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Size: 1017
Comment: found it
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Size: 1130
Comment: +usage string, argument counting to example
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| Line 12: | Line 12: |
| parser = optparse.OptionParser() | parser = optparse.OptionParser("usage: %prog [options] arg1 arg2") |
| Line 19: | Line 19: |
| if len(args) != 2: parser.error("incorrect number of arguments") |
OptParse is a module introduced in Python2.3 that makes it easy to write command line tools.
You give a description of the options that the program can receive, and OptParse will do reasonable stuff for you.
For example:
1 import optparse
2
3 if __name__=="__main__":
4 parser = optparse.OptionParser("usage: %prog [options] arg1 arg2")
5 parser.add_option( "-H", "--host", dest="hostname", default="127.0.0.1",
6 type="string", help = "specify hostname to run on" )
7 parser.add_option( "-p", "--port", dest="portnum", default=80,
8 type="int", help = "port number to run on" )
9
10 (options, args) = parser.parse_args()
11 if len(args) != 2:
12 parser.error("incorrect number of arguments")
13 hostname = options.hostname
14 portnum = options.portnum
args contains your fixed arguments, options contains your values.
For example, options.portnum would contain the integer 80, in the example above.
[http://www.python.org/doc/current/lib/module-optparse.html Official Python 2.3 OptParse Documentation]