记录python2（一）

1.带文本菜单，取三数之和或平均值

# -*- conding：UTF-8 -*-print 'Now you will input three numbers!'n1 = int(raw_input('First number: '))n2 = int(raw_input('Second number: '))n3 = int(raw_input('Last number: '))while True:    print '-'* 30    print '菜单：\n1.求3个数的和\n2.取平均值\n3.退出'    print '-'* 30    num = int(raw_input('Please picks: '))    if num == 1:        sum = n1 + n2 + n3        print sum    elif num == 2:        avg = (n1 + n2 + n3)/3        print avg    elif num == 3:        break    else:        print 'Invalid option,try again!'