def save_option(self, path, section, option, value):
"""
Write the specified Section.Option to the config file specified by path.
Replace any previous value. If the path doesn't exist, create it.
Also add the option the the in-memory config.
"""
config = ConfigParser()
config.read(path)
if not config.has_section(section):
config.add_section(section)
config.set(section, option, value)
fp = open(path, 'w')
config.write(fp)
fp.close()
if not self.has_section(section):
self.add_section(section)
self.set(section, option, value)