# possible to represent with this clock class).
cc = self._create_clock_class(frequency=1, offset=bt2.ClockClassOffset(10000))
sc = tc.create_stream_class(default_clock_class=cc,
+ supports_packets=True,
packets_have_beginning_default_clock_snapshot=True,
packets_have_end_default_clock_snapshot=True)
ec1 = sc.create_event_class(name='event 1')