Basic file open, read, write, replace operations.

file-open-read-write-replace.py

import os, sys

os.system("find "+sys.argv[1]+" -type f > "+sys.argv[1]+"/namelist")
writeFile=open(sys.argv[1]+"/output", "w")
with open(sys.argv[1]+"/namelist") as f:
    for line in f:
        arr=line.split(".")
        newLine=arr[1][1:]
        newLine=newLine.replace("/", ".")
        if newLine == "namelist":
            continue
        if newLine == "getClassList":
            continue
        writeFile.write(newLine+"\n")
        print newLine
writeFile.close()