28, Joan Miller wrote:
I've to call to many functions with the format:
run("cmd")
Check the docs on os.system().
No. I've a function that uses subprocess to run commands on the same
shell and so s
On 1/28/2010 10:50 AM, evilweasel wrote:
I will make my question a little more clearer. I have close to 60,000
lines of the data similar to the one I posted. There are various
numbers next to the sequence (this is basically the number of times
the sequence has been found in a particular sample).
On 1/26/2010 9:22 AM, Jean-Michel Pichavant wrote:
John Posner wrote:
On 1/26/2010 8:43 AM, Jean-Michel Pichavant wrote:
Hello,
Does anyone using pylint knows a way to make pylint ignore these
'missing docstring' warnings when the base class version of the method
actually d
On 1/26/2010 8:43 AM, Jean-Michel Pichavant wrote:
Hello,
Does anyone using pylint knows a way to make pylint ignore these
'missing docstring' warnings when the base class version of the method
actually defines the docstring ?
'Cause my doc builder (epydoc) handle it properly and propagate
docst
On 1/22/2010 7:17 AM, Gilles Ganault wrote:
Hello
I use a dictionary to keep a list of users connected to a web site.
To avoid users from creating login names that start with digits in
order to be listed at the top, I'd like to sort the list differently
every minute so that it'll start with the
On Fri, 08 Jan 2010 14:28:57 -0500, MRAB
wrote:
Dave McCormick wrote:
On Wed, Jan 6, 2010 at 9:18 AM, John Posner <mailto:jjpos...@optimum.net>> wrote:
On Tue, 05 Jan 2010 16:54:44 -0500, Dave McCormick
mailto:mackrac...@gmail.com>> wrote:
But it is not wh
On Wed, 06 Jan 2010 17:47:37 -0500, Zabin wrote:
On Jan 7, 10:23 am, Zabin wrote:
Hey!
I am new PyQt programmer and want to restrict users to allow only
numeric values into a table and lineedit boxes. I found the
QDoubleValidator class but am unsure as to how to implement it. (I am
a little
On Tue, 05 Jan 2010 16:54:44 -0500, Dave McCormick
wrote:
But it is not what I am wanting. I first thought to make it look for a
space but that would not work when a single character like "#" is to be
colored if there is a "string" of them. Or if all of the characters
between quotes are
On Tue, 05 Jan 2010 15:08:04 -0500, Dave McCormick
wrote:
It's certainly a mistake to use the expression "str(rList).split()".
Using str() to convert the list "rList" into a string creates a mess
that includes square-bracket characters. Did this actually work for you?
It sort of worked
On Tue, 05 Jan 2010 13:12:00 -0500, vsoler wrote:
Hello,
I am acessing an Excel file by means of Win 32 COM technology.
For a given cell, I am able to read its formula. I want to make a map
of how cells reference one another, how different sheets reference one
another, how workbooks reference
On Tue, 05 Jan 2010 10:31:09 -0500, Dave McCormick
wrote:
... But this is what I have so far.
##
file = 'red.txt'
file = open("red.txt","r")
rList = file.readlines()
file.close()
redList = str(rList).split()
Dave, you're doing exactly the right thing: gradually expanding your
No doubt a dumb question from a noob:
The following program (a cut down version of some test code) uses no
CPU, and does not terminate:
import sys
from PyQt4.QtCore import *
if __name__=="__main__":
app = QCoreApplication(sys.argv)
sys.exit(app.exec_())
What is the program doing?
On Fri, 01 Jan 2010 21:01:04 -0500, Cousin Stanley
wrote:
I was not familiar with the re.finditer method
for searching strings ...
Stanley and Dave --
So far, we've just been using finditer() to perform standard-string
searches (e.g. on the word "red"). Since Dave now wants to
On Sat, Jan 2, 2010 at 1:47 PM, Dave McCormick wrote:
WooHoo!!!
I got it!!! Yup, I am sure it can be optimized but it works!!!
Hmmm ... it doesn't work for me ...
