#filename:classdemo.py

class test:

	'''just person'''

	a=1

	b=2

	c=0

	def __init__(self):

		'''just person's init'''

		test.c=test.c+1

	def aadnb(self):

		return self.a+self.b

	def __del__(self):

		test.c=test.c-1

p=test()

print test.c

p.a=5

p.b=7

p1=test()

print test.c

b=p1.aadnb()

a=p.aadnb()

print a

print b

del p

print test.c

print test.__doc__

print test.__init__.__doc__

print p1