(self)
return self.right - self.left
Return the length of the interval. Take care when the left or
        right sides are infinite.
Return the length of the interval. Take care when the left or
        right sides are infinite.
Return the length of the interval . Take care when the left or right sides are infinite .
def length(self):
        """Return the length of the interval. Take care when the left or
        right sides are infinite.

        """
        return self.right - self.left
def length ( self ) : return self . right - self . left