Need explanation some terms in python code

Question

this is my code

'''Nimal,30,60
   Saman,80,45
   Upali,100,80
   above text is in input.txt
   '''
f1 = open('input.txt','r')
f2 = open('output.txt','w')
line = f1.readline()
while(line):
    data = (line.strip()).split(',')
    total = float(data[1])+float(data[2])
    f2.write('{},{},{},{}\n'.format(data[0],data[1],data[2],total))
    line=f1.readline()
f1.close()
f2.close()

I need to know while(line) how become true and what happen in below line

   f2.write('{},{},{},{}\n'.format(data[0],data[1],data[2],total))

Are you facing any errors? Don't really understand what you are asking here. — Burhan Khalid
– Burhan Khalid, Commented Jul 12, 2016 at 1:44
So what is the question? I mean, are you asking what that line of code is doing? Its just writing data to the output file. — Burhan Khalid
– Burhan Khalid, Commented Jul 12, 2016 at 1:47

Chong Tang · Accepted Answer · 2016-07-12 01:48:16Z

1

In your example, line is a string. In python, a string will be evaluated as False if it's an empty string, say ''. Otherwise, it will be evaluated as True.

What f2.write('{},{},{},{}\n'.format(data[0],data[1],data[2],total)) does is to fill the four {} with the corresponding values given in the format function, and then write out to f2. For example, f2.write('{},{},{},{}\n'.format('Nimal', 1, 2, 3)) will be formalized as a string 'Nimal,1,2,3\n' without quotes, and then write this string into file f2.

answered Jul 12, 2016 at 1:48

Chong Tang

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1 Comment

gihansalith Over a year ago

Thnx I got it buddy

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