问题链接
问题链接如下:
http://www.pythonchallenge.com/pc/def/oxygen.html
答案链接
答案链接如下:
http://www.pythonchallenge.com/pc/def/integrity.html
解题思路
页面和源码中无任何提示,但图片中有一条很明显的灰度线,考虑到灰度图取值范围为[0, 255],不妨将其转为ASCII码查看,则有如下代码:
from urllib import request
from PIL import Image
url = 'http://www.pythonchallenge.com/pc/def/oxygen.png'
response = request.urlopen(url)
oxygen = Image.open(response)
oW, oH = oxygen.size
h = oH // 2
msg = ''
# 这里的7来源于:不设置该数字时,输出结果可以看到明显的重复7次。
for w in range(0, oW, 7):
pixel = oxygen.getpixel((w, h))
msg += chr(pixel[0])
print(msg)
输出信息为:
smart guy, you made it. the next level is [105, 110, 116, 101, 103, 114, 105, 116, 121]pe_
将中括号内的数字再次转换为ASCII,则有如下代码:
from urllib import request
from PIL import Image
url = 'http://www.pythonchallenge.com/pc/def/oxygen.png'
response = request.urlopen(url)
oxygen = Image.open(response)
oW, oH = oxygen.size
h = oH // 2
msg = ''
for w in range(0, oW, 7):
pixel = oxygen.getpixel((w, h))
msg += chr(pixel[0])
# print(msg)
s = msg.index('[')
e = msg.index(']')
code = msg[s+1:e].split(',')
for c in code:
print(chr(int(c)), end='')
print('')
最终输出结果:
integrity
替换原始URL中的对应位置可以得到最终URL为:http://www.pythonchallenge.com/pc/def/integrity.html
。
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