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• Python: Pass parameter one time, but use more times

  - by Gabriel L. Oliveira

  I'm trying to do this: commands = { 'py': 'python %s', 'md': 'markdown "%s" "%s.html"; gnome-open "%s.html"', } commands['md'] % 'file.md' But like you see, the commmands['md'] uses the parameter 3 times, but the commands['py'] just use once. How can I repeat the parameter without changing the last line (so, just passing the parameter one time?)

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• default values for variable argument list in Python

  - by deamon

  Is it possible to set a default value for a variable argument list in Python 3? Something like: def do_it(*args=(2, 5, 21)): pass I wonder that a variable argument list is of type tuple but no tuple is accepted here.

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• Can someone explain __all__ in Python?

  - by varikin

  I have been using Python more and more, and I keep seeing the variable __all__ set in different __init__.py files. Can someone explain what this does?

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• Copy an entity in Google App Engine datastore in Python

  - by Gordon Worley

  In a Python Google App Engine app I'm writing, I have an entity stored in the datastore that I need to retrieve, make an exact copy of it (with the exception of the key), and then put this entity back in. How should I do this? In particular, are there any caveats or tricks I need to be aware of when doing this so that I get a copy of the sort I expect and not something else.

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• python: sending information between two scripts

  - by Peter

  I have two Python scripts in two different locations and cannot be moved. What is the best way to send information between the two scripts? say for example in script1.py i had a string e.g. x = 'teststring' then i need variable 'x' passed to script2.py, which saves the variable 'x' to a text file? Any ideas?

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• Accessing relative path in Python

  - by Aaron Hoffman

  Hi, I'm running a Mac OS X environment and am used to using ~/ to provide the access to the current user's directory. For example, in my python script I'm just trying to use os.chdir("/Users/aaron/Desktop/testdir/") But would like to use os.chdir("~/Desktop/testdir/") I'm getting a no such file or directory error when trying to run this. Any ideas?

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• python set difference

  - by user1311992

  I'm doing a set difference operation in Python: from sets import Set from mongokit import ObjectId x = [ObjectId("4f7aba8a43f1e51544000006"), ObjectId("4f7abaa043f1e51544000007"), ObjectId("4f7ac02543f1e51a44000001")] y = [ObjectId("4f7acde943f1e51fb6000003")] print list(Set(x).difference(Set(y))) I'm getting: [ObjectId('4f7abaa043f1e51544000007'), ObjectId('4f7ac02543f1e51a44000001'), ObjectId('4f7aba8a43f1e51544000006')] I need to get the first element for next operation which is important. How can I retain the list x in original format?

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• Python pattern search in a string

  - by Hulk

  In python if a string contains the following, print valid_str The output of this is Record is positive in tone: It emphasizes "what a child can do and his or her achievements, as opposed to what he or she cannot do," explains the It is useful for progress and achievements during office conferences How to search for the pattern It is useful in the above string and if not found return something. Thanks..

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• Python - Launch a Long Running Process from a Web App

  - by Greg

  I have a python web application that needs to launch a long running process. The catch is I don't want it to wait around for the process to finish. Just launch and finish. I'm running on windows XP, and the web app is running under IIS (if that matters). So far I tried popen but that didn't seem to work.

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• how to get internet explorer address bar for python

  - by john misoskian

  hi; i need grab to internet explorer address bar. how to get address bar url for python ? (i need second part other browsers grabbing address bar but internet explorer is urgently). Thanks.

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• Running a batch file with parameters in python OR F#

  - by Ramy

  I searched the site but didn't see anything quite matching what I was looking for. I created a stand alone application that uses a web service I created. To run the client I use: c:/scriptsdirecotry "run-client.bat" param1 param2 param3 param4 how would I go about coding this in python or F#. seems like it should be pretty simple but I haven't seen anything online that quite matches what i'm looking for. Thanks in advance.

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• Why does socket.inet_ntoa returns packed format in python

  - by sleepy

  Why does socket.inet_aton returns packed format in python? If I am storing the IP as integer in Database (mysql), do I have to always extract the integer value or is there any easier way out?