RED
for word in redList:
new_Rword(complete, word) def new_Rword(complete, word):
Tbox.tag_remov
On Sat, Jan 2, 2010 at 1:47 PM, Dave McCormick wrote:
WooHoo!!!
I got it!!! Yup, I am sure it can be optimized but it works!!!
Dave, please ignore a couple of my bogus complaints in the previous
message:
... you call function new_Rword() before you define it
... this version also has
On Thu, 31 Dec 2009 11:32:04 -0500, Andreas Waldenburger
wrote:
On Thu, 31 Dec 2009 08:13:35 -0800 (PST) davidj411
wrote:
I am not sure why this behavior is this way.
at beginning of script, i want to create a bunch of empty lists and
use each one for its own purpose.
however, updating one l
On Thu, 31 Dec 2009 10:24:44 -0500, Dave McCormick
wrote:
John,
Thank you for the tips.
I was changing the line-column index to a FLOAT because the search would
return the starting position (pos) of the string, then by making it a
FLOAT and adding the string length I was able to get the en
On Wed, 30 Dec 2009 12:58:06 -0500, Dave McCormick
wrote:
Hi All,
I am new to Python and the list so I hope I am posting this correctly...
I am working on a way to have text automatically formated in a Tkiniter
Text widget and would like some input on my code.
Currently I am using Python
On Tue, 29 Dec 2009 01:35:41 -0500, Steven D'Aprano
wrote:
On Tue, 29 Dec 2009 00:49:50 -0500, John Posner wrote:
On Sun, 27 Dec 2009 09:44:17 -0500, joy99
wrote:
Dear Group,
I am encountering a small question.
Suppose, I write the following code,
input_string=raw_input("PRIN
On Tue, 29 Dec 2009 01:35:41 -0500, Steven D'Aprano
wrote:
On Tue, 29 Dec 2009 00:49:50 -0500, John Posner wrote:
On Sun, 27 Dec 2009 09:44:17 -0500, joy99
wrote:
Dear Group,
I am encountering a small question.
Suppose, I write the following code,
input_string=raw_input("PRIN
On Tue, 29 Dec 2009 01:35:41 -0500, Steven D'Aprano
wrote:
On Tue, 29 Dec 2009 00:49:50 -0500, John Posner wrote:
On Sun, 27 Dec 2009 09:44:17 -0500, joy99
wrote:
Dear Group,
I am encountering a small question.
Suppose, I write the following code,
input_string=raw_input(&qu
On Sun, 27 Dec 2009 09:44:17 -0500, joy99
wrote:
Dear Group,
I am encountering a small question.
Suppose, I write the following code,
input_string=raw_input("PRINT A STRING:")
string_to_word=input_string.split()
len_word_list=len(string_to_word)
if len_word_list>9:
rest_words=
On Sun, 20 Dec 2009 16:59:11 -0500, Zabin wrote:
I am beginner in programming in pyqt. I have been trying to call the
same function from multiple events- but each event results in a
different instance of the function. I am just unable to figure out how
to retrieve the source which calls the fun
On Sat, 19 Dec 2009 19:10:13 -0500, KarlRixon wrote:
Given the following script, I'd expect p1.items to just contain
["foo"] and p2.items to contain ["bar"] but they both contain ["foo",
"bar"].
Why is this? Are object variables not specific to their instance?
---
#!/u
On Fri, 18 Dec 2009 13:00:48 -0500, Alf P. Steinbach
wrote:
Chapter 2 is about Basic Concepts (of programming). It's the usual:
variables, ...
1. Overall suggestion
You have a tendency to include non-pertinent asides [1]. But then,
rambling a bit endows a manuscript with the author's
On Thu, 17 Dec 2009 02:09:03 -0500, Martin P. Hellwig
wrote:
mrstevegross wrote:
Ok, I would like to put together a Python/Tkinter dialog box that
displays a simple message and self-destructs after N seconds. Is there
a simple way to do this?
Thanks,
--Steve
Just, thinking aloud, I proba
On Wed, 02 Dec 2009 13:34:11 -0500, Carsten Haese
wrote:
With string interpolation, you don't need to do that, either.
