python-tutorials/programs/exceptions_finally.py

import sys
import time

f = None
try:
    f = open("poem.txt")
    # Our usual file-reading idiom
    while True:
        line = f.readline()
        if len(line) == 0:
            break
        print line,
        sys.stdout.flush()
        print "Press ctrl+c now"
        # To make sure it runs for a while
        time.sleep(2)
except IOError:
    print "Could not find file poem.txt"
except KeyboardInterrupt:
    print "!! You cancelled the reading from the file."
finally:
    if f:
        f.close()
    print "(Cleaning up: Closed the file)"