def __init__(self, value):
self.state = <NUM_LIT:0><EOL>self.value = value<EOL>self.position = (<NUM_LIT:0>, <NUM_LIT:0>)<EOL>self.size = (<NUM_LIT:0>, <NUM_LIT:0>)<EOL>
Default key constructor.

        :param value: Value of this key which also is the label displayed to the screen.