open and read file

openfile.py

import sys
from optparse import OptionParser

try:    
  	# assumes file was specified as argument in the command line using optparse with --file option
    file=open(options.file, 'r')     
except FileNotFoundError: # works for python3
    print("Could not find file")
    sys.exit()

except IOError:
    print("Could not open file")
    sys.exit()

# iterate over the file
for line in file:
    print(line.rstrip())