python人民币美元汇率双向兑换计算

 代码

#coding=utf-8 #中文
#第6关：人民币美元汇率双向兑换计算
number = input()
result = 0
astring = 'USD'
bstring = 'CNY'
print ("numbur[3:]: ", number[3:])
print(number[0:3] == astring)
if(number[0:3] == astring):
        b=float(number[3:]) #把字符串转为数字类型，重新赋值,
        print(b)
        c = b * 7.0227
        print(c)
        print('兑换成人民币是{:.2f}元'.format(c))
elif(number[0:3] == bstring):
        b = float(number[3:])  # 把字符串转为数字类型，重新赋值,
        print(b)
        c = b * 7.0227
        print(c)
        print('兑换成美元是{:.2f}元'.format(c/ 7.0227))
else:
    print("输入格式错误")