def __str__(self):
    """Return a string representation of the binary expression."""
    return 'Binary Expression: {0:s} {1:s}'.format(
        self.operator, [str(x) for x in self.args])
def __str__ ( self ) : return 'Binary Expression: {0:s} {1:s}' . format ( self . operator , [ str ( x ) for x in self . args ] )
Return a string representation of the binary expression.