add symbol "*" to full file program

comments.py

#!/usr/bin/python3

import os

if name == 'main':
    print('Start append')
    currentDir = os.getcwd()
    addSymbol = '*'
    fileNames = os.listdir(currentDir)
    docs = list(filter(lambda x: not x.endswith('.py'), fileNames))
    for fileName in docs:
        file = open(fileName, 'r')
        newName = 'new_' + fileName
        newFile = open(newName, 'w')
        print('new file - {0}'.format(newName))
        for line in file.readlines(): 
            newLine = addSymbol + '\t' + line
            newFile.write(newLine)
        newFile.close()
        file.close()
    print('End append')