A simple python script to add text to a line in a text file.

AppendTextToLine.py

readfile = raw_input("Please Enter The File You Wish To Read: ")
savefile = raw_input("Please Enter The File You Wish To Save: ")

read = open(readfile, "r")
save = open(savefile, "w+")

for line in read:
    text = " " # Enter what you would like to append here
    text2 = line
    newline = text+text2 # You can swap the variables here if you want to add something to the beginning or end of the line.

    if newline not in save:
    	save.write(newline)
    	print line," ==> ",newline

print "\nComplete"