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本帖最后由 shenshuai 于 2019-10-14 07:39 编辑
各位大佬们,我看了论坛里的一些朋友发的这道题答案之后我还是有些点不是很理解。希望大佬们能帮忙解释一些,谢谢了。
原题目问题:
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:Y5d|MAp
Y5d|MAp
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
以下是我看的其他朋友的答案,有些地方不是很理解。str1 = '''ACFlCTLIQlAIVMTqHFkswqbDDHtpgcWaXSSglUYKE
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qKWGc'''
i = 3 #这里为什么要=3?为什么不是从0开始?
length = len(str1)
while i < length - 4 :#这里为什么要length - 4?
if str1[i].islower() :
if str1[i + 1].isupper() and str1[i + 2].isupper() and str1[i + 3].isupper():
if str1[i-4].islower() :
if str1[i - 1].isupper() and str1[i - 2].isupper() and str1[i - 3].isupper() :
if str1[i+4].islower() : #这里+4又是为什么呀?
print(str1[i],end = '')
i += 1
else :
i += 1
else:
i += 1
else :
i += 1
else :
i += 1
else :
i += 1
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