What is the function? 3*x*x
What is the minimum? 2
What is the maximum? 5
117.000435
Which, considering that it is supposed to be exactly 117, It's darn
good. Unfortunately, it also takes about
10 seconds to do all that.
Any suggestions? Any advice? TIA
Jacob Schmidt
Jacob,
You can get better acc
On 26 Jan 2005, [EMAIL PROTECTED] wrote:
> The following Python code works correctly; but I can't help but wonder if
> my for loop is better implemented as something else: a list comprehension
> or something else more Pythonic.
[Code]
>
>
> w1 = Water(50,0)
> w2 = Water(50,
There was a discussion about this same question (in the context of graphing a user-supplied
function) just a few weeks ago. My suggestion was to use exec to create a real function object that
you can call directly; you can read it here:
http://mail.python.org/pipermail/tutor/2005-January/034696.h
My guess is that your file is small enough that Danny's two-pass approach will work. You might even
be able to do it in one pass.
If you have enough RAM, here is a sketch of a one-pass solution:
# This will map each result to a list of queries that contain that result
results= {}
# Iterate the fi
There has been alot of talk on this list about using list comprehensions
lately, and this could be one of those useful places. While I don't
have time to experiment with real code, I would suggest changing your
function to look like:
steps = [ min_x + i*delta_x for i in range(steps) ]
totalare
Hi,
I am a new member to this group and relatively to
python.
I have a list with 4 columns and column1 elements are
unique. I wanted to extract unique elements in
column3 and and place the other elements of the column
along with unique elements in column 4 as a tab delim
text.
Table:
col1
On Wed, 26 Jan 2005, Bill Kranec wrote:
> There has been alot of talk on this list about using list comprehensions
> lately, and this could be one of those useful places. While I don't
> have time to experiment with real code, I would suggest changing your
> function to look like:
>
> steps = [
> > There has been alot of talk on this list about using list comprehensions
> > lately, and this could be one of those useful places. While I don't
> > have time to experiment with real code, I would suggest changing your
> > function to look like:
> >
> > steps = [ min_x + i*delta_x for i in r
> 1. Why does the assignment-and-test in one line not allowed in
Python?
> For example, while ((content = fd.readline()) != ""):
Because Guido didn't write it that way? ;-)
And that may have been because it is such a common source of bugs.
So common in fact that many compilers now offer to emit a
> Whether or not it's positive or negative depends on which side of
GMT/UTC
> you are, of course :) Note that the result in is seconds, too:
Which is insane since timezones have nothing to do with time offsets.
Especially at the second level!
Oh well, nothing is perfect!
Alan G.
(Feeling picky
Personally no I don;t think it should be a comprehension.
LCs are for building lists, although they sometimes are
abused for other things, but you do not appear to be
building a list per se. The for loop is clearer IMHO.
> Here's my code:
>
> class Water:
> def __init__(
class Reader:
def __init__(self, filePath=""):
self.dataA=SchemaA()
self.dataB=SchemaB()
...
class SchemaA():
class SchemaB():
You probaly should put the Schema definitions before the Reader
definition. Otherwise what you suggest is absolutely the norm
for O
On Wed, 26 Jan 2005, Srinivas Iyyer wrote:
> I have a list with 4 columns and column1 elements are unique. I wanted
> to extract unique elements in column3 and and place the other elements
> of the column along with unique elements in column 4 as a tab delim
> text.
>
> Table:
>
> col1col2
> If the user must be able to enter in the function, then it would be
better
> to evaluate this once and turn it into some sort of function that
you can
> call inside the loop (it's the eval that is so expensive). How to
do that
> depends a lot on how complex the possible functions can be (if
they
Hello tutors,
This is something I've been trying to figure out for some time. Is
there a way in Python to take a string [say something from a
raw_input] and make that string a variable name? I want to to this so
that I can create class instances on-the-fly, using a user-entered
string as the ins
Thanks everyone!
Kent started the suggestion of making a code object, but everyone else seems
to have worked their way to it.
Beautiful! I only have to call exec once, and it cuts down time
considerably.
Here is the new code.
Jacob Schmidt
Please remind me if I've forgotten anything.
