# Demonstrate use of command-line arguments # by Sara Sprenkle # Usage: python command_line_args.py filename import sys PROG_ARG_LOC=0 FILENAME_ARG_LOC=1 # Make sure there are sufficient arguments. if len(sys.argv) < 2: print "Error: invalid number of command-line arguments" print "Usage: python", sys.argv[PROG_ARG_LOC],"<filename>" sys.exit(1) filename = sys.argv[FILENAME_ARG_LOC] print "We will use file", filename, "as input"