Python Challenge - Level 18

Problem

Solution

The difference is "brightness"... so go to

http://www.pythonchallenge.com/pc/return/brightness.html

In HTML source:

<!-- maybe consider deltas.gz -->

Download: http://www.pythonchallenge.com/pc/return/deltas.gz

>>> print(gzip.open("deltas.gz").read().decode())

You will see the data consists roughly two columns.

import gzip, difflib

data = gzip.open("deltas.gz")
d1, d2 = [], []
for line in data:
    d1.append(line[:53].decode()+"\n")
    d2.append(line[56:].decode())


compare = difflib.Differ().compare(d1, d2)

f = open("f.png", "wb")
f1 = open("f1.png", "wb")
f2 = open("f2.png", "wb")

for line in compare:
    bs = bytes([int(o, 16) for o in line[2:].strip().split(" ") if o])
    if line[0] == '+':
        f1.write(bs)
    elif line[0] == '-':
        f2.write(bs)
    else:
        f.write(bs)

f.close()
f1.close()
f2.close()

difflib.Differ().compare(a, b) will generate

  • lines start with +: appear in a not in b
  • lines start with -: appear in b not in a
  • others: appear in both

Result:

  • f.png: ../hex/bin.html
  • f1.png: butter
  • f2.png: fly

Next Level

http://www.pythonchallenge.com/pc/hex/bin.html

  • username: butter
  • password: fly

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