Class Variables

files - [optional] List of option configuration files to load
    (backward compatibility) If a single string is passed it is
                             automatically placed in a file list

Overrides: object.__init__

Add an option.

key - the name of the variable, or a list or tuple of arguments
help - optional help text for the options
default - optional default value
validator - optional function that is called to validate the option's value
            Called with (key, value, environment)
converter - optional function that is called to convert the option's value before
            putting it in the environment.

Add a list of options.

Each list element is a tuple/list of arguments to be passed on
to the underlying method for adding options.

Example:
  opt.AddVariables(
    ('debug', '', 0),
    ('CC', 'The C compiler'),
    ('VALIDATE', 'An option for testing validation', 'notset',
     validator, None),
    )

Update an environment with the option variables.

env - the environment to update.

Saves all the options in the given file.  This file can
then be used to load the options next run.  This can be used
to create an option cache file.

filename - Name of the file to save into
env - the environment get the option values from

Generate the help text for the options.

env - an environment that is used to get the current values
      of the options.

format_

Value:

''' %s: %s default: %s actual: %s aliases: %s '''