'%*d' % (8,456)
' 456'
Thanks, Carsten and Mark D. -- I'd forgotten about the use of "*" in
minimum-field-width specs and precision specs (doh). How about this:
On Wed, 02 Dec 2009 10:55:23 -0500, Mark Summerfield
wrote:
On Dec 1, 2:03 pm, Mark Summerfield wrote:
I've produced a 4 page document that provides a very concise summary
of Python 2<->3 differences plus the most commonly used new Python 3
features. It is aimed at existing Python 2 program
On Sun, 29 Nov 2009 22:03:09 -0500, tuxsun wrote:
I've been working in the shell on and off all day, and need to see if
a function I defined earlier is defined in the current shell I'm
working in.
Is there a shell command to get of list of functions I've defined?
How about this:
#
King wrote:
class MyFloat(object):
def __init__(self, value=0.):
self.value = value
def set(self, value):
self.value = value
def get(self):
return self.value
class MyColor(object):
def __init__(self, value=(0,0,0)):
self.value = (MyFloat(value[0
Robert P. J. Day said:
the ubiquitous sieve of eratosthenes requires you to pre-specify
your maximum value, after which -- once the sieve completes -- all you
know is that you have all of the prime numbers up to n. whether
you'll have 1000 of them isn't clear, which means that you might have
t
Ronn Ross wrote:
I'm attempting to add a menu bar to my Tkinter app. I can't figure out the
correct syntax. Can someone help? I get this error when I run the app:
Traceback (most recent call last):
File "tkgrid.py", line 26, in
app = App(root)
File "tkgrid.py", line 10, in __init__
linda.s wrote:
When I click "quit" button, why the following code has problem?
from Tkinter import *
colors = ['red', 'green', 'yellow', 'orange', 'blue', 'navy']
def gridbox(parent):
r = 0
for c in colors:
l = Label(parent, text=c, relief=RIDGE, width=25)
e = Entry(pa
[resend, with Subject line corrected and formatting crud deleted]
Mensanator wrote:
That's interesting. If string.splitfields(delim) was equivalent to
str.split(sep), it would have been useful to add the phrase
"str.split(sep) is equivalent to the old string.splitfields(delim)
which no longer ex
Mensanator wrote:
That's interesting. If string.splitfields(delim) was equivalent to
str.split(sep), it would have been useful to add the phrase
"str.split(sep) is equivalent to the old string.splitfields(delim)
which no longer exists." to the docs. That way, a search on
"splitfields" would direc
Carl Banks wrote:
s.split() and s.split(sep) do different things, and there is no string
sep that can make s.split(sep) behave like s.split(). That's not
unheard of but it does go against our typical expectations. It would
have been a better library design if s.split() and s.split(sep) were
d
Mensenator said:
c = '001110'
c.split('0')
['', '', '1', '', '', '', '11', '']
Ok, the consecutive delimiters appear as empty strings for
reasons unknown (except for the first one). Except when they
start or end the string in which case the first one is included.
Maybe there's a r
Duncan Booth wrote:
/ class CallableOnlyOnce(object):
/def __init__(self, func):
self.func = func
def __call__(self):
f = self.func
if f:
self.func = None
return f()
/ def callonce(func):
/ return CallableOnlyOnce(func)
/ @callonce
/
If you can enumerate the language of possible inputs you could
generate a unique binary representation. Against a language of size
l that would only take you O(l*n) to build the repr for a dict
and for certain repr sizes the comparison could be O(1), making
the entire operation O(l*n+l*m) vs O(n
def cb12(): return output(c1+'->'+c2)
def cb21(): return output(c2+'->'+c1)
I think these can be simplified, e.g:
def cb12(): output(c1+'->'+c2)
But I'd go with the functools.partial approach. You can save some code
by making output() do more of the work:
#---
Stephen Hansen said:
But http://docs.python.org/tutorial/classes.html says, in Section
9.3 "A First Look at Classes":
When a class definition is entered, a new namespace is created,
and used as the local scope — thus, all assignments to local variables
go into this new name
7stud said:
python ignores the names inside a function when it creates the
function. This "program" will not produce an error:
def f():
print x
python parses the file and creates the function object and assigns the
function object to the variable f. It's not until you execute the
functio
Diez said:
Classes are not scopes.
