""" A demonstration of Python class, adapted from course notes by
other CSCI 203 instructor(s)

Xiannong Meng
2016-10-27
"""

class Bird:
    color = 'Yellow'          # class field
    
    def __init__( self ):     # constructor
        """ Create an object
        """
        self.weight = 10      # instance field, no units ;0)

    def __str__( self ):
        """ The string representation of the object
        """
        return Bird.color + " Hello."

    def fly( self ):          # instance method
        """ An example of method
        """
        if self.weight > 15:
            self.lighten_the_load()     # execute (or call) another method
        else:
            print(Bird.color, " IS FLYING!!!")

    def lighten_the_load( self ):
        """ Another example of method
        """
        print('Splat!')
        self.weight -= 5

    def eat( self, food_weight ):
        """  Another example of method
        """
        self.weight = self.weight + food_weight


#sparrow = Bird()

#print( sparrow )
#sparrow.fly()
#sparrow.eat( 20 )
#sparrow.fly()