How would one make a list of the files in the top directory
using os.walk.

I need to pick a random file from said list.

Thanks.

-- Posted on news://freenews.netfront.net - Complaints to news@netfront.net --

maurizio wrote:

As I implied, you can do all this in standard Python "by hand", but
numpy/scipy can definitely make things easier. There's a dependency
cost here (your program needs one or more extra libraries to work), but
if that's no problem in your environment, I'd recommend that approach.

The scipy add-on contains a bunch of things for file i/o; see

http://www.scipy.org/doc/api_docs/SciPy.io.html

for an overview. Since you're reading text files, the "array_import"
module seems to be what you need:

http://www.scipy.org/doc/api_docs/SciPy.io.array_import.html

There are active user communities for both numpy and scipy that can help
you sort out any remaining issues; for details, see:

http://www.scipy.org/Mailing_Lists

Fredrik Lundh wrote:

cut and paste error there: the "cl cl" should be just one "cl", of course.

and just for the record/google, if I

1) don't include the header file, I get

test.cc(5) : error C3861: 'Py_Initialize': identifier not found, even
with argument-dependent lookup

2) attempt to undef the __cplusplus macro, I get

test.cc(1) : warning C4117: macro name '__cplusplus' is reserved,
'#undef' ignored

3) cut and paste declarations from the header files to my own file
instead of including the files, ignoring the extern "C" part, I get

test.obj : error LNK2019: unresolved external symbol "int __cdecl
Py_Finalize(void)" (?Py_Finalize@@YAHXZ) referenced in function _main

which looks pretty similar to the errors posted earlier.

leo davis wrote:

http://twill.idyll.org/

thank you for your answer
actually i've to do some statistics (maximum,minimum,mean,standard
deviation,....) of a file of data in which each column is a particular
type of data. (the file is a tab separated value).
I was trying to do this by using python (usually i work with fortran or
bash, but i'm learning python), that the reason why i tried to use numpy.

Fredrik Lundh wrote:

maurizio wrote:

What kind of file is it? Did you pick numpy because you want to do
matrix operations (beyond just finding a maximum value), or was it just
the first thing you stumbled upon when researching the problem?

A simple pattern for finding the maximum value in a file, using only
plain Python code, is:

max_value = ... some very small value ...
for line in file:
value = ... extract value from line ...
if value > max_value:
max_value = value

If it's not obvious what "some very small value" is, given the range of
data you're working with, you can do

Maurizio wrote...

Give us an example of how your file looks, and what you want to
extract from it, so that we don't have to guess.

Greetings,

skip@pobox.com wrote:

And yes, for the specific art of writing code that others might have to
read, see this short essay:

http://www.perforce.com/perforce/papers/prettycode.html

i tryed to use the module max of numpy,
the problem is that i don't know how to put the column of the file in an
array.
(i'm new in phyton).
anyway if you think there is a better way.....

Fredrik Lundh wrote:

hello,

I'm looking for a way to remove duplicate code.
The problem is this:
In all my modules I've version information,
containing version information, date, author, testconditions etc,
something like this:

Version_Text = [
[ 0.2, '10-02-2008', 'Stef Mientki',
'Test Conditions:', (1,2),
_(0, """
- scaling and offset is set for each individual signal
- Time history window for 1 signal with min/max display
- set attributes for all signals at once
""") ],