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Python Library Reference |  |
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Python Library Reference | |
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OptionParser supports several other public methods:
set_usage(usage)
Set the usage string according to the rules described above for the
usage constructor keyword argument. Passing None sets the
default usage string; use SUPPRESS_USAGE to suppress a usage
message.
enable_interspersed_args(), disable_interspersed_args()
Enable/disable positional arguments interspersed with options, similar
to GNU getopt (enabled by default). For example, if "-a" and
"-b" are both simple options that take no arguments, optparse
normally accepts this syntax:
prog -a arg1 -b arg2
and treats it as equivalent to
prog -a -b arg1 arg2
To disable this feature, call disable_interspersed_args(). This
restores traditional Unix syntax, where option parsing stops with the
first non-option argument.
set_defaults(dest=value, ...)
Set default values for several option destinations at once. Using set_defaults() is the preferred way to set default values for options, since multiple options can share the same destination. For example, if several ``mode'' options all set the same destination, any one of them can set the default, and the last one wins:
parser.add_option("--advanced", action="store_const",
dest="mode", const="advanced",
default="novice") # overridden below
parser.add_option("--novice", action="store_const",
dest="mode", const="novice",
default="advanced") # overrides above setting
To avoid this confusion, use set_defaults():
parser.set_defaults(mode="advanced")
parser.add_option("--advanced", action="store_const",
dest="mode", const="advanced")
parser.add_option("--novice", action="store_const",
dest="mode", const="novice")
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