def make_instance(self, command):
ist = lib.EnvMakeInstance(self._env, command.encode())<EOL>if ist == ffi.NULL:<EOL><INDENT>raise CLIPSError(self._env)<EOL><DEDENT>return Instance(self._env, ist)<EOL>
Create and initialize an instance of a user-defined class.

        command must be a string in the form:

        (<instance-name> of <class-name> <slot-override>*)
        <slot-override> :== (<slot-name> <constant>*)

        Python equivalent of the CLIPS make-instance command.