Computer Science Canada help assigning list to variable |
| Author: | apython1992 [ Mon Jul 26, 2010 8:12 pm ] |
| Post subject: | help assigning list to variable |
I'm trying to process a data file for sorting purposes, but I'm not that far into it yet. Where I am having trouble is storing the partially modified data into a new variable. Here is the code: # This program puts segments of satellite data in order by time and date. import string fileobject = open("c:\Users\Andrew\My Documents\space.txt", 'r') lines = fileobject.readlines() x = len(lines) - 1 y = () # Y is defined as an empty list for i in range(0, x, 2): list = string.split(lines[i], ',') y[i] = list print y #I have this line so that I can check the output and make sure it is what I'm going for...however, #when I run the program, nothing happens. No syntax error. Basically, what I'm doing in this loop is separating each line of string into a list, separated wherever a comma appears in the data file. The result is that each line that undergoes this modification becomes its own list, so that the entire file is a list, the elements of this larger list being the sublists (each line). Since I want to continue to modify the file, I need to store this entire list in a new variable, as if I just left it under "list", The output at the end of what I have so far would be simply the last line in the data file, since the list is overwritten in each turn of the loop. I have just started learning python today, so bear with me in that I do not know very much syntax at all. Any help is appreciated. |
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| Author: | Draymire [ Mon Jul 26, 2010 9:54 pm ] |
| Post subject: | Re: help assigning list to variable |
Zip up your program and the file you are using and upload it and then i will have a look, and please use code tags when you are posting code. EDIT: What version of python are you using |
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| Author: | Nick [ Tue Jul 27, 2010 9:11 am ] |
| Post subject: | RE:help assigning list to variable |
look into the differences between lists and tuples, also look into the list.append method |
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| Author: | CeciDai [ Thu Dec 16, 2010 11:30 am ] |
| Post subject: | RE:help assigning list to variable |
You assigned y as a tuple, dumb, dumb Go use a list Like this y=[] to add stuff, use y.append(item) BWHAHAHAHA |
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