[已解决]python20课后题最后一题

清风慕竹99

以下是本人编的程序：
str1 = '''小甲鱼给的文本'''
str3 ='abcdefghiJklmnopqrstuvwxyz'
list1 =[]
length = len(str1)
for i in range(length):
    if str1 =='\n':
        continue
    if (str1 in str3) and (str1[i+1:i+4].isupper()) and (str1[i-3:i].issupper()): #找到一个小写字母，同时左右2边都是3个大写字母
        if str1[i+4].islower() and str1[i-4].islower:#左右2边的大写母后的一位是小写字母
             list1.append(str1)
   
print(list1)

问题如下： 1.出现了报错（Traceback (most recent call last):
      File "C:/Users/Administrator/Desktop/Python/测试32.py", line 111, in <module>
          if (str1 in str3) and (str1[i+1:i+4].isupper()) and (str1[i-3:i].issupper()):
         AttributeError: 'str' object has no attribute 'issupper'）
               2.不知道这个思路有没有问题，比较重要的2行代码我标红。

最佳答案

月排行榜 / 总排行榜

zltzlt

2019-10-9 22:19:11

清风慕竹99 发表于 2019-10-9 22:09
我感觉忽略换行也没太大关系啊，它只要左右2边刚好是3个大写字母。如果这个小写字母刚好在换行初左右都是 ...

换行占一个字符，那就说明在边缘的字符实际上只检测到了两个字符。

跳转到最佳答案楼层

2369520493

我觉得应该是字符才有isupper()等方法，字符串应该不能判断吧！

__mrsq__

emmm
首先，方法名是isupper() 不是issuper()
这个方法是字符串的方法
python里没有字符的概念，python里的字符就是长度为1的字符串

清风慕竹99

2369520493 发表于 2019-10-9 15:50
我觉得应该是字符才有isupper()等方法，字符串应该不能判断吧！

可以判读，全是大写isupper()得到的是true,字符串中有一个小写就是false

清风慕竹99

__mrsq__ 发表于 2019-10-9 16:07
emmm
首先，方法名是isupper() 不是issuper()
这个方法是字符串的方法

谢谢指出错误，那个确实是手误了。我改了一下，输出的是['u', 'i', 'l', 'o', 'y', 'u', 'o', 'v', 'e', 'f', 'b', 'm', 'i', 'm', 's', 'q', 'd', 'h', 't', 'g', 'l', 'c', 'o', 'a', 'n', 'c']。能帮我看下那里有问题吗？或者说逻辑或操作上有没有什么问题？

__mrsq__

清风慕竹99 发表于 2019-10-9 16:36
谢谢指出错误，那个确实是手误了。我改了一下，输出的是['u', 'i', 'l', 'o', 'y', 'u', 'o', 'v', 'e',  ...

你可以把小甲鱼的文本内容贴出来吗，然后把你的新改的代码也贴出来，不然我不太好回答

清风慕竹99

__mrsq__ 发表于 2019-10-9 16:58
你可以把小甲鱼的文本内容贴出来吗，然后把你的新改的代码也贴出来，不然我不太好回答

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qKWGc'''
str3 ='abcdefghiJklmnopqrstuvwxyz'
list1 =[]
length = len(str1)
for i in range(length):
    if str1 =='\n':
        continue
    if (str1 in str3) and (str1[i+1:i+4].isupper()) and (str1[i-3:i].isupper()): #找到一个小写字母，同时左右2边都是3个大写字母
        if str1[i+4].islower() and str1[i-4].islower:#左右2边的大写母后的一位是小写字母
             list1.append(str1)
   
print(list1)

zltzlt

帮你改了一下：

1. # -*- coding: utf-8 -*-
   
2. 
   
3. str1 = '''ACFlCTLIQlAIVMTqHFkswqbDDHtpgcWaXSSglUYKE
   
4. lqNsYCyaQXBzrFUbkAUAWAKrDgDtAlGMBqWQhpEwquZqWZJpslUfMllCwWptqINjrOBTLuPzwvXNbLCx
   
5. oFRritKRpJgBOaGPZdkUzvYnvYmAlEsVmKRXqyQUOdCBqLYyboOYeAQNLnkuiDXCiNiksSSRpDMVQQgs
   
6. TmYThnppfKSmkpjjceGLaMOvYgsvNkGENKgGtUSzVPlLMeephDKrWGNpAxBqRiCnQIuKwDZurIRsznUp
   
7. xhstMWpHdZzqeEnttlAHiWbhbIJpwKBAGsFWthBiwBDKTFzIUamELZJFLbmqOmwBIYBJIofAUyxTLUEm
   
