def __str__(self):
	""" String representation of the circle equation, standard form ,centre and radius """

	#Equation raises radius value < 0
	assert self.__radius > 0, "<Radius value should be greater than zero"

	return ( "\n<Equation for the circle of radius (%s)\
		centred at (%s,%s) is : \n\n%s < -- > %s" ) % \
		(self.__radius,self.__x,self.__y,self._s,self._v)
 String representation of the circle equation, standard form ,centre and radius 
recipes/Python/576531_Circle/recipe-576531.py