"Tor Erik Sønvisen" <[EMAIL PROTECTED]> wrote:
> How can I transform b so that the assertion holds? I.e., how can I
> reverse the backslash-replaced encoding, while retaining the str-type?
>
>>>> a = u''
>>>> b = a.encode('ascii', 'backslashreplace')
>>>> b
> '\\xe6'
>>>> assert isinstance(b, str) and b == ''
>
> Traceback (most recent call last):
> File "<pyshell#59>", line 1, in <module>
> assert isinstance(b, str) and b == ''
> AssertionError
>
The simple answer is that you cannot: the backslashreplace isn't a
reversible operation. e.g. Try:
>>> a = u'\\xe6æ'
>>> print a
\xe6æ
>>> b = a.encode('ascii', 'backslashreplace')
>>> b
'\\xe6\\xe6'
>>>
There is no way after the encoding that you can tell which of the \xe6
sequences needs reversing and which doesn't. Perhaps the following is
what you want:
>>> b = a.encode('unicode_escape')
>>> print b
\\xe6\xe6
>>> print b.decode('unicode_escape')
\xe6æ
>>>
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