>>> class move:
	def left(self):
		ptint('move left')
	def right(self):
		ptint('move right')
	def forward(self):
		ptint('move forward')
	def back(self):
		ptint('move back')
		
>>> gg = move()
>>> gg.back()
Traceback (most recent call last):
  File "<pyshell#124>", line 1, in <module>
    gg.back()
  File "<pyshell#122>", line 9, in back
    ptint('move back')
NameError: name 'ptint' is not defined
>>> class move:
	def left(self):
		print('move left')
	def right(self):
		print('move right')
	def forward(self):
		print('move forward')
	def back(self):
		print('move back')
		
>>> gg = move()
>>> gg.back()
move back
>>> gg.forward()
move forward
>>> class move:
	def moves(self):
		self.left()
		self.right()
		self.back()
		self.forward()
		
>>> gg = move()
>>> gg.moves()
Traceback (most recent call last):
  File "<pyshell#138>", line 1, in <module>
    gg.moves()
  File "<pyshell#136>", line 3, in moves
    self.left()
AttributeError: 'move' object has no attribute 'left'
>>> gg.back()
Traceback (most recent call last):
  File "<pyshell#139>", line 1, in <module>
    gg.back()
AttributeError: 'move' object has no attribute 'back'