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• Sanitising user input using Python

  - by Steve

  What's the best way to sanitise user input for a Python-based web application? Is there a single function to remove HTML characters and any other necessary characters combinations to ensure that an XSS or SQL injection attack isn't possible?

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• Cross-platform space remaining on volume using python

  - by Justin Waddell

  I need a way to determine the space remaining on a disk volume using python on linux, Windows and OS X. I'm currently parsing the output of the various system calls (df, dir) to accomplish this - is there a better way?

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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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• how to delete lowercase words from a string in python

  - by gaggina

  I'm new in python and I'm having some issues doing a simple thing. I've an array (or list as it's said in pyton) like this: list = [ 'NICE dog' , 'blue FLOWER' , 'GOOD cat' , 'YELLOW caw'] As you see each element of this array contains some words. These words is both lowercase and uppercase. How I can delete from this array each lowercase words? For example I'd like to have as result this list: list = [ 'NICE' , 'FLOWER' , 'GOOD' , 'YELLOW']

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• Python unhash value

  - by blah01

  Hi all I am a newbie to the python. Can I unhash, or rather how can I unhash a value. I am using std hash() function. What I would like to do is to first hash a value send it somewhere and then unhash it as such: #process X hashedVal = hash(someVal) #send n receive in process Y someVal = unhash(hashedVal) #for example print it print someVal Thx in advance

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• Regular expression that finds and replaces non-ascii characters with Python

  - by prosseek

  I need to change some characters that are not ASCII to '_'. For example, Tannh‰user - Tann_huser If I use regular expression with Python, how can I do this? Is there better way to do this not using RE?

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• Python: inserting double or single quotes around a string

  - by Jessy

  Im using python to access a MySQL database and im getting a unknown column in field due to quotes not being around the variable. code below: cur = x.cnx.cursor() cur.execute('insert into tempPDBcode (PDBcode) values (%s);' % (s)) rows = cur.fetchall() How do i manually insert double or single quotes around the value of s? I've trying using str() and manually concatenating quotes around s but it still doesn't work. The sql statement works fine iv double and triple check my sql query.

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• writing python to extract data from a file

  - by user297003

  Hi i am new to python i am trying to extract the text between that has specific text file ---- data1 data1 data1 extractme ---- data2 data2 data2 ---- data3 data3 extractme ---- and then dump it to text file so that ---- data1 data1 data1 extractme --- data3 data3 extractme --- thanks for the help data1 data1

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• How to implement a Mutex in Python when using Gtk with PyGTK

  - by Julian

  Hi, I have an application that starts several threads using gobject.timeout_add(delay, function) Now in my function I want to test and set on some variable, e.g. def function(self): if flag == True: flag = False doSomething() Now to make this threadsafe, I would have to lock the function using some mutex lock. Is this possible with Gtk? Or can I use the Python Lock objects from threading?

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• How to split line at non-printing ascii character in Python

  - by Donnied

  How can I split a line in Python at a non-printing ascii character (such as the long minus sign hex 0x97 , Octal 227)? I won't need the character itself. The information after it will be saved as a variable.

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• Splitting a list in python

  - by blob8108

  Hi, I'm writing a parser in Python. I've converted an input string into a list of tokens, such as: ['(', '2', '.', 'x', '.', '(', '3', '-', '1', ')', '+', '4', ')', '/', '3', '.', 'x', '^', '2'] I want to be able to split the list into multiple lists, like the str.split('+') function. But there doesn't seem to be a way to do my_list.split('+'). Any ideas? Thanks!

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• Are C style macros available in Python?

  - by Dragos Toader

  In C there's a way to #define macros: #define OBJWITHSIZE(_x) (sizeof _x)/(sizeof _x[0]) Is there a way to do this in Python?

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• How do I unload (reload) a Python module?

  - by Mark Harrison

  I have a long-running python server and would like to be able to upgrade a service without restarting the server. What's the best way do do this? if foo.py has changed: unimport foo <-- how do I do this? import foo myfoo=foo.Foo()

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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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• Making Noise with Python

  - by Elliot

  I am trying to get python to make noise when certain things happen. Preferably, i would like to play music of some kind, however some kind of distinctive beeping would be sufficient, like an electronic timer going off. I have thus far only been able to make the system speaker chime using pywin32's Beep, however this simply does not have the volume for my application. Any ideas on how I can do this?

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• Decompose a Python string into its characters

  - by PoorLuzer

  I want to break a Python string into its characters. sequenceOfAlphabets = list( string.uppercase ) works. However, why does not sequenceOfAlphabets = re.split( '.', string.uppercase ) work? All I get are empty, albeit expected count of elements

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• Python, concise way to test membership in collection using partial match

  - by aaa

  hello. What is the pythonic way to test if there is a tuple starting with another tuple in collection? actually, I am really after the index of match, but I can probably figure out from test example for example: c = ((0,1),(2,3)) # (0,) should match first element, (3,)should match no element I should add my python is 2.4 and/or 2.5 thanks

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• Inverting image using the Python Image Library module

  - by Gresham

  Good day chaps. I'm interested in learning how to invert (make a negative of) an image using the python image libary module. I cannot however, use the ImageOps function 'invert.' I need another solution, using the RGB values. I've searched and tried to no avail. Thanks for any help :)

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• Good practice of using list of function in Python

  - by riskio

  I am pretty new to python and I discovered by myself that I can create a list of function and call with a for loop. example: def a(args): print "A" def b(args): print "B" def c(args): print "C " + str(args) functions = [a,b,c] for i in functions: i(1) So, my question is: is there any good practice or elegant way to use list of functions and what is a good use of all this? (do have a particular name the "list of functions"?) thank you

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• Backup of folder + database - Python

  - by RadiantHex

  Hi there, I feel like this is quite delicate, I have various folders whith projects I would like to backup into a zip/tar file, but would like to avoid backing up files such as pyc files and temporary files. I also have a Postgres db I need to backup. Any tips for running this operation as a python script? Also, would there be anyway to stop the process from hogging resources in the process? Help would be very much appreciated.

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• Setting up a python screen scraper that could work on Google App engine

  - by cozza

  I am looking to setup a automated screen scraper that will run on Google app engine using python. I want it to scrape the site and put the specified results into a Entity in app engine. I am looking for some directions on what to use. I have seen beautifulsoup but wonder if people could recommend anything else that could run on Google App engine.

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• Python, invoke super constructor

  - by Mike

  class A: def __init__(self): print "world" class B(A): def __init__(self): print "hello" B() hello In all other languages I've worked with the super constructor is invoked implicitly. How does one invoke it in Python? I would expect super(self) but this doesn't work

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• Newbie : installing and upgrading python module.

  - by iamgopal

  I have downloaded and install a python library, via setup.py , python2.5 setup.py install ... now the version is changed at the source . a newer library is available. originally , i have clone it via mercurial, and install it. right now , i have updated repository. how do i use the newer version ? overwrite the installation ? by simply doing setup.py install again ?

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• Python shortcuts

  - by lyrae

  Python is filled with little neat shortcuts. For example: self.data = map(lambda x: list(x), data) and (although not so pretty) tuple(t[0] for t in self.result if t[0] != 'mysql' and t[0] != 'information_schema') among countless others. In the irc channel, they said "too many to know them all". I think we should list some here, as i love using these shortcuts to shorten & refctor my code. I'm sure this would benefit many.

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• Python 2.5 module allowing implementation of javascript under windows

  - by nabizan

  hi im looking for some modules for python 2.5 whitch allows to run and executes javascript ... any ideas?

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