Modifying file content using python

Question

I have a file that consists of a single line:

a,x,b,c,d,e

I want to convert this into

a,x,b,x,c,x,d,x,e,x

Is there any easy way to achieve this with python?

What is the pattern? an x after any letter that is not x or followed by x? — M4rtini
– M4rtini, Commented Feb 26, 2014 at 11:49
By that definition your original example is wrong. Unless you meant: x after any letter that's not x, unless already followed by x. What should a,x,x,b,x,c,d,e give? — M4rtini
– M4rtini, Commented Feb 26, 2014 at 12:01
That pattern wont occur..The input is specific which i am parsing from an html table ..lets say a is the name of class I am taking and x is grade — Stormvirux
– Stormvirux, Commented Feb 26, 2014 at 12:05

MONTYHS · Accepted Answer · 2014-02-26 11:49:24Z

1

 my_file = open(filename)
 data = my_file.read()
 data = data.split(',')
 str = ''
 for each in data:
     if each != 'x':
         str += each + ',' + 'x' + ','
 str= str.strip(',')
 print str

edited Feb 26, 2014 at 11:49

answered Feb 26, 2014 at 11:42

MONTYHS

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7 Comments

M4rtini Over a year ago

gives: a,x,x,x,b,x,c,x,d,x,e,x

Stormvirux Over a year ago

Is there any easier way if we suppose that the file is a csv file using csv module or pandas?

MONTYHS Over a year ago

if its csv file better to use csv.DictReader

MONTYHS Over a year ago

Sorry i didn't check the x

MONTYHS Over a year ago

@M4rtini please check now

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U2EF1 · Accepted Answer · 2014-02-26 11:54:08Z

1

import re
s = open(filename).read()
open(filename, 'w').write(',x,'.join(re.findall(r'[a-wyz]', s)) + ',x\n')

answered Feb 26, 2014 at 11:54

U2EF1

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