小甲鱼的零基础学习python的第20讲的课后操作题，为啥我写的代码有一点出错？

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求大神指点！
原题是这样的：
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

我写的代码是：
str1 = '''  '''                                                   #字符太长，我放在下面了。
length = len(str1)
for i in range(length):
    if  2 < i < (length-2):                                 #因为这个字母不可能是前三个或者后三个，所以去掉这个范围。
        if  str1[i].islower():                                 
            if  str1[i-3:i].isupper():                        #如果这个字符前三个都是大写字母。
                if  not  str1[i-4].isupper():               #并且前面的第四个不是大写字母（这样就确保前面有且只有3个大写字母）。
                    if  str1[i+1:i+4].isupper():           #如果后三个是大写字母。
                        if  not  str1[i+4].isupper():      #并且后面第四个不是大写（同理）。
                            print(str1[i],end="")

为啥这样写，运行后得到的结果是： uilovefisdhc   正确的结果应该是ilovefishc。我的答案会多出两个字符呢？求指点！

小甲鱼原题和他写的代码都在这里：https://fishc.com.cn/forum.php?m ... peid%26typeid%3D398

长字符在这：ACFlCTLIQlAIVMTqHFkswqbDDHtpgcWaXSSglUYKE
lqNsYCyaQXBzrFUbkAUAWAKrDgDtAlGMBqWQhpEwquZqWZJpslUfMllCwWptqINjrOBTLuPzwvXNbLCx
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qKWGc

zltzlt

代码应该是这样的：

1. str1 = '''ACFlCTLIQlAIVMTqHFkswqbDDHtpgcWaXSSglUYKE
   
2. lqNsYCyaQXBzrFUbkAUAWAKrDgDtAlGMBqWQhpEwquZqWZJpslUfMllCwWptqINjrOBTLuPzwvXNbLCx
   
3. oFRritKRpJgBOaGPZdkUzvYnvYmAlEsVmKRXqyQUOdCBqLYyboOYeAQNLnkuiDXCiNiksSSRpDMVQQgs
   
4. TmYThnppfKSmkpjjceGLaMOvYgsvNkGENKgGtUSzVPlLMeephDKrWGNpAxBqRiCnQIuKwDZurIRsznUp
   
5. xhstMWpHdZzqeEnttlAHiWbhbIJpwKBAGsFWthBiwBDKTFzIUamELZJFLbmqOmwBIYBJIofAUyxTLUEm
   
6. LcOXzjIHFcfUfEWccbWzhVuIZMdTVsOaNsLTpHjrvFaYTnJUrqaYnUmbobfOXXtkjKjFUEhVNlPWeaIY
   
7. uABNuEDKFWiUaqQiBHGsgEmDSKiJKLkkzFWlobXIyUlDzGcwDnEOwwWxgFpebsslmKItazIYctPROSJp
   
8. ImDHusQIkoFQSmuqwdcPNERvflfHtkGTrtbQXqZUsazoxmbVTPIuuxKvfALAaGnIuIZwczCcoIRMncBs
   
9. timFGHPJPaHMPTLjsBjIwbbzKyghaDTUStzJceaYAneywwpvdiUJifPHtXmAwZPChWsDmwonzeeQCEiB
   
10. xWsJLAtrdVEOBxEaYiSabHdUwlXlDOAKzZUwozJoBGvnFttDkXdYdjQSzzhTIPfYpWVFdiFIqSbyPZIi
    
11. VoXunBPbAJVMWluPcIfHmjPeHaTyClCvTOucEYEZXbVDiZMsfeuruDGMmQEsHutzvzVmWvCoPRguBiHh
    
12. taTeaguPmNuAxzYJLEcdoApfIFBaLUqettjTJNlHZYlJZRRoKXEvFnoUHdPjDuXuTAubGODkHAokpItw
    
