code: def setPinch(self,
                   topLeft=None,
                   topRight=None,
                   bottomLeft=None,
                   bottomRight=None):
          
          pinch = list(self._pinch)
          if topLeft is not None:
              pinch[0] = topLeft
          if topRight is not None:
              pinch[1] = topRight
          if bottomLeft is not None:
              pinch[2] = bottomLeft
          if bottomRight is not None:
              pinch[3] = bottomRight
          
          self._pinch = tuple(pinch)
docs: Sets the pinch amounts for this node.  This
          will pinch in the borders based on the inputed information generating
          a variety of edged shapes.  If the keyword is not specified, then it
          will use the already existing pinch value for that section.
          
          :param      left   | <int> || None
                      top    | <int> || None
                      right  | <int> || None
                      bottom | <int> || None