Python option parser

Python option parser

  an optionparser can contain several option groups, each of which can contain several options. An option group is obtained using the class optiongroup class optparse. Parser is the optionparser instance the group will be inserted in to.

Py -h sample argument parser optional arguments -h, --help show this help message and exit the second command line usage gives help option which produces a help message as shown.

!usrbinenv python import os, sys from optparse import optionparser parser optionparser () usage usage prog options arg1 arg2 parser. Addoption (-d, --dir, typestring, helplist of directory, destindir, default.).

You give a description of the options that the program can receive, and optparse will do reasonable stuff for you.

  the argparse module makes it easy to write user-friendly command-line interfaces. The program defines what arguments it requires, and argparse will figure out how to parse those out of sys. The argparse module also automatically generates help and usage messages and issues errors when users give the program invalid arguments.

Py -h echo positional arguments echo echo the string you use here optional arguments-h, --help show this help message and exit. Now, how about doing something even more useful import argparse parser argparse. Addargument (square, help display a square of a given number) args parser.

Def parseargs() parse the command line for options parser optparse. Addoption( --user, destuserinstall, actionstoretrue, defaultfalse, helpinstall in user site package (requires python 2. Addoption( --download-base, destdownloadbase, metavarurl, defaultdefaulturl, helpalternative url from where to download the setuptools package) parser.

Version 1 add a method to optionparser which applications must call after parsing arguments import optparse class optionparser (optparse. Optionparser) def checkrequired (self, opt) option self. Getoption(opt) assumes the options default is set to none! If getattr(self. Error(s option not supplied option) parser optionparser() parser.

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Python option parser

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Python option parser
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