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class Switch --- switch object
==============================
A Switch object is used to control a push-button switch.
Usage::
sw = pyb.Switch() # create a switch object
sw() # get state (True if pressed, False otherwise)
sw.callback(f) # register a callback to be called when the
# switch is pressed down
sw.callback(None) # remove the callback
Example::
pyb.Switch().callback(lambda: pyb.LED(1).toggle())
Constructors
------------
.. class:: pyb.Switch()
Create and return a switch object.
Methods
-------
.. method:: switch()
Return the switch state: ``True`` if pressed down, ``False`` otherwise.
.. method:: switch.callback(fun)
Register the given function to be called when the switch is pressed down.
If ``fun`` is ``None``, then it disables the callback.
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