把开发过程中经常用到的一些内容段做个记录，下面内容是关于python 带可选参数的命令行的内容，希望能对各朋友也有用途。

#!/usr/bin/env python

[SNIPPET_NAME: Show optparse]

[SNIPPET_CATEGORIES: Python Core]

[SNIPPET_DESCRIPTION: GNU style arguments via optparse]

[SNIPPET_AUTHOR: Jurjen Stellingwerff jurjen@stwerff.xs4all.nl]

[SNIPPET_LICENSE: GPL]

example show_optparse.py

import optparse, sys

program = “show_optparse.py”

usefull when the program alters from the normal python file

version = “”"%prog 0.1
Copyright © 2010 Jurjen Stellingwerff
This is free software: you are free to change and redistribute it.
There is NO WARRENTY, to the extent permittable by law.

Written by Jurjen Stellingwerff.
“”"

usage = “Usage: %prog [OPTION]… [REST]”
description = “Demonstrates python code for GNU style arguments.”

def do_single(option, opt, value, parser):
print value

parser = optparse.OptionParser(usage=usage, version=version, description=description, prog=program)
parser.add_option("-?", action=“help”, help=optparse.SUPPRESS_HELP)
parser.add_option("-f", “–file”, dest=“filename”, action=“append”,
help=“display this file”, metavar=“FILE”)
parser.add_option("-q", “–quiet”,
action=“store_false”, dest=“verbose”, default=True,
help=“don’t print status messages to stdout”)
parser.add_option("–this-is-a-bit-too-long-argument", metavar=“SOMETHING”,
help=“when arguments get too long the line splits, this also works for the longer help strings”)
parser.add_option("-s", metavar=“SOMETHING”, action=“callback”, callback=do_single, type=“string”,
help=“single token argument with a parameter”)
parser.add_option_group(group)

(options, args) = parser.parse_args()

if options.this_is_a_bit_too_long_argument:
print options.this_is_a_bit_too_long_argument

if options.filename:
for filename in options.filename:
if options.verbose:
print “Printing file”,filename
try:
f = open(filename)
for line in f.readlines():
print line.rstrip()
except IOError:
print "No such file: "+options.filename

for rest in args:
print “Rest:”,rest

demonstrate the help page when there are no parameters given

not very useful in an actual program

if len(sys.argv)==1:
parser.print_help()