第20讲动动手1 后边看不太懂,Python交流,技术交流,鱼C论坛

奔跑的赵云 发表于 2020-11-16 00:10:43

第20讲动动手1 后边看不太懂

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：i=>|3KYD
i=>|3KYD
a) 每位密码为单个小写字母Powered by bbs.fishc.com
b) 每位密码的左右两边均有且只有三个大写字母j~:y
3u=9m7_0 Pzy"pCV#RdwA,21^[t
str1 = '''ABSaDKSbRIHcRHGcdDIF'''

countA = 0# 统计前边的大写字母
countB = 0# 统计小写字母
countC = 0# 统计后边的大写字母
length = len(str1)

for i in range(length):
if str1 == '\n':
   continue

"""
|如果str1是大写字母：
|-- 如果已经出现小写字母：
|-- -- 统计后边的大写字母
|-- 如果未出现小写字母：
|-- -- 清空后边大写字母的统计
|-- -- 统计前边的大写字母
"""
if str1.isupper():
   if countB:
         countC += 1
   else:
         countC = 0
         countA += 1

"""
|如果str1是小写字母：
|-- 如果小写字母前边不是三个大写字母（不符合条件）：
|-- -- 清空所有记录，重新统计
|-- 如果小写字母前边是三个大写字母（符合条件）：
|-- -- 如果已经存在小写字母：
|-- -- -- 清空所有记录，重新统计（出现两个小写字母）
|-- -- 如果该小写字母是唯一的：
|-- -- -- countB记录出现小写字母，准备开始统计countC
"""
if str1.islower():
   if countA != 3:
         countA = 0
         countB = 0
         countC = 0
   else:
         if countB:
            countA = 0
            countB = 0
            countC = 0
         else:
            countB = 1
            countC = 0
            target = i

"""
|如果前边和后边都是三个大写字母：
|-- 如果后边第四个字母也是大写字母（不符合条件）：
|-- -- 清空记录B和C，重新统计                                     ##这里看不太明白为什么如果后边有四个大写字母的话 countA为什么不清零没有意义了啊
|-- 如果后边仅有三个大写字母（符合所有条件）：
|-- -- 打印结果，并清空所有记录，进入下一轮统计
"""
if countA == 3 and countC == 3:
   if i+1 != length and str1.isupper():
         countB = 0
         countC = 0
   else:
         print(str1, end='') ##这里也是为什么countA 不清零清零不是更好吗
         countA = 3
         countB = 0
         countC = 0

奔跑的赵云 发表于 2020-11-16 00:11:19

今天问题巨多感谢各位大佬

jackz007 发表于 2020-11-16 00:37:12

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qKWGc'''

str = ''
for x in str1:
str += x . strip()
str = 'a' + str + 'a'
passwd = ''
for k in range(4 , len(str) - 4):
if str . islower() and str . isupper() and str . islower() and str . isupper() and str . islower():
passwd += str
print(passwd)

gonff 发表于 2020-11-16 01:14:36

如果在后面第4个大写字母清零countA，那么如果有第5,6,7个大写字母，就会被当成3个大写字母。
而有下面这几行：
if str1.islower():
   if countA != 3:
         countA = 0
         countB = 0
         countC = 0
这几行保证了，不清零countA也没关系，因为!=3的情况也包含大于3，所以在这里（再次遇到小写时）会重新清零的。

页: [1]

鱼C论坛's Archiver

第20讲 动动手1 后边看不太懂

第20讲动动手1 后边看不太懂