EditFile.py

#!/usr/bin/python
#EditFile.py
#Python 2.7
#Edit contents of text file
#Chris Clarke
#21.08.2014

import os
import sys

def getPath():
   path = raw_input("Enter name of directory your file is in: ")
   print os.listdir(path)
   os.chdir(path)

getPath()
filename = raw_input("Enter name of text file to open: ")
lines = []
try:
   with open(filename) as f:
      for line in f:
         print '\n', line
         print "For current line, please choose:"
         choice = raw_input("edit, insert, append, delete? <return> = nextline: ")
         choice = choice.lower() # convert to lower case
         if choice in {'edit', 'ed', 'e'}:
            newline = raw_input("Edit: type new line> ")
            lines += newline+"\n"
         elif choice in {'insert','ins', 'in', 'i'}:
            newline = raw_input("Insert (add before): type new line> ")
            lines += newline+"\n"
            lines += line
         elif choice in {'append', 'app', 'ap', 'a'}:
            lines += line
            newline = raw_input("Append (add after): type new line> ")
            lines += newline+"\n"
         elif choice in {'delete', 'del', 'd'}:
            print "Line deleted."
         else:
            lines += line
except IOError:
   print "Unable to open file."
   sys.exit(1)
else:
   f.close()

try:
   with open(filename, 'w') as f:
      for line in lines:
         f.write(line),
except IOError:
   print "Couldn't write to file!"
else:
   print "File {0} saved.".format(filename)
   f.close()