Python-сообщество

>>> s
'\\\\u0410\\\\u043b\\\\u0435\\\\u043a\\\\u0441\\\\u0430\\\\u043d\\\\u0434\\\\u0440'

f = open('example.txt', 'r')
s = f.readline()
s = s.replace('\\\\', '\\')
print s.decode('unicode-escape')

>>> print s.decode('unicode-escape')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python27\lib\encodings\cp437.py", line 12, in encode
    return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode characters in position 6-18: character maps to <undefined>

import codecs
out = codecs.open('example.txt', 'r', 'unicode-escape')
s = out.read()
print s.decode('unicode-escape')

UnicodeEncodeError: 'charmap' codec can't encode characters in position 0-8: character maps to <undefined>
>>> s='\u0410'
>>> print s.decode('unicode-escape')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python27\lib\encodings\cp437.py", line 12, in encode
    return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode character u'\u0410' in position 0: character maps to <undefined>

>>> import sys
>>> print sys.getdefaultencoding()
ascii
>>> s=u'\u0410'
>>> print s
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python27\lib\encodings\cp437.py", line 12, in encode
    return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode character u'\u0410' in position 0: character maps to <undefined>
>>>

sys.stdin.encoding
sys.stdout.encoding