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stryker213

04-25-2010 02:15 PM

Calculating average from Python Script

Hello, I'm trying to write a python script that will calculate my test scores from a text file named "exams."

Sample input would be:
Calculus 85 90
Physics 90 85 93

Output will look like:
Calculus 87.5
Physics 89.3

I have the following code:

Code:

#!/usr/bin/python

import math

import sys



f = open('exams',"r")

l = f.readline()

while l :

 l = l.split(None,10)

 L = l[1:]

 print sum

 print l[:1]

 print 'Scores ', L

 print 'Number of Values ', len(L)

 l = f.readline()

My intent is to sum the values found in L and divide by len(L).

I think my issue is that when I split the values, I get a string array (ex. ['85', '90'] ), which makes it hard to do calculations.

indienick

04-25-2010 02:29 PM

You can convert strings to integers in Python by passing the value to the int() function, like so:

Code:

>>> int('230498')

230498

>>>

Mara	04-25-2010 02:33 PM

print int(L[0])

The int operator gives you the conversion you need.

stryker213

04-25-2010 02:35 PM

Quote:

Originally Posted by indienick (Post 3947325)

You can convert strings to integers in Python by passing the value to the int() function, like so:

Code:

>>> int('230498')

230498

>>>

Thanks for the advice indienick. However, it's still not working. My code takes each line of text and parses it into a array so that it looks like this: ['Calculus', '85', '90']. Using L = l[1:], gives me ['85', '90'], which is close. If I used your method (L = int(l[1:])), I get an error.

stryker213

04-25-2010 02:38 PM

Quote:

Originally Posted by Mara (Post 3947327)

print int(L[0])

The int operator gives you the conversion you need.

Mara, thank you very much for your help. Your method does work for individual iterations, but how can I make it so that it goes through my entire exam list? For example, I may have two test scores for one subject and four in another.

Thanks again!

indienick

04-25-2010 04:58 PM

Maybe try something like this:

Code:

average = 0



for x in range(1, len(l)):

  score = int(l[x])

  average += score



average = float(average / (len(l) - 1))

print average

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