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鱼C论坛»论坛 › 技术交流 › Python交流 › 二十讲课后作业
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[已解决]二十讲课后作业

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赵从文芜湖123
发表于 2023-1-21 11:56:20 | 显示全部楼层 |阅读模式

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x
我的答案：
a = 0
list1 = []
length = len(str1)
for i in str1:
    if i.isupper():
        if a <= length - 7:
            if str1[a-1].islower() and str1[a+1:a+3].isupper() and str1[a+3].islower() and str1[a+4:a+7].isupper() and str1[a+7].islower():
                list1.append(str1[a+3])
    a = a + 1
print(list1)

程序结果：
['u', 'i', 'l', 'o', 'v', 'e', 'f', 'i', 's', 'h', 'c']
多了个 ‘u’
问题出在哪里？请问如何改正？

str1 = ACFlCTLIQlAIVMTqHFkswqbDDHtpgcWaXSSglUYKE
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qKWGc
最佳答案
月排行榜 / 总排行榜
jackz007
2023-1-21 14:01:56
       提取前，先把 str1 处理一下，剔除每一行末尾的 '\n' 就好了。
str1 = 'a' + '' . join(str1 . split('\n')) + 'a'
想知道小甲鱼最近在做啥？请访问 -> ilovefishc.com
回复

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jackz007
发表于 2023-1-21 14:01:56 | 显示全部楼层    本楼为最佳答案   
       提取前，先把 str1 处理一下，剔除每一行末尾的 '\n' 就好了。
str1 = 'a' + '' . join(str1 . split('\n')) + 'a'
想知道小甲鱼最近在做啥？请访问 -> ilovefishc.com
回复 支持 反对

使用道具 举报

jackz007
发表于 2023-1-21 14:09:28 | 显示全部楼层 
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qKWGc'''

str1 , txt = 'a' + '' . join(str1 . split('\n')) + 'a' , ''
for k in range(4 , len(str1) - 4):
    if (str1[k-4] + str1[k] + str1[k + 4]) . islower() and (str1[k - 3 : k] + str1[k + 1 : k + 4]) . isupper() : txt += str1[k]
print(txt)
        运行实况：
D:\[00.Exercise]\[Python]>python x.py
ilovefishc

D:\[00.Exercise]\[Python]>
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赵从文芜湖123
 楼主| 发表于 2023-1-21 18:27:55 | 显示全部楼层
jackz007 发表于 2023-1-21 14:01
提取前，先把 str1 处理一下，剔除每一行末尾的 '\n' 就好了。

亲爱的UU，为啥要收尾加上“a”呢？
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赵从文芜湖123
 楼主| 发表于 2023-1-21 18:40:10 | 显示全部楼层
赵从文芜湖123 发表于 2023-1-21 18:27
亲爱的UU，为啥要收尾加上“a”呢？

开头加个“a”，我好像明白了，因为如果第一个是大写字母的话，会判断前一个字母是否为小写，这时候会变成[-1]，加个“a”可能就是这样想的吧？后面那个“a”没有也可以吧？
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jackz007
发表于 2023-1-21 19:38:21 | 显示全部楼层
本帖最后由 jackz007 于 2023-1-21 19:53 编辑
赵从文芜湖123 发表于 2023-1-21 18:40
开头加个“a”，我好像明白了，因为如果第一个是大写字母的话，会判断前一个字母是否为小写，这时候会变 ...


      因为这道题说，密码字符是小写字母，其两边有且仅有3个大写字母，意思是说如果有第 4 个字符存在，这个字符一定是一个小写字母，这也必须作为密码字符的判别条件。可是，第 4 个字符在字符串的首尾并不存在，这就意味着字符串的首尾和字符串内部需要设置不同的判别条件，将会使代码编写复杂化，通过在字符串首尾各添加一个小写字母之后，使整个字符串的判别条件一致起来。

      我还有另一个回帖，展示了我改写的完整代码，这个帖子目前还没有通过审核。
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赵从文芜湖123
 楼主| 发表于 2023-1-21 22:35:20 | 显示全部楼层
jackz007 发表于 2023-1-21 19:38
因为这道题说，密码字符是小写字母，其两边有且仅有3个大写字母，意思是说如果有第 4 个字符存在 ...

