class_docstr: Asynchronous equivalent to threading.Event.
  
  Class implementing event objects. An event manages a flag that can be set
  to true with the set() method and reset to false with the clear() method.
  The wait() method blocks until the flag is true. The flag is initially
  false.
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code: def __init__(self):
      self._waiters = collections.deque()
      self._value = False
  
imports: import collections
  import enum
  from .None import exceptions
  from .None import mixins
label_desc: Use image node_id 1 to create a new Event object from inherited base classes: mixins with example: obj = Event()