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• Determine precision and scale of particular number in Python

  - by jrdioko

  I have a variable in Python containing a floating point number (e.g. num = 24654.123), and I'd like to determine the number's precision and scale values (in the Oracle sense), so 123.45678 should give me (8,5), 12.76 should give me (4,2), etc. I was first thinking about using the string representation (via str or repr), but those fail for large numbers: >>> num = 1234567890.0987654321 >>> str(num) = 1234567890.1 >>> repr(num) = 1234567890.0987654

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• Problem with list slice syntax in python

  - by Dingle

  The extended indexing syntax is mentioned in python's doc. slice([start], stop[, step]) Slice objects are also generated when extended indexing syntax is used. For example: a[start:stop:step] or a[start:stop, i]. See itertools.islice() for an alternate version that returns an iterator. a[start:stop:step] works as described. But what about the second one? How is it used?

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• Proper indentation for Python multiline strings

  - by ensnare

  What is the proper indentation for Python multiline strings within a function? def method: string = """line one line two line three""" or def method: string = """line one line two line three""" or something else? It looks kind of weird to have the string hanging outside the function in the first example. Thanks.

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• Python style: multiple-line conditions in IFs

  - by Eli Bendersky

  Hello, Sometimes I break long conditions in IFs to several lines. The most obvious way to do this is: if (cond1 == 'val1' and cond2 == 'val2' and cond3 == 'val3' and cond4 == 'val4'): do_something Isn't very very appealing visually, because the action blends with the conditions. However, it is the natural way using correct Python indentation of 4 spaces. Edit: By the way, for the moment I'm using: if ( cond1 == 'val1' and cond2 == 'val2' and cond3 == 'val3' and cond4 == 'val4'): do_something Not very pretty, I know :-) Can you recommend an alternative way ?

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• Start app from within python

  - by Aaron Hoffman

  Hello, I'm trying to start an application using Python. I've seen that some people use startfile but I also read that it only works with Windows. I'm using Mac systems and hoping for it to work with them. Thanks, Aaron

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• python command line yes/no input

  - by h3

  Is there any short way to achieve what APT does in Python ? I mean, when the package manager prompts a yes/no question followed by "[Yes/no]". The scripts accepts YES/Y/yes/y or "enter" (defaults to Yes as hinted by the capital) The only thing I find in the official doc is input/raw_input.. I know it's not that hard to emulate, but it's annoying to rewrite :|

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• Python tkInter text entry validation

  - by meade

  I'm trying to validate the entry of text using Python/tkInter def validate_text(): return False text = Entry(textframe, validate="focusout", validatecommand=validate_text) where validate_text is the function - I've tried always returning False and always returning True and there's no difference in the outcome..? Is there a set of arguments in the function that I need to include? Edit - changed from NONE to focusout...still not working

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• Abstract attributes in Python

  - by deamon

  What is the shortest / most elegant way to implement the following Scala code with an abstract attribute in Python? abstract class Controller { val path: String } A subclass of Controller is enforced to define "path" by the Scala compiler. A subclass would look like this: class MyController extends Controller { override val path = "/home" }

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• Print one word from a string in python

  - by Shai

  Hi, How can i print only certain words from a string in python ? lets say i want to print only the 3rd word (which is a number) and the 10th one while the text length may be different each time mystring = "You have 15 new messages and the size is 32000" thanks.

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• symbols in command line argument.. python, bash

  - by Idlecool

  Hi, I am writing a python script on Linux for twitter post using API, Is it possible to pass symbols like "(" ")" etc in clear text without apostrophes.... % ./twitterupdate this is me #works fine % ./twitterupdate this is bad :(( #this leaves a error on bash. Is the only alternative is to enclose the text into -- "" ?? like.. % ./twitterupdate "this is bad :((" #this will reduce the ease of use for the script Is there any workaround?

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• python django automated data addition

  - by zubin71

  I have a script which reads data from a csv file. I need to store the data into a database which has already been created as $ python manage.py syncdb so, that automated data entry is possible in an easier manner, as available in the django shell.

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• Python: sort a list and change another one consequently

  - by terabytest

  I have two lists: one contains a set of x points, the other contains y points. Python somehow manages to mix the x points up, or the user could. I'd need to sort them by lowest to highest, and move the y points to follow their x correspondants. They are in two separate lists.. how do I do it?

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• in Python find number of same elements in 2 lists

  - by John

  Hi, In Python if I have 2 lists say: l1 = ['a', 'b', 'c', 'd'] l2 = ['c', 'd', 'e'] is there a way to find out how many elements they have the same. In the case about it would be 2 (c and d) I know I could just do a nested loop but is there not a built in function like in php with the array_intersect function Thanks

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