嗯嗯，大致明白了
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赵从文芜湖123
 楼主| 发表于 2023-1-21 22:39:03 | 显示全部楼层
赵从文芜湖123 发表于 2023-1-21 22:35
嗯嗯，大致明白了

我的这句：if a <= length - 7: 可以判断尾部字符
首字符确实在我写的代码里，判断不了，任意加一个小写字母就可以了，所以
str1 = 'a' + '' . join(str1 . split('\n')) + 'a' 最后这个“a”可以不要
你看看我说的对吗？
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chinajz
发表于 2023-1-21 23:25:37 | 显示全部楼层
完全正常呀。
a = 0
str1 = 'str1 = ACFlCTLIQlAIVMTqHFkswqbDDHtpgcWaXSSglUYKE\
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qKWGc'
list1 = []
length = len(str1)
for i in str1:
    if i.isupper():
        if a <= length - 7:
            if str1[a-1].islower() and str1[a+1:a+3].isupper() and str1[a+3].islower() and str1[a+4:a+7].isupper() and str1[a+7].islower():
                list1.append(str1[a+3])
    a = a + 1
print(list1)
运行结果：
$ python test1
['i', 'l', 'o', 'v', 'e', 'f', 'i', 's', 'h', 'c']
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chinajz
发表于 2023-1-21 23:37:43 | 显示全部楼层 
a = 0
str1 = 'ACFlCTLIQlAIVMTqHFkswqbDDHtpgcWaXSSglUYKE\
lqNsYCyaQXBzrFUbkAUAWAKrDgDtAlGMBqWQhpEwquZqWZJpslUfMllCwWptqINjrOBTLuPzwvXNbLCx\
oFRritKRpJgBOaGPZdkUzvYnvYmAlEsVmKRXqyQUOdCBqLYyboOYeAQNLnkuiDXCiNiksSSRpDMVQQgs\
TmYThnppfKSmkpjjceGLaMOvYgsvNkGENKgGtUSzVPlLMeephDKrWGNpAxBqRiCnQIuKwDZurIRsznUp\
#......
qKWGc'
list1 = []
length = len(str1)
for i in str1:
    if i.isupper():
        if a <= length - 7:
            if str1[a-1].islower() and str1[a+1:a+3].isupper() and str1[a+3].islower() and str1[a+4:a+7].isupper() and str1[a+7].islower():
                list1.append(str1[a+3])
    a = a + 1
print(list1)

运行结果正常
['i', 'l', 'o', 'v', 'e', 'f', 'i', 's', 'h', 'c']
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chinajz
发表于 2023-1-21 23:46:01 | 显示全部楼层
test.jpg
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赵从文芜湖123
 楼主| 发表于 2023-1-22 00:54:05 | 显示全部楼层
chinajz 发表于 2023-1-21 23:46

C:\Users\ll\Desktop\1
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赵从文芜湖123
 楼主| 发表于 2023-1-22 00:59:00 | 显示全部楼层
chinajz 发表于 2023-1-21 23:46

不知道怎么发图片 笑哭
我运行的结果还是： ['u', 'i', 'l', 'o', 'v', 'e', 'f', 'i', 's', 'h', 'c']

是不是和str1的格式有关，我的字符串右边末尾没有你的\,我是用str1 = """words""" 这样的
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chinajz
发表于 2023-1-22 08:29:59 | 显示全部楼层
是的，str1='''words'''
可以：
str1='''words'''
str1=str1.replace("\n", "")
list1 = []
length = len(str1)
for i in str1:
    if i.isupper():
        if a <= length - 7:
            if str1[a-1].islower() and str1[a+1:a+3].isupper() and str1[a+3].islower() and str1[a+4:a+7].isupper() and str1[a+7].islower():
                list1.append(str1[a+3])
    a = a + 1
print(list1)
想知道小甲鱼最近在做啥？请访问 -> ilovefishc.com
回复 支持 反对

使用道具 举报

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