如何在python中解码ascii字符串？

Question

For example, in your python shell(IDLE):

>>> a = "\x3cdiv\x3e"
>>> print a

The result you get is:

<div>

but if a is an ascii encoded string:

>>> a = "\\x3cdiv\\x3e" ## it's the actual \x3cdiv\x3e string if you read it from a file
>>> print a

The result you get is:

\x3cdiv\x3e

Now what i really want from a is <div> , so I did this:

>>> b = a.decode("ascii")
>>> print b

BUT surprisingly I did NOT get the result I want, it's still:

\x3cdiv\x3e

So basically what do I do to convert a , which is \\x3cdiv\\x3e to b , which should be <div> ?

Thanks

Answer 1

>>> a = rb"\x3cdiv\x3e"
>>> a.decode('unicode_escape')
'<div>'

Also check out some interesting codecs .

Answer 2

With python 3.x , you would adapt Kabie answer to

a = b"\x3cdiv\x3e"
a.decode('unicode_escape')

or

a = b"\x3cdiv\x3e"
a.decode('ascii')

both give

>>> a
b'<div>'

What is b prefix for ?

Bytes literals are always prefixed with 'b' or 'B'; they produce an instance of the bytes type instead of the str type. They may only contain ASCII characters; bytes with a numeric value of 128 or greater must be expressed with escapes.