Python Challenge level 19

http://www.pythonchallenge.com/pc/hex/bin.html (login:butter/fly)

- A map of India. An email with an attachment (wav file). Very straightforward, we should convert the mess in the attachment into a voice file.

import base64, wave
f = open("mess.txt")
mess = f.read()
f.close()

f = open('voice.wav', 'wb')
f.write(base64.decodestring(mess))
f.close()

- Unfortunately, the output file just says "sorry".
- There are other tips, like "===============1295515792==", "Maybe my computer is out of order", "please", and so on... but still have no idea.
- Trying to google, someone said I should swap the bytes in each frame in the wav file!
- See also: https://docs.python.org/2/library/wave.html

voice = wave.open("voice.wav", "r")
voice_frames = voice.readframes(voice.getnframes())

voice_new_frames = ""
even = ""
odd = ""

for i in range(len(voice_frames)):
 if i%2 == 0:
  odd = str(voice_frames[i])
 elif i%2 == 1:
  even = str(voice_frames[i])
  voice_new_frames += even
  voice_new_frames += odd
  
voice_new = wave.open('voice_new.wav', 'w')
voice_new.setnchannels(1)
voice_new.setframerate(voice.getframerate())
voice_new.setnframes(voice.getnframes())
voice_new.setsampwidth(voice.getsampwidth())

voice_new.writeframes(voice_new_frames)
voice_new.close()

- The output file was singing "You are an idiot ah ah ah ah ah ah ...." ... - The answer is "idiot", and click the link to the get to the next level!