#加减乘除运算

class Number():
	def n_b=input('请输入运算数字')
class Yunsuan():
	def __init__(self):
		self.Now_nber = 0
		self.YunSF='+'
		self.YunSF='-'
		self.YunSF='*'
		self.YunSF='/'
	def operation(self):
		print
class menu():
	def all_operation(Yunsuan):
		while True:
			n
			Yunsuan	
