Pygame also has objects to store the type and attributes of a given event. The type is an integer that is stored inside a constant. These are EventType objects, and are themselves attributes of the Event object. Events of a certain type are guaranteed to have CERTAIN attributes. Here is a list of all event types and the attributes they each have:

TYPE                     ATTRIBUTE
QUIT                     none
ACTIVEEVENT       gain, state
KEYDOWN           key, mod, unicode, scancode
KEYUP                  key, mod
MOUSEMOTION       pos, rel, buttons
MOUSEBUTTONUP     pos, button
MOUSEBUTTONDOWN   pos, button
JOYAXISMOTION     joy (deprecated), instance_id, axis, value
JOYBALLMOTION     joy (deprecated), instance_id, ball, rel
JOYHATMOTION      joy (deprecated), instance_id, hat, value
JOYBUTTONUP       joy (deprecated), instance_id, button
JOYBUTTONDOWN     joy (deprecated), instance_id, button
VIDEORESIZE       size, w, h
VIDEOEXPOSE       none
USEREVENT         code