f

#### The reverse of encode('...', 'backslashreplace')

Hi,

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 =3D u'=E6'
>>> b =3D a.encode('ascii', 'backslashreplace')
>>> b
'\\xe6'
>>> assert isinstance(b, str) and b =3D=3D '=E6'

Traceback (most recent call last):
File "<pyshell#59>", line 1, in <module>
assert isinstance(b, str) and b =3D=3D '=E6'
AssertionError

Regards,
tores

 0
torerik81 (18)
9/3/2007 7:32:04 PM
comp.lang.python 77058 articles. 6 followers.

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"Tor Erik S�nvisen" <torerik81@gmail.com> 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'\\xe6�'
>>> print a
\xe6�
>>> 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')
\xe6�
>>>

 0
duncan.booth (1734)
9/4/2007 7:27:54 AM

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