Own help message using optparse

is possible to make own help messag开发者_如何转开发e or attach own event on help option using optparse module in Python?

Sure - just use the params to the OptionParser constructor:

import optparse

help_text = """
Hi, this is a really long help message for %prog. 

It's a pretty ace thing. (C)2010 Stuff etc.
"""
parser = optparse.OptionParser(usage=help_text, version="%prog 1.0 beta")
(options, args) = parser.parse_args()

For custom help messages I ignore optparse altogether:

import os
import sys
from optparse import OptionParser

__version__ = '1.0'    

progname = os.path.basename(sys.argv[0])
usage = """\
usage: %s [options] URL

options:
  --pprint     (default)
  -h --help
  --version
""" % progname

if __name__ == "__main__":
    if len(sys.argv) < 2 or "-h" in sys.argv or "--help" in sys.argv:
        sys.exit(usage)
    if "--version" in sys.argv:
        sys.exit(progname + " " + __version__)

    parser = OptionParser()
    parser.add_option("--pprint", action='store_true', default=True)
    (options, args) = parser.parse_args()
    print(options, args)

You should be able to replace the default help mechanism with your own merely by subclassing OptionParser and overriding the print_help() method.