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Solve Problems inhttp://www.pythonchallenge.com

1. user:password@domain url
2. --user=${username} --password=${password}

• wgethttp://kohsamui:thailand@www.pythonchallenge.com/pc/rock/warmup.txt
• wget --user=kohsamui --password=thailandwww.pythonchallenge.com/pc/rock/warmup.txt

result :http://www.pythonchallenge.com/pc/rock/arecibo.html

• the picture lead to->http://www.pythonchallenge.com/pc/rock/grandpa.html
• use firefox visit the url get the hint: island:country
• username:kohsamui password:thailand

result:http://www.pythonchallenge.com/pc/ring/grandpa.html

importcsv

• csv lib for handle csv tables, csv for Comma-Separated Values
• 7367 factored result: 53 and 139

result:http://www.pythonchallenge.com/pc/ring/yankeedoodle.html

• do you find these unnecessary empty lines in the source page of guido.html

result:http://www.pythonchallenge.com/pc/ring/guido.html

• use image.split() to split RGB channels
• im.bands() return number of im's channels
• ring means "green" if you visit "green.html" will get response "yes"
• whodunnit is an word means "who is the murderer"

result:http://www.pythonchallenge.com/pc/ring/bell.html auth=(repeat, switch)

• author use python2 keyword, which has some different with python3
• use assert to do assert
• tobytes() method for Image in PIL: Return image as a bytes object.
• getpalette() method for Image in PIL: Returns the image palette as a list.

result:http://www.pythonchallenge.com/pc/hex/speedboat.html

importhashlib

• we get mybroken.zip in level 24
• the decent means leopold mozart
• we have sent an email to leopold mozart in level 19
• fix the broken zip file to match the md5

result:http://www.pythonchallenge.com/pc/hex/decent.html

• lake1.html means there is a file named with lake2
• imagine how they sound

result:http://www.pythonchallenge.com/pc/hex/lake.html

importlogging

• logging helps me to do analyze

importconstant

• I put big size array in my custom constant.py, and i can import it
• the author uses "latin1" Charset

result:http://www.pythonchallenge.com/pc/hex/ambiguity.html

importthis

• rot13
• this is an undocumented module.

result:http://www.pythonchallenge.com/pc/hex/bonus.html

fromPILimportImagefromPILimportImageSequenceimportturtle,time

• use ImageSequence to get the frame number of a gif

a=10b=3print(a/b)# 3.3333333333333335print(a//b)# 2print(a%b)# 1

result:http://www.pythonchallenge.com/pc/hex/copper.html

importzlibimportbz2

• Here is aList of file signatures

result: password is redavni

importrequestsimportzipfile

• requests is a good lib for http request
• request an url with username and password
• breakpoint resume
• you shoule know a http header {"RANGE":"bytes 0-500"}
• revers
• ZIP file Magic number: none or "PK\x03\x04" or "PK\x05\x06"(empty) or "PK\x07\x08"(spanned), PK for Phil Katz
• find points in 2123456789 points

result:http://www.pythonchallenge.com/pc/hex/idiot2.html

importbase64importwave

• use base64 to decode these codes
• use wave to read and write frame
• the sea is yellow the land is blue，which is out of order
• if you email to leopold with “sorry” as subject, you will get a surprise

result:http://www.pythonchallenge.com/pc/hex/bin.htmlusername:butter password:fly

importdifflib

• the obvious different between two picture is brightness.

gunzip deltas.gz

• png file start with: 0x89 0x50 0x4E 0x47 0x0D 0x0A 0x1A 0x0A
• 0x89 is png's magic number,all jpg file start with 0xFF
• 0x50 decode in utf-8 is P, 0x4E for N, 0x47 for G
• use three tag "+", "-", " " to describe the difference between two files

when you say a php file, there are some function in it

• Loop:http://www.pythonchallenge.com/pc/def/linkedlist.php
• RPC:http://www.pythonchallenge.com/pc/phonebook.php

result:http://www.pythonchallenge.com/pc/return/balloons.html

fromhttp.cookiejarimportCookieJarimporturllib.parseimportbz2importrequests

• the small pic in left bottom director us toLevel 3
• use CookieJar to catch cookies
• use bz2 to decompress

is it the 26th already? call his father and inform him that "the flowers are on their way". he'll understand.