13. SlEwhjrUSlfMawWlTMciWAzVcgPcqCHIaogokYAWGsvWZzBfJqzxIkCNvHDvBkOMCyeYXzVVuRJLQIOy
    
14. BMoVPgFLOagDxyPfWxTtZQNCLOrVVclPzMNYruNUyMOBKxBvinxuGMAAfndhPsROtkOJAAJQSxpmTzXm
    
15. CmEwZOhlItvETUneqvdKLghLyREjuJWRFjVVuNMiPuvvmRaEUmjCXDVuMRAvBuHUYGKPXthWISIbueRp
    
16. uvxpmqclmrXpAGFrxhJGxQwlrbkHEmcEUooCoPqGzbrCfIWmtUKmzzXvcqbhxKcAwXCNjbJDWDndKiLK
    
17. HwaFKyhXJQgHjIaTfIJrkhUpTHJZebRertDigQtDKxGerMRgHWFTrqqZlcBjAUfTZdFlZCAEZnhzgTIy
    
18. gJSsWJjFcCVoFonAfKPTOhTxjxTRtzSKLoIOScEwBCDvWFDVGpBOpijqdwvugoYsyuIOZJTcySDrzy
    
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20. XsvyFVXfjgKuamMTsEsbeKDgAdVndyDleenPBcXWKGPcDsALDajkCEGufvbtyXUZnelqISbQnHphDoTH
    
21. RMIxMKclpWSvQHkzRhdAehBVaKYaXRPMpGaeRxvTRVFfewirvIDoGvYTAvKSoMFCLUNVFVKrYMeYtBrS
    
22. KgiBOjvliNOHLrmztypGhQjtpEQwzVfpVqsTUPvOCPzgqOuvLXJBQZHLmSwGTxEMgCAbogXombCiBDNX
    
23. BvGtXjrGWbWHtNCoRuqIZPhBQXZiNUhbmzOiyByAoMSBvusppiPVibIqmLXwXEVfcEAyNeUxaEZThULu
    
24. mkGmoLrpOEktwRluXvOmmfEWxZkxUNIqZKuzbaUmLKBYrXMmdOYLEzljzbSJnqRbSiAFyUNyyieKITkh
    
25. mvkKyosXKCaTsXQIKczJmxuqIEKeGGGwZyWTolQynlWngjDzFMlwhJFEmODeycbEfxgSRbIXySfwlhZZ
    
26. BUBhKyGBHRzWGRXAzarcmSDORvaOMOqYlcVIMwlHGtrLMhFWioqeKfvsJdTXmfQzavzSzCRrVzLFMaBT
    
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105. '''
     
106. length = len(str1)
     
107. for i in range(length):
     
108.     if 2 < i < (length-2):
     
109.         if str1[i].islower():
     
110.             if str1[i-3].isupper() and str1[i-2].isupper() and str1[i-1].isupper():
     
111.                 if not str1[i-4].isupper():
     
112.                     if str1[i+3].isupper() and str1[i+2].isupper() and str1\[i+1].isupper():
     
113.                         if not str1[i+4].isupper():
     
114.                             print(str1[i],end="")

复制代码

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zltzlt 发表于 2019-7-28 09:21
代码应该是这样的：

真的可以哎！但为什么字符串要分开确认大写啊？不可以直接确定[i : i+3]这样的区间全是大写吗？我看isupper（）定义是：（如果字符串中至少包含一个区分大小写的字符，并且这些字符都是大写，则返回 True，否则返回 False。）  不是全是大写才可以嘛，放一起有什么区别呢？求指导。我真是想破头了。。。。

熬夜伤手机

zltzlt 发表于 2019-7-28 09:21
代码应该是这样的：

我尝试将 后面的这段 ： if str1[i+3].isupper() and str1[i+2].isupper() and str1[i+1].isupper():  改成我写的 ：if str1[i+1:i+4].isupper():   。不去改前面的 发现结果也是对的。 但是前面的一旦改成我写的那种就会多出现两个字符，这是为啥呢？