Hi Edwards8,

It turns out that PIL will let you read pieces of an image file in sequence without loading the entire thing into memory. Fred Lundh has a post about it on a python mailing list here...

Hi zachabesh,

Can't you just use os.path.getsize()? You call it with the name of the file as an argument.

Hi count_chockula,

You can indeed edit a dictionary. You would load the dictionary with pickle.load(), then add a new key-value pair, then dump it again, like so:f = open("filename.txt", "r")
d =...

Hi count_chockula,

The file is being overwritten because your file handles are created with an option of "w" which is short for "write." To add extra data to a file without overwriting, you need...

Hi count_chockula,

First of all, class definitions do not have parentheses after them. So:class pettyAccount():should be:class pettyAccount:

Second of all, why are you asking the user for the...

Hi linux,

Yes, that is definitely possible. I've done something similar from within both pygame and Tkinter (I used Tkinter to design a GUI program for map editing). You would want to begin by...

Hi jmroach,

You're going to want to use an sqlite pragma statement (http://www.sqlite.org/pragma.html). A pragma statement lets you query database meta-data or in some cases alter the behavior of...

Hi nish88,

Are you running the program from the command line? It needs to be given two command-line parameters (width and height) or it will shut down immediately.

Hi nish88,

Search in this forum for "game of life."

Hi all,

Are there any python modules which contain functions for getting the roots of a quartic (degree 4) polynomial? I don't think NumPy has anything like it, and I really don't want to enter...

Hi RMartins,

This has less to do with Python and more to do with mathematics, but I'll say it anyway.

As jrcagle said, 10**20 is a huge number of iterations to perform. Lucky for you, you won't...

Hi StepIre,

You could use the pickle module, which serializes and saves data structures, effectively allowing you to skip the whole messy business of file parsing. Example:import pickle

# If...

Hi Carlo Gambino,

The straightforward way of doing this is:g = [ 1, 2, 3, 4 ]
h = []
for i in range(len(g)+1)[1:]:
h.append(g[i-1]+i)
print hAlternatively, you could just use a list...

Hi trihaitran,

Use the "template method" software design pattern!

Here's how it works: we're going to split that function of yours across two different functions in two different classes: a...

Hi all,

I added a new script to the code snippets page. This time, it's a logic puzzle called "Petals Around the Rose." The goal is for you to infer what algorithm is being used to "score" rolls...

Hi all,

Have you ever heard of "Petals Around the Rose?" It's a logic puzzle. The way it works is, I roll five dice, then tell you what the "score" is for this round. I can repeat this for you as...

Hi nirmalarasu,

I have to say, doing things this way runs counter to the Linux philosophy. You shouldn't be trying to smuggle a mutilated Python interpreter (plus whatever modules you need) onto...

Hi nirmalarasu,

I think freeze (http://wiki.python.org/moin/Freeze) is what you're looking for.

I have an idea, and that idea is "please wrap your program in code tags."

Hi gawain_,

Unfortunately I can't tell you how to do what you're asking without seeing the files you're working on. Python isn't magic - it can't figure out where page breaks are supposed to go...

Hi gawain_,

To answer your first question, you have it backwards. The conditional expression which controls the while loop is (inp.strip() != "") - a boolean expression, one which resolves to...

Hi gawain_,

Why are you reading input using stdin? Why not use one of python's input commands? If you're set on using stdin, you could try this:import sys
inp = sys.stdin.readline()
while...

Hi msaenz,

Lardmeister is correct in that your check for the symbol token "UPS" is flubbed. His approach works fine if you want to treat the whole XML file as a string. However, if you want to do...

Hi nish88,

The string "<Button-1>" is a Tkinter shorthand for "the left mouse button." Incorporate the code I supplied into your Tkinter application and run it, and you will see.

Well, firstly... (http://www.answers.com/firstly&r=67)

(ducks)

Hi rysin,

Maybe try importing os and run os.listdir() on the given directory. Do the following and please tell me what you get:import os
os.listdir("C:\\orb")Or maybe it could be some kind of...

Hi rysin,

Can you open the file at all from within python? If you sayf = open("C:\\orb\\backroundorb.jpeg", "r")does that work?

Hi all,

I add a pygame implementation of the Game of Life to the Code Snippets section. I was actually kind of surprised that we didn't already have one in there! The program only has about 60...

Life (http://www.bitstorm.org/gameoflife/) is a "game" or cellular automaton - an evolving computational state system - developed by a Cambridge mathematician named John Conway.

The idea is...

Hi nish88,

I'm not sure I understand what you mean. Do you want to click on the canvas, then have an oval pop up where you clicked? It sounds like you need to bind mouseclicks on the canvas to a...

Hi Ilya,

If you want to do interactive simulations, I think you might be better off checking out pygame (http://www.pygame.org), which is designed for games but can easily be adapted for this kind...

Hi John,

If I understand things correctly, then first off, line 10 is wrong. Instead of sayingprint "After year", nyou ought to sayprint "After year", ibecause the variable that represents the...

Hi rysin,

Unless there's a high-level python module that takes care of chat-type stuff for you (and if there is, I don't know about it), you're going to have to learn how to use client and server...

Hi gusbear,

Are you using the Zelle graphics module? If you are, I think you should try the following strategy. Create a GraphWin, then in one of the corners make a button by drawing a rectangle,...

Hi gtselvam,

I hate to say this, but I think what you want to do is impossible due to operating system limitations. If memory serves, the os.system() function call creates a forked environment...

Hi seamus.boyle,

The problem is in line 5:im3 = Image.composite('im1','im2',"L")See, what you're doing is sending the string literals "im1" and "im2" as arguments to the function...

Hi balance,

You should open a command prompt, navigate to the directory where the script is, and invoke it by saying:python UbuntuPackageGrabber.py URL_GOES_HERESubstitute the package URL you have...

Hi balance,

How are you running it?

The error occurs because the "downloader" module, urllib, has a urlopen() function which doesn't recognize the URL being passed in. If you step backwards,...

Hi eleonora,

It's also easy to use the pickle module. Pickle dumps objects into a data file and reloads them without you having to worry about parsing text. So, if you have a variable named...

Hi eleonora,

Really? I just ran it and it stops correctly. The print_board() function did need some tweaking to make the board come out okay, and the x index was off by one (meaning, the first...