白板鱼人 发表于 2020-4-22 17:35:16

python第20讲课后习题

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 == '\n':
      continue
    if string1.islower():
      if string1.isupper() and string1.isupper():
            if not (string1.isupper() or string1.isupper()):
                password.append(string)
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.isupper() and string1.isupper():
TypeError: string indices must be integers
请问大佬们哪里不对呀?

_荟桐_ 发表于 2020-4-22 17:37:45

本帖最后由 _荟桐_ 于 2020-4-22 17:45 编辑

第8行改成:if string1.isupper() and string1.isupper():
索引用冒号,不是逗号

白板鱼人 发表于 2020-4-22 17:46:34

_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 发表于 2020-4-22 18:14:42

本帖最后由 斐波纳税 于 2020-4-22 18:47 编辑

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_ 发表于 2020-4-22 18:17:38

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{:10_266:}

_荟桐_ 发表于 2020-4-22 18:25:53

string = 'AAAaAAAaAAAaAAA'
password = ""

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


↑应该能运行↑

白板鱼人 发表于 2020-4-22 22:46:41

本帖最后由 白板鱼人 于 2020-4-22 22:54 编辑

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 发表于 2020-4-22 22:51:35

_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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