python nested class

[Vedanta Barooah]

greetings....

in a python nested class is it possible to change the value of the
parent class's variable without actually creating an instance of the
parent class, consider this code:

class mother:
	x=0
	def __init__(self):
		self.x=1
	def show(self):
		print self.x
	class child:
		def increase(self,num):
			# mother.increase=num
o = mother()
o.show()
y=mother.child()
y.increase(20)
# this should print 20
o.show()

..... is it possible somehow ???

thanks and regards,
vedanta