• 26th director us toLevel 15
• mozart‘s farther isLeopold Mozart
• call director us tophonebook in Level 12
• Level 12Bert tell us to use the first name
• inform him let us remember that the cookies are {"info":"value"}

result:http://www.pythonchallenge.com/pc/return/romance.html

fromPILimportImage

• this gif is a P mode picture which use one 8 bit number to declare a color
• straight is a way to handle these pixels

result:http://www.pythonchallenge.com/pc/return/mozart.html

fromcalendarimportisleapfromdatetimeimportdate

• year 1756 is a leap year
• 1756-1-27 is Tursday
• mozart's birthday is 1756-1-27
• mozart is the second youngest boy in his family

result:http://www.pythonchallenge.com/pc/return/uzi.html

fromPILimportImagefromPILimportImageDraw

• the key of this problem is to use 100 * 100 = 100 + 99 + 99 + 98 + 98 + 97 + 97 + ...
• the size of cat.png is 100 * 100
• use ImageDraw.point()
• result is "wire/cat.png"

while(    left(0,0) -> right(99,0)  100    up(99,1) -> down(99,99)   99    right(99,98) -> left(99,0) 99    down(98,0) -> up (1,0) 98)

result:http://www.pythonchallenge.com/pc/return/italy.html

importxmlrpc.client

It's amazing that RPC tech has so much long history.

system.listMethods
This method returns a list of the methods the server has, by name.

POST below with application/xml to server.

<?xml version="1.0"?><methodCall>   <methodName>phone</methodName>   <params>      <param>         <value><string>Bert</string></value>         </param>      </params>   </methodCall>

Question12 evil4.jpg tell us the evil is Bert(IE can open evil4.jpg or change the suffix to .txt).

result:http://www.pythonchallenge.com/pc/return/disproportional.html

use python IO to divide the gfx into 5(5 is the count of playing card in the pic) jpg files.

result:http://www.pythonchallenge.com/pc/return/evil.html

fromPILimportImagefromPILimportImageDraw

the hint is in the html'title: odd, even

result:http://www.pythonchallenge.com/pc/return/5808.html

with pycharm IDE, I can debug the code easier.

the method of find rule ofa is:look ata[i - 1], do count
1
the next is one 1: 11
the next is two 1: 21
the next is one 2 one 1: 1211
the next is one 1 one 2 two 2: 111221
the next is three 1 two 2 one 1: 312211

result:http://www.pythonchallenge.com/pc/return/bull.html

the html knowledge learn from 8 help me.

result:http://www.pythonchallenge.com/pc/return/good.html

un:huge pw:file

html knowledge: img-usemap="#--", map, area, sharp, poly, coords.

importbz2

result:http://www.pythonchallenge.com/pc/def/integrity.html

fromPILimportImage

use PIL module to find the block's pixel with getpixel(), then use chr() to translate the code

result:http://www.pythonchallenge.com/pc/def/oxygen.html

importzipfile

zip file not only can bi unzip, can contains a lot of comments.

every level will play with a new lib.

result:http://www.pythonchallenge.com/pc/def/channel.html

importpickle

every line elements add up to 96

result:http://www.pythonchallenge.com/pc/def/peak.html

importrequests

this is a http client lib with to do http request.

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

transfer to:http://www.pythonchallenge.com/pc/def/linkedlist.php

result:http://www.pythonchallenge.com/pc/def/equality.html

result:http://www.pythonchallenge.com/pc/def/ocr.html

• ord()
• chr()
• isalpha()
• isalnum()

True: 'a'.isalpha()True: 'a'.isalnum()

False: '.'.isalpha()False: '.'.isalnum()

True: '1'.isalnum()False: '1'.isalpha()

pow(2,3)

start:http://www.pythonchallenge.com/pc/def/0.html

result:http://www.pythonchallenge.com/pc/def/map.html