#!/usr/bin/env python

import sys

try:
    f = open(sys.argv[1])
    print("... hello world ...")
    s = f.readline()
    print("... readline ...")
    i = int(s.strip())
    print("... integer conversion ...")

except IOError as e:
    print("I/O error({0}): {1}".format(e.errno, e.strerror))
except ValueError:
    print("Could not convert data to an integer.")
except:
    print("Unexpected error:", sys.exc_info()[0])
    raise

print("... end of program ...")