
class Student(object):
	def __init__(self):
		self.name='Machael'
	def __getattr__(self,attr):
		if attr=='score':
			return 99
		raise AttributeError('\'Student\' object has no attribute \'%s\'' % attr)

s=Student()
print(s.name)
print(s.score)
print(s.ttr)