So the above doesn't work because name resolution inside functions/methods
looks for local variables first, then for the *global* scope. There is no
class-scope-lookup.
But http://docs.python.org/tutorial/classes.html says, in Section 9.3 "A
First Look at
Hi,
i was wondering if there is a syntax alike:
for i in range(10) if i > 5:
print i
You can write
for i in filter(lambda i: i > 5, range(10)):
print i
but
for i in range(10):
if i > 5:
print i
it' better readable, and
for i in range(6,10):
print i
it's e
Diez wrote:
No. I love them. But not if they are so large that they stretch over several
lines (or to many columns).
foo = bar if cond else baz
is more than fine for me. But
foo = I_need_to_do_something_really_complicated_here() if cond else baz
isn't, because one doesn't grasp as easily in
I wonder if it is appropriate to replace the None sentinel with one that is an
instance
of Block() e.g.
size = total - P.BASE
excessblk = Block(size, srccol, carry_button_suppress=True, empty_block=(size
<= 0) )
In this particular case, Richard, I don't think so. The Block class is
an a
My choice would be
excessblk = None
if total > P.BASE:
excessblk = ...
Diez and Jean-Michel,
Ha! Your suggestion above was my *original* coding. It looks like I'm
evolving backwards!
But doesn't it violate the DRY principle? The token "excessblk" appears
twice instead of once.
Than
While refactoring some code, I ran across an opportunity to use a
conditional expression. Original:
if total > P.BASE:
excessblk = Block(total - P.BASE, srccol, carry_button_suppress=True)
else:
excessblk = None
Is there any consensus on how to format a conditional expression that i
Use the iterparse() function of the xml.etree.ElementTree package.
http://effbot.org/zone/element-iterparse.htm
http://codespeak.net/lxml/parsing.html#iterparse-and-iterwalk
Stefan
iterparse() is too big a hammer for this purpose, IMO. How about this:
from xml.etree.ElementTree import E
OK, then why the statements "from turtle import *" in the modules
turtleprocess.py and turtlewidget.py?
Yes, I see that now (he said meekly, too sheepish to complain about
being misled by an unfortunate naming choice).
Tx,
John
--
http://mail.python.org/mailman/listinfo/python-list
Certainly John- although I have not embedded the turtle module at all,
I just wrote my own.
OK, then why the statements "from turtle import *" in the modules
turtleprocess.py and turtlewidget.py?
Tx,
John
--
http://mail.python.org/mailman/listinfo/python-list
... I would also venture to say a key-map
of sorts that is available thru the help menu where one could push an
"Up" button, or a "rotate" button, and have the proper command
inserted in the prompt, and then have the command execute, may also
help make the connections here, a sort of *real* Visu
Andras Szabo wrote:
Hello. I searched the archives but couldn't find a solution to a
problem related to the Entry widget in Tkinter.
When creating a pop-up window in an app, which contains an Entry
widget, I want this widget to contain some default string, to have all
this default string s
There's a working app at http://cl1p.net/tkinter_table_headers/
Thank you for this example. However, one issue to that...
When resizing the window (vertical) then the header moves away
from the table. How can I avoid this with the grid? With "pack"
I now this...
Oops ... packing can be tricky
Hi --
a) Assume I would have some different widgets to add per row. How
do I get the maximum row height?
If you are placing widgets in a table like this:
w.grid(row=a, column=b)
... where the *master* of widget "w" is a Tkinter.Frame named
"table_frm", then you can determine the height
jamieson wrote:
i.e. start out with a window like this:
[1][4][7]
[2][5][8]
[3][6][9]
make the main window larger and end up with this:
[1][6]
[2][7]
[3][8]
[4][9]
[5
Here's a solution, using Label widgets for clarity. The keys are:
* start numbering from zero, not one
* use divmod() on an
Shane Geiger wrote:
if type(el) == list or type(el) is tuple:
A tiny improvement:
if type(el) in (list, tuple):
--
http://mail.python.org/mailman/listinfo/python-list
Stephen Hansen wrote:
I have a feeling this might start one of those uber-massive "pass by
value / reference / name / object / AIEE" threads where everyone goes
around in massive circles explaining how Python uses one or another
parameter passing paradigm and why everyone else is wrong... but..
