What is the best way of doing this in Python?
for (v = n / 2 - 1; v >= 0; v--)
I actually tried Google first, but as far as I can see the only solution would be to use while.
Suppose I have a python object x and a string s, how do I set the attribute s on x? So:
>>> x = SomeObject()
>>> attr = 'myAttr'
>>> # magic goes here
>>> x.myAttr
'magic'
What's the magic? The goal of this, incidentally, is to cache calls to x.__getattr__().
How might one extract all images from a pdf document, at native resolution and format? (Meaning extract tiff as tiff, jpeg as jpeg, etc. and without resampling). Layout is unimportant, I don't care were the source image is located on the page.
I'm using python 2.6 but can use 3.x if required.
thanks
How do I type a floating point infinity literal in python?
I have heard
inf = float('inf')
is non portable. Thus, I have had the following recommended:
inf = 1e400
Is either of these standard, or portable? What is best practice?
I have a Python function that gives back some read-write buffer:
>>> x = h.GetEXlow()
>>> x
<read-write buffer ptr 0xa2b8140, size 2147483647 at 0x8b73f80>
Now I would like to memset the whole buffer content to zero. (The size stated above is obviously wrong, but I can determine the size without problems.) How do I do this?
What tools are available in Python to assist in parsing a context-free grammar?
Of course it is possible to roll my own, but I am looking for a generic tool that can generate a parser for a given CFG.
On Linux, how can I find the default gateway for a local ip address/interface using python?
I saw the question "How to get internal IP, external IP and default gateway for UPnP", but the accepted solution only shows how to get the local IP address for a network interface on windows.
Thanks.
Hi folks,
Can anyone help me out in fitting a gamma distribution in python? Well, I've got some data : X and Y coordinates, and I want to find the gamma parameters that fit this distribution... In the Scipy doc, it turns out that a fit method actually exists but I don't know how to use it :s.. first, in wich format the argument "data" must be, and how can I provide the seconde argument (the parameters) since this what I'm looking for ???
Thanks a lot!
I have created an XML file using python. But the XML declaration has only version info. How can I include encoding with XML declaration like:
<?xml version="1.0" encoding="UTF-8"?>
There are times that I automagically create small shell scripts from Python, and I want to make sure that the filename arguments do not contain non-escaped special characters. I've rolled my own solution, that I will provide as an answer, but I am almost certain I've seen such a function lost somewhere in the standard library. By “lost” I mean I didn't find it in an obvious module like shlex, cmd or subprocess.
Do you know of such a function in the stdlib?
Hi,
I'd like to write some Python unit tests for my Google App Engine. How can I set that up? Does someone happen to have some sample code which shows how to write a simple test?
I have an RRD database, and I want to parse some of the data in it. I found this:
http://pypi.python.org/pypi/PyRRD/0.0.7
but it basically just calls the command line tools (no parsing).
Does anyone know of a library that will actually parse the output of rrdtool dump?
Thanks!
Hi,
My requirement is to search for jpeg images files in a directory using python script and list the file names. Can anyone help me on how to identify jpeg images files.
Thanks in advance...
Consider this Python code for printing a list of comma separated values
for element in list:
print element + ",",
What is the preferred method for printing such that a comma does not appear if element is the final element in the list.
ex
a = [1, 2, 3]
for element in a
print str(element) +",",
output
1,2,3,
desired
1,2,3
I'd like to iterate over a list in Python several (say, 10) elements at a time, processing each slice one by one. I can think of a few ways to do this, but none seems obvious and clean. What is the most Pythonic way to do this?
Total Python newb here. I have a images directory and I need to return the names and urls of those files to a django template that I can loop through for links. I know it will be the server path, but I can modify it via JS. I've tried os.walk, but I keep getting empty results.
Hello.
I'm having a problem with the module subprocess.
I'm running a script from python through:
subprocess.Popen('./run_pythia.sh',shell=True).communicate()
and sometimes it just blocks and it doesn't finish to execute the script. Before I was using .wait() instead of .communicate() but then because of this:
http://dcreager.net/2009/08/06/subprocess-communicate-drawbacks/
I changed to .communicate(). Nevertheless the problem continues.
Can anyone help me?
I am writing a forum in Python. I want to strip input containing the right-to-left mark and things like that. Suggestions? Possibly a regular expression?
Does Python have a pool of all strings and are they (strings) singletons there?
More precise, in the following code one or two strings were created in memory:
a = str(num)
b = str(num)
?
Hi.
Is there any way to control links browser from python?
I need to make some bot, twill don't work on my page, Selenium need's X server.
Maybe other way to do it?
Looking to put together a 3D side-scrolling action platformer. Since this is my first time trying to put together a non-simple adventure game, I'm at a loss for which engine to consider.
I would prefer one that supports scripting in python, since that's my primary language. Without tight controls, the game will suck... so speed is a priority. Cross-platform is also important to me.
Any suggestions?
Hi all,
Is there a cross-platform way of getting the path to the temp directory in Python 2.6?
For example, under Linux that would be /tmp, while under XP C:\Documents and settings\\[user]\Application settings\Temp.
Thanks!