This object replaces a label's icon with a spinning progress icon when
  start() is called. The original icon is restored when stop() is 
  called.
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          | __init__(self,
        label) x.__init__(...) initializes x; see help(type(x)) for signature
 |  |  | 
    |  | 
        
          | update(self) Advance the animation by one frame.
 |  |  | 
    |  | 
        
          | start(self) Start the animation
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    |  | 
        
          | stop(self) Stop the animation and restore the original icon
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    | Inherited from object:__delattr__,__format__,__getattribute__,__hash__,__new__,__reduce__,__reduce_ex__,__repr__,__setattr__,__sizeof__,__str__,__subclasshook__ |