SequentialNumGen.py accepts exactly two integers as arguments, and prints the range between them to terminal

SequentialNumGen.py

#!/usr/bin/env python
#
# SequentialNumGen.py
#
# accepts exactly two integers as arguments,
# and prints the range between them to terminal

from sys import exit
import optparse

def usage():
    print "usage: SequentialNumGen.py num1 num2 (num1 must be less than num2)"

def getArgs():
    parser = optparse.OptionParser()
    opts, args = parser.parse_args()
    if not args:
        parser.print_help()
        sys.exit(1)
    return opts, args

def main():
    opts, args = getArgs()
    try:
        int(args[0])
        int(args[1])
    except ValueError:
        exit(usage())
    START  = int(args[0])
    END    = int(args[1]) + 1
    if ( START > END ):
        exit(usage())
    print ("\n".join(map(str, range(START,END))))

if __name__ == '__main__':
    main()

# SAMPLE OUTPUT:
#
# $ SequentialNumGen.py 1 10
# 1
# 2
# 3
# 4
# 5
# 6
# 7
# 8
# 9
# 10