There is no constants for DBUS_MESSAGE_TYPE_{METHOD_{CALL,RETURN},ERROR,SIGNAL}. I need them for "if msg.get_type() == 4" <smvc>I would accept patches that added these constants to dbus.lowlevel too <smvc>(please file a bug on bugs.freedesktop.org).
Seems you didn't get my not-so-subtle hint that I wanted a patch, so I wrote one myself :-)
Fixed in 0.83.1
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