a=int(raw_input("please input number:")) //输入字符串兵转换成int
case:
#/bin/pythona
a=int(raw_input("please input :"))
b=int(raw_input("please input :"))
print a+b
print a-b
print a*b
print a/b
python 变量输入
原文：http://10258476.blog.51cto.com/10248476/1652959