Duncan Booth wrote:
Tim Chase wrote:
There _are_ cases where it's a useful behavior, but they're rare,
so I don't advocate getting rid of it. But it is enough of a
beginner gotcha that it really should be in the Python FAQ at
www.python.org/doc/faq/general/
That's an excellent idea!
So
uuid wrote:
I am at the same time impressed with the concise answer and
disheartened by my inability to see this myself.
My heartfelt thanks!
Don't be disheartened! Many people -- myself included, absolutely! --
occasionally let a blind spot show in their messages to this list. BTW:
contai
Arnaud Delobelle wrote:
return any( not val for val in value_list )
This is the same as:
return not all(value_list)
Yes, I should have remembered De Morgan's Theorem. Thanks!
-John
--
http://mail.python.org/mailman/listinfo/python-list
jazbees wrote:
> I'm surprised to see that the use of min and max for element-wise
> comparison with lists has not been mentioned. When fed lists of True/
> False values, max will return True if there is at least one True in
> the list, while min will return False if there is at least one False.
Alan G Isaac wrote:
Yes, that's what I am currently doing.
But it seems that that is exactly the kind of thing
we are enabled to avoid with e.g., named fonts.
So I was hoping for an equivalent functionality
for colors. From your answer, I am guessing there
is none.
Not sure this would help, but
Tim Chase wrote:
I will probably leave the lead-in sentence as-is but may
add another sentence specifically covering the case for
an empty iterable.
as one of the instigators in this thread, I'm +1 on this solution.
Thanks for weighing in, Raymond. As long as people are getting in their
last
Scott David Daniels wrote:
Assuming you really are going for "is" comparison, how about:
max(id(x) for x in mylist) == min(id(x) for x in mylist)
It has the advantage that if [id(x) for x in mylist] = [2N, 1N, 3N],
you get the answer you desire.
Oops -- got me! -John
--
http://mail.python
Chris Rebert wrote:
Ah, okay. Then you want:
def all_same(lst):
return len(set(lst)) == 1
def all_different(lst):
return len(set(lst)) == len(lst)
Note that these require all the elements of the list to be hashable.
This solution relies on the object ID -- no hashability required:
Tim Chase wrote:
I still prefer "Return False if any element of the iterable is not
true" or "Return False if any element in the iterable is false"
because that describes exactly what the algorithm does. Granted,
anybody with a mote of Python skills can tell that from the algorithm,
but if you
Duncan Booth wrote:
John Posner wrote:
Do know what in the itertools implementation causes adding a 'if p <=
sqrt(n)' clause to *decrease* performance, while adding a
'takewhile()' clause *increases* performance?
I haven't timed it, but I would guess t
Arnaud Delobelle wrote:
You could do something like this with the help of itertools.ifilter:
prime_gen = ifilter(
lambda n, P=[]: all(n%p for p in P) and not P.append(n),
count(2)
)
Formidable! (both the English and French meanings) This is the most
elegant, Sieve of Eratos
> Peter Otten wrote:
>> Could you explain why you prefer 'contains(belly, beer)'
>> or 'belly.contains(beer)' over 'beer in belly'? The last form may be
a bit
>> harder to find in the documentation, but once a newbie has learned about
>> it he'll find it easy to remember.
andrew cooke wrote:
Hrvoje Niksic wrote:
> if test.contains(item) # would return a Boolean value
>
>> That's a string method, not a function in the string module.
Oops, of course.
import operator
operator.contains('foo', 'o')
That's pretty good, and IMHO a bit better than John Machin's suggestion
Lawrence D'Oliveiro wrote:
> Fine if it only happened once. But it's a commonly-made mistake. At some
> point you have to conclude that not all those people are stupid, there
> really is something wrong with the design.
