def init(driverName=None, debug=False):
try:<EOL><INDENT>eng = _activeEngines[driverName]<EOL><DEDENT>except KeyError:<EOL><INDENT>eng = Engine(driverName, debug)<EOL>_activeEngines[driverName] = eng<EOL><DEDENT>return eng<EOL>
Constructs a new TTS engine instance or reuses the existing instance for
the driver name.

@param driverName: Name of the platform specific driver to use. If
    None, selects the default driver for the operating system.
@type: str
@param debug: Debugging output enabled or not
@type debug: bool
@return: Engine instance
@rtype: L{engine.Engine}