python第20讲课后习题

白板鱼人

1. 请用已学过的知识编写程序，找出小甲鱼藏在下边这个长字符串中的密码，密码的埋藏点符合以下规律：
    a) 每位密码为单个小写字母
    b) 每位密码的左右两边均有且只有三个大写字母
string1 = input("请输入要查询的字符串：")
length = len(string1)
password = ""
for i in range(3,length - 4):
    if string1[i] == '\n':
        continue
    if string1[i].islower():
        if string1[i - 3,i - 1].isupper() and string1[i + 1,i + 3].isupper():
            if not (string1[i - 4].isupper() or string1[i + 4].isupper()):
                password.append(string[i])
print("您的密码是：" + password)

运行输入字符串后显示出错：Traceback (most recent call last):
  File "C:/Users/15636/Desktop/密码查询.py", line 8, in <module>
    if string1[i - 3,i - 1].isupper() and string1[i + 1,i + 3].isupper():
TypeError: string indices must be integers
请问大佬们哪里不对呀？

_荟桐_

第8行改成：if string1[i - 3:i - 1].isupper() and string1[i + 1:i + 3].isupper():
索引用冒号，不是逗号

白板鱼人

_荟桐_ 发表于 2020-4-22 17:37
改成：if string1.isupper() and string1.isupper():
索引用冒号，不是逗号

好的已改正，没有报错，但是也没有显示结果（没有得到密码），请问哪里仍存在问题呢？

斐波纳税

第七行：if string1.islower():是无意义的啊，因为要破解的密码里必定存在小写字母，而且你没有在下面的语句里改变原始字符串的值，所以这个条件始终成立。
而且后面的字符串方法的使用和切片好像也有些问题。建议在[拓展阅读]中找到字符串方法的作用，再自己举例子尝试运行一下，会更容易理解。
还有上传代码最好用论坛自带的代码编辑器。

_荟桐_

白板鱼人 发表于 2020-4-22 17:46
好的已改正，没有报错，但是也没有显示结果（没有得到密码），请问哪里仍存在问题呢？

老哥，能把那个字符串发上来吗

_荟桐_

string = 'AAAaAAAaAAAaAAA'
password = ""

for i in range(len(string)):
    if string[i] == '\n':  #判断是否是换行
        continue
    if string[i].isupper() and i <= len(string)-6:
            if (string[i]+string[i+1]+string[i+2]).isupper():   #判断密码左边的三个字符
                if string[i+3].islower():               #判断密码是否是小写
                    if (string[i+4]+string[i+5]+string[i+6]).isupper():  #右边
                        password += string[i+3]       
print(password)

↑应该能运行↑

白板鱼人

斐波纳税 发表于 2020-4-22 18:14
第七行：if string1.islower():是无意义的啊，因为要破解的密码里必定存在小写字母，而且你没有在下面的语 ...

啊不好意思是我复制粘贴时丢失了索引号，抱歉抱歉!

白板鱼人

_荟桐_ 发表于 2020-4-22 18:17
老哥，能把那个字符串发上来吗

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