python challenge 答案

def fib():
    a = b = 1
    while True:
        yield a
        a,b = b,a+b

In [22]: import string

In [23]: table = string.maketrans( string.ascii_lowercase, string.ascii_lowercase[2:]+string.ascii_lowercase[:2])

In [24]: code = "g fmnc wms bgblr rpylqjyrc gr zw fylb. rfyrq ufyr amknsrcpq ypc dmp. bmgle gr gl zw fylb gq glcddgagclr ylb rfyr'q ufw rfgq rcvr gq qm jmle. sqgle qrpgle.kyicrpylq() gq pcamkkclbcb. lmu ynnjw ml rfc spj"

In [25]: code.translate(table)
Out[25]: "i hope you didnt translate it by hand. thats what computers are for. doing it in by hand is inefficient and that's why this text is so long. using string.maketrans() is recommended. now apply on the url"

In [26]: "map".translate(table)
Out[26]: 'ocr'

char_count = {}
for line in open("level2code.txt"):
    for c in line:
        char_count.setdefault(c, 0)
        char_count[c] += 1

sorted_chars = sorted(char_count.items(), key=lambda x: x[1])
print sorted_chars

[('a', 1), ('e', 1), ('i', 1), ('l', 1), ('q', 1), ('u', 1), ('t', 1), ('y', 1), ('\n', 1220), ('^', 6030), ('*', 6034), ('&', 6043), ('$', 6046), ('{', 6046), ('+', 6066), ('!', 6079), ('%', 6104), ('}', 6105), ('[', 6108), ('_', 6112), ('#', 6115), (']', 6152), ('(', 6154), ('@', 6157), (')', 6186)]

chars = ['a', 'e', 'i', 'l', 'q', 'u', 't', 'y']
all_str = "".join(open("level2code.txt"))
chars_ind = [(c, all_str.find(c)) for c in chars]
print ''.join([c[0] for c in sorted(chars_ind, key=lambda x: x[1])])

import re
all_str = "".join(open("level3code.txt"))
chars = re.findall(r'[^A-Z][A-Z]{3}([a-z])[A-Z]{3}[^A-Z]', all_str)
print "".join(chars)

import re
import urllib

next = "8022"
url = ""
response = ""
while next:
    url = "http://www.pythonchallenge.com/pc/def/linkedlist.php?nothing="+next
    res = urllib.urlopen(url)
    response = res.read()

    # handle the solution (last) line
    if re.findall(r'\.html$', response):
        break

    code = re.findall(r'\d+$', response)

    if(code):
        next = code[0]
    else:
        # handle the divide by two line
        next = str (int (next) / 2 )

    print url
    print response

>>> import pickle
>>> banner = pickle.load(open("banner.p", 'r'))
>>> banner
[[(' ', 95)], [(' ', 14), ... (omitted)
>>> len(banner)
23

for linelist in banner:
    print "".join(ch * count for ch, count in linelist)

import zipfile, re
findnothing = re.compile(r"Next nothing is (\d+)").match
comments = []
z = zipfile.ZipFile("channel.zip", "r")
seed = "90052"
while True:
    fname = seed + ".txt"
    comments.append(z.getinfo(fname).comment)
    guts = z.read(fname)
    m = findnothing(guts)
    if m:
        seed = m.group(1)
    else:
        break
print "".join(comments)

import Image

im = Image.open("../images/oxygen.png")
print "Image info:",im.format, im.size, im.mode

height = 0
for h in range(im.size[1]):
    pixel = im.getpixel((0, h))
    if(pixel[0]==pixel[1] and pixel[1]==pixel[2]):
        height = h
        break

ascii = [-1]
for w in range(0, im.size[0], 7):
    pixel = im.getpixel((w, height))
    if(pixel[0]==pixel[1] and pixel[1]==pixel[2]):
        ascii.append(pixel[0])
    else:
        break

ascii.remove(-1)
print "".join([chr(asc) for asc in ascii])

import Image,ImageDraw
im = Image.new('RGB', (500,500))
draw = ImageDraw.Draw(im)
first=[146,399,163,403, ...]  # chunked
second=[156,141,165,135, ...] # chunked
draw.polygon(first,fill='white')
draw.polygon(second,fill='white')
im.save('09.jpg')

def readNum(num_seq):
    next_num = ""
    index = 0
    cur = num_seq[index]
    index += 1
    while index < len(num_seq):
        while index < len(num_seq) and num_seq[index] == cur[0]:
            cur += num_seq[index]
            index += 1
        else:
            if index < len(num_seq):
                next_num += str(len(cur))+cur[0]
                cur = num_seq[index]
                index += 1
    else:
        next_num += str(len(cur))+cur[0]

    return next_num

a = ['1']
for i in range(30):
    a.append(readNum(a[i]))

print len(a[30])

import Image
src = Image.open("cave.jpg")
w,h = src.size[0], src.size[1]
print "Image info:",src.format, src.size, src.mode
new = Image.new(src.mode,(w/2, h))

for i in range(w*h):
    y, x = divmod(i, w)
    p = src.getpixel((x,y))
    if i%2:
        new.putpixel((x/2,y/2+h/2),p)
    else:
        new.putpixel((x/2,y/2),p)
new.save('11.jpg')

#! /usr/bin/env python
'''python challenge level 12
question url: http://www.pythonchallenge.com/pc/return/evil.html
answer url: http://www.pythonchallenge.com/pcc/return/.html
'''

f = open('evil2.gfx','rb')
content = f.read()
f.close()

for i in xrange(5):
    f = open('level12_%d.jpg' % i, 'wb')
    f.write(content[i::5])
    f.close()