### Start #
On Wed, 26 Jan 2005, Tony Giunta wrote:
> This is something I've been trying to figure out for some time. Is
> there a way in Python to take a string [say something from a raw_input]
> and make that string a variable name?
Hi Tony,
Conceptually, yes: you can collect all those on-the-fly vari
col2_set = sets.Set(col2)
how can I get a uniq elements that repeated several
times:
for item in range(len(list)):
for k in range(len(list)):
if item == k:
if list[item] != k[list]:
print item
First off, this would never work. You are iterating over the s
On Wed, 26 Jan 2005 17:11:59 -0800 (PST), Danny Yoo
<[EMAIL PROTECTED]> wrote:
>
>
> On Wed, 26 Jan 2005, Tony Giunta wrote:
>
> We can use exec() to create dynamic variable names, but it's almost always
> a bad idea. Dynamic variable names make it very difficult to isolate
> where variables a
Greetings all, I'm new to python and thought I'd pop in here for advice.
I've done object oriented design and programmed in perl, java, c++, basic, etc.
I haven't done a lot of development, mostly just glorified oject-oriented scripts.
I'm curious about good tutorial websites and books to buy.
I
On Jan 27, 2005, at 02:09, Jason White wrote:
I'm curious about good tutorial websites and books to buy.
I learned Python (well, the basics thereof -- enough to do useful
stuff on my summer job, anyway ^^) in an afternoon using the official
tutorial that's found somewhere on http://www.python.or
[Jason White]
>> I'm curious about good tutorial websites and books to buy.
[Max Noel]
> I learned Python (well, the basics thereof -- enough to do useful
> stuff on my summer job, anyway ^^) in an afternoon using the official
> tutorial that's found somewhere on http://www.python.org/. It's ver
I also recommend the book "Dive Into Python" - it gets awesome reviews, and
the book is under Creative Commons license, so it's free to download and
distribute.
http://diveintopython.org
I also have the book "Core Python Programming" which is pretty good, and has a
nice way of leaping right
I would like to search filesystem structures using globs on Posix systems from
within Python. I don't see an obvious method to do this with in the standard
modules. What is the preferred way of doing this? Should I just use the find
command or is there a good module out there for searching?
Tha
I too once had trouble remembering (and finding) the name of this
library so here it is.
http://www.tizmoi.net/watsup/intro.html
I have not used it but the documentation by example, seemed to me to
be
approachable.
Tony Meyer wrote:
>There's a Python library for controlling Windows in this sort
Try the os module. I think this should probably get you there.
http://docs.python.org/lib/module-os.html
Miles Stevenson wrote:
>I would like to search filesystem structures using globs on Posix
systems from
>within Python. I don't see an obvious method to do this with in the
standard
>modules
Dear Jacob, thank you for your suggestion.
however, i think my question was not clear. what i
meant to ask in my previous question was, how to know
which elements repeated and how many times they were
repeated.
while my question was flying, i did a small test:
took a list:
>>> a
[1, 1, 2, 3, 4,
Ok. I think I understand and I happen to be up at 1:30 my time so
here
is the solution as I understand the problem. This is a very common
problem and has a fairly easy solution. You can then take
adict.keys()
which returns a list of unique elements. Good Luck
import random
l=[random.randra
Hi:
I am still trying to learn the OOPs side of python.
however, things/circumstances dont seems to stop until
I finish my practise and attaing higher understanding.
may be, i am being pushed by circumstances into the
stream and i am being tested if I can swim efficiently
while I struggle with ba
Srinivas Iyyer said unto the world upon 2005-01-27 01:17:
Dear Jacob, thank you for your suggestion.
however, i think my question was not clear. what i
meant to ask in my previous question was, how to know
which elements repeated and how many times they were
repeated.
while my question was flying
Terry Carroll wrote:
> My goal here is not efficiency of the code, but efficiency in my Python
thinking; so I'll be thinking, for example, "ah, this should be a list
comprehension" instead of a knee-jerk reaction to use a for loop.
as Alan says, list comprehensions, like map should be used to ge
Sean Perry said unto the world upon 2005-01-27 02:13:
And now, for the pedant in me. I would recommend against naming
functions with initial capital letters. In many languages, this implies
a new type (like your Water class). so CombineWater should be combineWater.
Do you mean implies by the domin
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