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Optional positional arguments supplied to a callback function specified with the callback argument Optional keyword arguments supplied to a callback function specified with the callback argument A list of strings that specifies all possible option values Used when an option only has a limited set of values (for example, ['small , 'medium', 'large']) The constant value that s stored with the 'store_const' action Sets the default value of the option if not supplied By default, the default value is None Sets the name of the attribute used to store option values during parsing Normally the name is derived from the option name itself Help text for this particular option If this is not supplied, the option will be listed in help without a description The value optparseSUPPRESS_HELP can be used to hide an option The special keyword '%default is replaced by the option default value in the help string Specifies the name of an option argument that s used when printing help text Specifies the number of option arguments for actions that expect arguments The default value is 1 If a number greater than 1 is used, option arguments will be collected into a tuple that is then used whenever arguments are handled Specifies the type of an option Valid types are 'string' (the default), 'int', 'long , 'choice , 'float , and 'complex
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Disallows the mixing of simple options with positional arguments For example, if '-x and '-y' are options that take no parameters, the options must appear before any arguments (for example, 'prog -x -y arg1 arg2 arg3')
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Allows the mixing of options with positional arguments For example, if '-x and '-y' are simple options that take no parameters, they may be mixed with the arguments, such as in 'prog -x arg1 arg2 -y arg3'This is the default behavior
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Parses command-line options and returns a tuple (options, args) where options is an object containing the values of all the options and args is a list of all the remaining positional arguments left overThe options object stores all the option data in attributes with names that match the option name For example, the option '--output' would have its value stored in optionsoutput If the option does not appear, the value will be NoneThe name of the attribute can be set using the dest keyword argument to add_option(), described previously By default, arguments are taken from sysargv[1:] However, a different source of arguments can be supplied as an optional argument, arglist
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Sets the default values of particular option destinationsYou simply supply keyword arguments that specify the destinations you wish to setThe name of the keyword arguments should match the names specified using the dest parameter in add_option(), described earlier
pset_usage(usage)
Changes the usage string displayed in text produced by the --help option
Example
# foopy import optparse p = optparseOptionParser() # A simple option, with no arguments padd_option("-t", action="store_true", dest="tracing") # An option that accepts a string argument padd_option("-o", "--outfile", action="store", type="string", dest="outfile") # An option requires an integer argument padd_option("-d", "--debuglevel", action="store", type="int", dest="debug") # An option with a few choices padd_option("--speed", action="store", type="choice", dest="speed", choices=["slow","fast","ludicrous"]) # An option taking multiple arguments padd_option("--coord", action="store", type="int", dest="coord", nargs=2) # A set of options that control a common destination padd_option("--novice", action="store_const", const="novice", dest="mode") padd_option("--guru", action="store_const", const="guru", dest="mode") # Set default values for the various option destinations pset_defaults(tracing=False, debug=0, speed="fast", coord=(0,0), mode="novice") # Parse the arguments opt, args = pparse_args() # Print option values print "tracing :", opttracing print "outfile :", optoutfile print "debug :", optdebug print "speed :", optspeed print "coord :", optcoord print "mode :", optmode # Print remaining arguments print "args :", args
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Here is a short interactive UNIX session that shows how the previous code works:
% python foopy -h usage: foopy [options] options: -h, --help show this help message and exit -t -o OUTFILE, --outfile=OUTFILE -d DEBUG, --debuglevel=DEBUG --speed=SPEED --coord=COORD --novice --guru % python foopy -t -o outfiledat -d 3 --coord 3 4 --speed=ludicrous blah tracing : True outfile : outfiledat debug : 3 speed : ludicrous coord : (3, 4) mode : novice args : ['blah'] % python foopy --speed=insane usage: foopy [options] foopy:error:option --speed:invalid choice:'insane' (choose from 'slow', 'fast', 'ludicrous')