file I/O and arithmetic calculation

[Carlos Nepomuceno]

Funny! I made a lot of assumptions regarding your requirements specification. Let me know if it isn't what you need:

### 1strow_average.py ###
#Assuming you have CSV (comma separated values) files such as:
#1.txt = '0,1,2,3,4,5,6,7,8,9\n' \
#        '10,11,12,13,14,15,16,17,18,19\n' \
#        '20,21,22,23,24,25,26,27,28,29\n' ...
#
# Usage: contents[file][row][column]
# contents[0]       : file '1.txt'
# contents[1][2]    : 3rd row of file '2.txt'
# contents[3][4][5] : 6th column of 5th row of file '4.txt'
# len(contents)     : quantity of files
# len(contents[4])  : quantity of lines in file '5.txt'
# len(contents[4][0]: quantity of values in the 1st line of file '5.txt'

filenames = ['1.txt', '2.txt', '3.txt', '4.txt', '5.txt']
contents  = [[[int(z) for z in y.split(',')] for y in open(x).read().split()] for x in filenames]
s1c  = [sum([r[0] for r in f]) for f in contents]
a1r  = [sum(f[0])/float(len(f[0])) for f in contents]
print '\n'.join([x for x in ['File "{}" has 1st row average = {:.2f}'.format(n,a1r[i]) if s1c[i]==50 else '' for i,n in enumerate(filenames)] if x])


________________________________
> From: wilkeira at gmail.com 
> Date: Thu, 23 May 2013 01:13:19 +0900 
> Subject: file I/O and arithmetic calculation 
> To: python-list at python.org 
>  
>  
> Dear all, 
>  
> I would appreciate if someone could write a simple python code for the  
> purpose below: 
>  
> I have five text files each of 10 columns by 10 rows as follows: 
>  
>  
>  
> file_one = 'C:/test/1.txt' 
> file_two = 'C:/test/2.txt' 
> . . . 
> file_five = 'C:/test/5.txt' 
>  
> I want to calculate the mean of first row (10 elements) for each file  
> (5 files), if mean of first column (10 elements) of each file (5  
> files) is 50. 
>  
> Thank you in advance. 
>  
> Keira 
>  
>  
> -- http://mail.python.org/mailman/listinfo/python-list