Simple script to help appending the "www." prefix to entries in your hosts file

wwwappender.py

from shutil import copyfile

copyfile("in.txt", "out.txt")

inputFile = open("in.txt", "r")
outputFile = open("out.txt", "a")

outputFile.write("\n\n")

for line in inputFile.readlines():
    if line.startswith("0.0.0.0"):
        # makes a clean line removing the "0.0.0.0", spaces and tabs
        cleanLine = line.lstrip("0. 	")

        # finds the index where the website address starts
        index = len(line) - len(cleanLine)

        newLine = ""

        if (cleanLine[0:4]) != "www.":
            # makes a list of characters out of the line
            # so we can add the "www". to the address
            charList = list(line)
            charList[index] = "www." + charList[index]
            newLine = "".join(charList)

        outputFile.write(newLine)