[已解决]python20讲课后题，找密码，求助28大的鱼友们

fishbb

   答案的程序不是很看得懂，
题目：
    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



答案：
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[i] == '\n':
        continue

    """
    |如果str1[i]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[i].isupper():
        if countB:
            countC += 1
        else:
            countC = 0
            countA += 1

    """
    |如果str1[i]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[i].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
    |-- 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[i+1].isupper():
            countB = 0
            countC = 0
        else:
            print(str1[target], end='')
            countA = 3
            countB = 0
            countC = 0

最佳答案

月排行榜 / 总排行榜

阴阳神万物主

2019-10-12 17:31:50

答案程序的本质就是：遍历整个字符串，将小写字母之前的大写字符计数为 countA ，超过3则不符合条件，重置为0，遇到小写字母计数为 countB 超过1则不符合条件，重置为0，小写字母之后的大写字符计数为 countC ，超过3则不符合条件，重置为0，符合条件的就输出。

跳转到最佳答案楼层

凌九霄

这个用正则比较简单

import re
str1 = '''ACFlCTLIQlAIVMTqHFkswqbDDHtpgcWaXSSglUYKE
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qKWGc'''

result = re.findall(r'(?<=[a-z][A-Z]{3})[a-z](?=[A-Z]{3}[a-z])',str1)

print(result)

阴阳神万物主

答案程序的本质就是：遍历整个字符串，将小写字母之前的大写字符计数为 countA ，超过3则不符合条件，重置为0，遇到小写字母计数为 countB 超过1则不符合条件，重置为0，小写字母之后的大写字符计数为 countC ，超过3则不符合条件，重置为0，符合条件的就输出。