I think "something wrong with the design" is overstating the case a bit,
an
For what definition of 'did not work'? Seems perfectly fine to me. Just try to
add the lines:
root = Tk()
Try adding a line like this:
root.geometry("400x300+100+75")
... which means: "make the window 400 pixels wide and 300 pixels high,
with the upperleft corner at point (100,75)"
Tim Shannon wrote:
I'm new to python, so keep that in mind.
I have a tk Canvas that I'm trying to draw on, and I want to start my
drawing at an offset (from 0) location. So I can tweak this as I
code, I set this offset as a class level variable:
def ClassName:
OFFSET = 20
def __i
>> > g = (lambda primes = []:
>> > (n for n in count(2) if
>> > (lambda x, primes:
>> > (primes.append(x) or True
>> > if all(x%p for p in primes if p <= sqrt(x))
>> > else False)
>> > )(n, primes)
>> >
Kay Schluehr wrote:
> That's because it is *one* expression. The avoidance of named
> functions makes it look obfuscated or prodigious. Once it is properly
> dissected it doesn't look that amazing anymore.
>
> Start with:
>
> (n for n in count(2) if is_prime(n, primes))
>
> The is_prime function
Kay Schluehr said:
> g = (lambda primes = []:
> (n for n in count(2) \
> if
> (lambda n, primes: (n in primes if primes and
n<=primes[-1] \
> else
> (primes.append(n) or True \
> if all(n%p for p in primes if p <= sqrt(n)) \
>
>> Also, if my code is considered ugly or redundant by this community,
>> can you make suggestions to clean it up?
Python is pretty mature: if you have a simple, generic problem, the chances
are that someone else has already solved it, packaging the solution in a
library (or "module"). For your
Mark Tolonen said:
>> p <= sqrt(n) works a little better :^)
>>
>> -Mark
>>
Right you are -- I found that bug in my last-minute check, and then I forgot
to trannscribe the fix into the email message. Duh -- thanks!
-John
E-mail message checked by Spyware Doctor (6.0.0.386)
Database
Inspired by recent threads (and recalling my first message to Python
edu-sig), I did some Internet searching on producing prime numbers using
Python generators. Most algorithms I found don't go for the infinite,
contenting themselves with "list all the primes below a given number".
Here's a very P
>> > mrkrs_alt2 = filter(lambda b: b > 127 or b in list("\r\n\t"),
block)
>> >
>>
>> Never tested my 'pythonicity', but I would do:
>>
>> def test(b) : b > 127 or b in r"\r\n\t"
Oops! Clearly,
b in "\r\n\t"
is preferable to ...
b in list("\r\n\t")
You do *not* want to u
Dennis Lee Bieber presented a code snippet with two consecutive statements
that made me think, "I'd code this differently". So just for fun ... is
Dennis's original statement or my "_alt" statement more idiomatically
Pythonic? Are there even more Pythonic alternative codings?
mrkrs = [b for b i
Terry Ready said:
>> > My ISP (AT&T/Yahoo) was blocking email from the Python bug-tracker:
"The
>> > sending system has been identified as a source of spam".
>>
>> I hope you were able to suggest to them that that
>> identification must be
>> an error. Frustrating given the spam sources
I said:
>> > My intent was to fix an obvious omission: a special case
>> was discussed in
>> > the "Augmented assignment statements" section, but an
>> almost-identical
>> > special case was omitted from the "Assignment statements" section.
After finally getting registered at bugs.python.o
>> >> We can try to debug this :)
>> >>
>> >> > E-mail message checked by Spyware Doctor (6.0.0.386)
>> >> > Database version:
>> >> 5.12060http://www.pctools.com/en/spyware-doctor-antivirus/
>> >>
>> >> Any chance it's Spyware Doctor or some anti-virus flagging
>> >> the messag
Eric Brunel said:
>> The Tk instance is registered in a hidden variable in the
>> Tkinter module. When
>> you don't specify a master, it'll use the latest created Tk
>> instance one by
>> default. BTW, the latest should be the only one: it is
>> quite unsafe to create
>> several Tk insta
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