error sending event with extensions

[ryandawsonuk]

Error at

sdk-python/cloudevents/sdk/event/base.py

Line 157 in f51b5e4

for key, value in props.get("extensions"):

I get:

cloudevents/sdk/event/base.py", line 157, in MarshalBinary
    for key, value in props.get("extensions"):
ValueError: too many values to unpack (expected 2)

I think it should be props.get("extensions").items().

I think I'm hitting this because I'm creating one event from another and specifically passing on the extensions using SetExtensions rather adding each as an item:

            revent = (
                v02.Event().
                    SetContentType("application/json").
                    SetData(responseStr).
                    SetEventID(resp_event_id).
                    SetSource(self.model.event_source()).
                    SetEventType(self.event_type).
                    SetExtensions(event.Extensions())
            )