Python challenge game - Mission3 第三关_one small letter, surrounded by exactly three big -优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_44521703/article/details/94159363

在Python Challenge的第三关中，通过分析http://www.pythonchallenge.com/pc/def/equality.html页面源代码，利用'EXACTLY'提示找到解谜关键。经过尝试和学习正则表达式，得到结果'linkedlist'，指向http://www.pythonchallenge.com/pc/def/linkedlist.html。但初次尝试未成功，后续学习正则表达式后完成挑战。

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打开http://www.pythonchallenge.com/pc/def/equality.html，发现就一句话是有用信息

One small letter, surrounded by EXACTLY three big bodyguards on each of its sides.

，因此进入源代码看看：

还是乱七八糟的注释：直接把注释存成文件，

with open("python_equality.txt", encoding='UTF-8') as f0:
    f0 = f0.read()
    for i in range(2, len(f0) - 3):
        if 'a' <= f0[i] <= 'z':
            if 'A' <= f0[i - 1] <= 'Z' and 'A' <= f0[i - 2] <= 'Z' and 'A' <= f0[i - 3] <= 'Z':
                if 'A' <= f0[i +1] <= 'Z' and 'A' <= f0[i + 2] <= 'Z' and 'A' <= f0[i + 3] <= 'Z':
                    print(f0[i], end="")

运行结果有点懵逼：

jfeiauzroivgzbmpszazlutnwsdofbiwqidjbzshfrblqgsbydajygcbjcwggtdmfjeobhcmdlzxajvitekcgpkcfwqbvkoixetpiiljanvqjjgtcpadjkgcbluaidgumcdskunujfcjhfmbzpkzsasdxsqqdqlaeisjezfjfdaoljapywxjthqjknnednxnsahxqedoeqsdcmltcsnwakjxdtytfaalhlgabekfmyimwrkffydghiunlriwgkuzqljjbsxguytfsatejmdwkbfbzifdknpcqimvehxujkszbuyutmsompijjojspbwlroefiwmqrsjstdjhfwxhcnthsoosmjoqtufoxvpvpjkgiaqgofrhyufxxdnjiwtfqusbkdeakunjgkfnpibuklgjougnivhgixsnekxgrirbsllpuaouvhzbilbjirmqqxtktgcnkdljoasnexwtgvwjegurngksokjtroovpcmykzgeolwynsyfideomflmkwmj

仔细看看原来页面，发现问题在与exactly：于是再改：

with open("python_equality.txt", encoding='UTF-8') as f0:
    f0 = f0.read()
    for i in range(2, len(f0) - 3):
        if 'a' <= f0[i] <= 'z':
            if 'A' <= f0[i - 1] <= 'Z' and 'A' <= f0[i - 2] <= 'Z' and 'A' <= f0[i - 3] <= 'Z':
                if 'A' <= f0[i +1] <= 'Z' and 'A' <= f0[i + 2] <= 'Z' and 'A' <= f0[i + 3] <= 'Z':
                    if 'a' <= f0[i + 4] <= 'z' and 'a' <= f0[i -4] <= 'z':
                        print(f0[i], end="")

解法好糙，先不管了，据说可以正则表达式来跑，但是。。。不会。。。。以后会了再回来改吧。。。。

跑出来 linkedlist，应该是最终结果了，试试。

http://www.pythonchallenge.com/pc/def/linkedlist.html

我去，就给出给linkedlist.php，又跑错了？？

今天先到这里吧，还得干正事去呢。。。

-----------------------------------------------------------------------------------------------

原来就是：http://www.pythonchallenge.com/pc/def/linkedlist.php

懵逼中进入下一关

========初学了正则表达式，回来看看================

import re

with open("python_equality.txt", encoding='UTF-8') as f0:
    f0 = f0.read()
q = r'[a-z][A-Z]{3}[a-z][A-Z]{3}[a-z]'
q1 = re.findall(q, f0)
for i in q1:
    print(i[4], end = '')

输出： linkedlist，收官