Listing 2. Option Handler, options.py
#! /usr/local/bin/python
import sys, getopt, string
def help_message():
print '''options.py -- uses getopt to recognize options
Options: -h -- displays this help message
-a -- expects an argument
--file= -- expects an argument
--view -- doesn't necessarily expect an argument
--version -- displays Python version'''
sys.exit(0)
try:
options, xarguments = getopt.getopt(sys.argv[1:],
'ha', ['file=', '--view', 'version'])
except getopt.error:
print 'Error: You tried to use an unknown option or the
argument for an option that requires it was missing. Try
`options.py -h\' for more information.'
sys.exit(0)
for a in options[:]:
if a[0] == '-h':
help_message()
for a in options[:]:
if a[0] == '-a' and a[1] != '':
print a[0]+' = '+a[1]
options.remove(a)
break
elif a[0] == '-a' and a[1] == '':
print '-a expects an argument'
sys.exit(0)
for a in options[:]:
if a[0] == '--file' and a[1] != '':
print a[0]+' = '+a[1]
options.remove(a)
break
elif a[0] == '--file' and a[1] == '':
print '--file expects an argument'
sys.exit(0)
for a in options[:]:
if a[0] == '--view' and a[1] != '':
print a[0]+' = '+a[1]
options.remove(a)
break
elif a[0] == '--view' and a[1] == '':
print '--view doesn\'t necessarily expects an argument...'
options.remove(a)
sys.exit(0)
for a in options[:]:
if a[0] == '--version':
print 'options version 0.0.001'
sys.exit(0)
for a in options[:]:
if a[0] == '--python-version':
print 'Python '+sys.version
sys.exit(0)
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