bzip2 - using bz2.decompress in python,but the answers different -

i have string this:

un: 'bzh91ay&sya\xaf\x82\r\x00\x00\x01\x01\x80\x02\xc0\x02\x00 \x00!\x9ah3m\x07<]\xc9\x14\xe1ba\x06\xbe\x084' pw: 'bzh91ay&sy\x94$|\x0e\x00\x00\x00\x81\x00\x03$ \x00!\x9ah3m\x13<]\xc9\x14\xe1bbp\x91\xf08' 

and code:

un = re.search(r"un: '(.+)'",page).group(1) bz2.decompress(un) 

then use bz2.decompress method, returns error:

ioerror: invalid data stream 

and try this:

un = 'bzh91...\x084' bz2.decompress(un) 

and returns correct answer.

supplement：this complete code.

#!/usr/bin/env python import urllib import re  import bz2  def main():     page=urllib.urlopen("http://www.pythonchallenge.com/pc/def/integrity.html").read()     unstring = re.search(r"un: *'(.+)'",page).group(1)     print unstring     un = "bzh91ay&sya\xaf\x82\r\x00\x00\x01\x01\x80\x02\xc0\x02\x00 \x00!\x9ah3m\x07<]\xc9\x14\xe1ba\x06\xbe\x084"     #the string un copied output of 'print unstring'     print bz2.decompress (un)     print bz2.decompress (unstring) if (__name__=="__main__"):     main() 

this output:

==== no subprocess ==== >>>  bzh91ay&sya\xaf\x82\r\x00\x00\x01\x01\x80\x02\xc0\x02\x00 \x00!\x9ah3m\x07<]\xc9\x14\xe1ba\x06\xbe\x084 huge traceback (most recent call last):   file "/home/terry/pythonchallage/pythonchallenge_8.py", line 16, in <module>     main()   file "/home/terry/pythonchallage/pythonchallenge_8.py", line 14, in main     print bz2.decompress (unstring) ioerror: invalid data stream >>>  

you have string literals there, each \xhh value 4 literal characters, not byte escape.

if so, you'll first need tell python interpret those:

bz2.decompress(un.decode('string_escape')) 

demo:

>>> unstring = r'bzh91ay&sya\xaf\x82\r\x00\x00\x01\x01\x80\x02\xc0\x02\x00 \x00!\x9ah3m\x07<]\xc9\x14\xe1ba\x06\xbe\x084' >>> print unstring bzh91ay&sya\xaf\x82\r\x00\x00\x01\x01\x80\x02\xc0\x02\x00 \x00!\x9ah3m\x07<]\xc9\x14\xe1ba\x06\xbe\x084 >>> unstring 'bzh91ay&sya\\xaf\\x82\\r\\x00\\x00\\x01\\x01\\x80\\x02\\xc0\\x02\\x00 \\x00!\\x9ah3m\\x07<]\\xc9\\x14\\xe1ba\\x06\\xbe\\x084' >>> import bz2 >>> bz2.decompress(unstring) traceback (most recent call last):   file "<stdin>", line 1, in <module> ioerror: invalid data stream >>> bz2.decompress(unstring.decode('string_escape')) 'huge'