8. LcOXzjIHFcfUfEWccbWzhVuIZMdTVsOaNsLTpHjrvFaYTnJUrqaYnUmbobfOXXtkjKjFUEhVNlPWeaIY
   
9. uABNuEDKFWiUaqQiBHGsgEmDSKiJKLkkzFWlobXIyUlDzGcwDnEOwwWxgFpebsslmKItazIYctPROSJp
   
10. ImDHusQIkoFQSmuqwdcPNERvflfHtkGTrtbQXqZUsazoxmbVTPIuuxKvfALAaGnIuIZwczCcoIRMncBs
    
11. timFGHPJPaHMPTLjsBjIwbbzKyghaDTUStzJceaYAneywwpvdiUJifPHtXmAwZPChWsDmwonzeeQCEiB
    
12. xWsJLAtrdVEOBxEaYiSabHdUwlXlDOAKzZUwozJoBGvnFttDkXdYdjQSzzhTIPfYpWVFdiFIqSbyPZIi
    
13. VoXunBPbAJVMWluPcIfHmjPeHaTyClCvTOucEYEZXbVDiZMsfeuruDGMmQEsHutzvzVmWvCoPRguBiHh
    
14. taTeaguPmNuAxzYJLEcdoApfIFBaLUqettjTJNlHZYlJZRRoKXEvFnoUHdPjDuXuTAubGODkHAokpItw
    
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106. qKWGc'''
     
107. res = ''
     
108. length = len(str1)
     
109. for i, s in enumerate(str1):
     
110.     if s == '\n':
     
111.         continue
     
112.     try:
     
113.         if s.islower():
     
114.             if str1[i + 1].isupper():
     
115.                 if str1[i + 2].isupper():
     
116.                     if str1[i + 3].isupper():
     
117.                         if str1[i - 3].isupper():
     
118.                             if str1[i - 2].isupper():
     
119.                                 if str1[i - 1].isupper():
     
120.                                     if str1[i + 4].islower():
     
121.                                         if str1[i - 4].islower():
     
122.                                             res += str1[i]
     
123.     except:
     
124.         pass
     
125.    
     
126. print(res)

复制代码

清风慕竹99

zltzlt 发表于 2019-10-9 19:25
帮你改了一下：

try 和 except是什么意思，不是很懂能稍微解释一下吗？

清风慕竹99

zltzlt 发表于 2019-10-9 19:25
帮你改了一下：

另外我的原程序上那个标红的有什么错误吗？

zltzlt

清风慕竹99 发表于 2019-10-9 21:30
try 和 except是什么意思，不是很懂能稍微解释一下吗？

try ... except ... 语句表示如果执行 try 中的语句发生错误就执行 except 中的语句。在这里是为了屏蔽（预防）IndexError 错误。

zltzlt

清风慕竹99 发表于 2019-10-9 21:31
另外我的原程序上那个标红的有什么错误吗？

str1[i-4].islower()

漏了对括号

清风慕竹99

zltzlt 发表于 2019-10-9 21:32
str1.islower()

漏了对括号

把你说的错误修改了一下，输出是这['u', 'i', 'l', 'o', 'v', 'e', 'f', 'i', 's', 'd', 'h', 'c']  ，多了几个字母。

zltzlt

清风慕竹99 发表于 2019-10-9 21:36
把你说的错误修改了一下，输出是这['u', 'i', 'l', 'o', 'v', 'e', 'f', 'i', 's', 'd', 'h', 'c']   ...

str1[i+1:i+4].isupper() 这一段有问题。

试想一下，当 str1[i+1:i+4] （假设）为 'UI\n' 时，照样返回 True，因为 isupper() 方法会忽略换行，所以要分开检测。

清风慕竹99

zltzlt 发表于 2019-10-9 21:41
str1.isupper() 这一段有问题。

试想一下，当 str1 （假设）为 'UI\n' 时，照样返回 True，因为 isupp ...

我感觉忽略换行也没太大关系啊，它只要左右2边刚好是3个大写字母。如果这个小写字母刚好在换行初左右都是3个大写字母不是也符合题目要求。

zltzlt

清风慕竹99 发表于 2019-10-9 22:09
我感觉忽略换行也没太大关系啊，它只要左右2边刚好是3个大写字母。如果这个小写字母刚好在换行初左右都是 ...

换行占一个字符，那就说明在边缘的字符实际上只检测到了两个字符。

immotral

拼写方法名错了，你可以查看一下之前的扩展阅读。
str.isuper()

清风慕竹99

zltzlt 发表于 2019-10-9 22:19
换行占一个字符，那就说明在边缘的字符实际上只检测到了两个字符。

明白了  感谢版主

清风慕竹99

immotral 发表于 2019-10-9 22:53
拼写方法名错了，你可以查看一下之前的扩展阅读。
str.isuper()

好的谢谢