#!/usr/bin/python
import cPickle, struct
l
D={'user': 'password'}
im_dump=cPickle.dumps(D, -1)
length_dump=len(im_dump)

#Пишем в файл
data=str(struct.pack('>i4sh',length_dump,im_dump,8))
pass_file=open('c:\\Python26\\passwd.txt','wb')
pass_file.write(data)
pass_file.close()
print data

#Читаем из файла
pass_file=open('c:\\Python26\\passwd.txt','rb')
test_dump=pass_file.read()
print test_dump
data=str(struct.unpack('>i4sh',test_dump))
D=dict(cPickle.loads(data))
pass_file.close()
print data

Ђ}q
UuserqUpasswordqs.

Traceback (most recent call last):
  File "C:\Python26\mystruct.py", line 21, in <module>
    D=dict(cPickle.loads(data))
UnpicklingError: unpickling stack underflow

In [2]: len(cPickle.dumps({'user': 'password'}, -1))
Out[2]: 27

In [6]: cPickle.dumps({'user': 'password'})
Out[6]: "(dp1\nS'user'\np2\nS'password'\np3\ns."

In [7]: pickled = cPickle.dumps({'user': 'password'})
In [8]: struct.pack('%ds' % len(pickled), pickled)
Out[8]: "(dp1\nS'user'\np2\nS'password'\np3\ns."

import hashlib
D={'user': (hashlib.md5('password').hexdigest())}

#!/usr/bin/env python

## o* - open
## e* - encode
## d* - decode
odata = "username:knkd\x00passwd:superpassword"
edata = odata.encode('bz2').encode('hex')
print edata
  -> '425a6839314159265359f1d03e7c00000fc98040000010260bda80200021a9a68c4da6a100001f8d3e128de762cc5517490dc8a3a4c3e2ee48a70a121e3a07cf80'
ddata = edata.decode('hex').decode('bz2')
repr(ddata)
 -> "'username:knkd\\x00passwd:superpassword'"