Just a quick command line number/string sorter

sort.py

#!/usr/bin/python
from sys import argv
from sys import exit

help = '''Usage: sort [OPTION]... [ARGS]\n
[OPTIONS]
\'-a\' - Sort ARGS alphabetically.
\'-i\' - Sort ARGS numerically.
\'-b\' - Sort ARGS alphabetically
\'--help\' - Display this dialog.'''

error = '''Usage: sort [OPTION]... [ARGS]
Try 'sort --help' for more information.'''

error_modeint = 'ERROR: With option \'-i\' all arguments following must be ints.\n'

error_modestr = 'ERROR: With option \'-a\' all arguments following must be strs or chars.\n'

error_modeboth = 'ERROR: With option \'-b\' all arguments following must be ints, strs or chars.\n'

error_args = 'ERROR: %s is not a valid option.\n'


if len(argv) == 1: 
    print error
    exit(1)

arglist = []

args = argv[1].split('-')
if len(args) < 2:
    args.insert(0, '')
elif len(args) > 2:
    args.remove('')

mode = 'both'
if args[1] == 'a':
    mode = 'str'
    if len(argv) < 3:
        print error_modestr
        print error
        exit(1)
elif args[1] == 'i':
    mode = 'int'
    if len(argv) < 3:
        print error_modeint
        print error
        exit(1)
elif args[1] == 'help':
    mode = 'help'
elif args[1] == 'b':
    mode = 'both'
    if len(argv) < 3:
        print error_modeboth
        print error
        exit(1)
else:
    print error_args % str(argv[1])
    print error
    exit(1)

if mode == 'int':
    for i in range(2, len(argv)):
        try:
            arglist.append(int(argv[i]))
        except:
            print error_modeint
            print error
            exit(1)
    arglist.sort(key=int)

elif mode == 'str':
    for i in range(2, len(argv)):
        try:
            arglist.append(str(argv[i]))
        except:
            print error_modestr
            print error
            exit(1)
    arglist.sort()

elif mode == 'both':
    for i in range(1, len(argv)):
        try:
            arglist.append(str(argv[i]))
        except:
            print error_modeboth
            print error
            exit(1)
    arglist.sort()

if mode == 'help':
    print help
else:
    for i in arglist:
        print i