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"""This module contains code from

Think Python by Allen B. Downey

http://thinkpython.com

Copyright 2012 Allen B. Downey

License: GNU GPLv3 http://www.gnu.org/licenses/gpl.html

"""

import sys

def sed(pattern, replace, source, dest):

"""Reads a source file and writes the destination file.

In each line, replaces pattern with replace.

pattern: string

replace: string

source: string filename

dest: string filename

"""

try:

fin = open(source, 'r')

fout = open(dest, 'w')

for line in fin:

line = line.replace(pattern, replace)

fout.write(line)

fin.close()

fout.close()

except:

print 'Something went wrong.'

def main(name):

pattern = 'pattern'

replace = 'replacendum'

source = name

dest = name + '.replaced'

sed(pattern, replace, source, dest)

if __name__ == '__main__':

main(*sys.argv)