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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: is python 3 better than python 2?
Date: Wed, 06 Apr 2011 13:01:42 -0400
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:2712

On 4/6/2011 12:31 PM, MRAB wrote:
> On 06/04/2011 07:06, Dan Stromberg wrote:

>> I suspect not all string methods were kept for the bytes type:

Doc says "Bytes and bytearray objects, being =93strings of bytes=94, have=
=20
all methods found on strings, with the exception of encode(), format()=20
and isidentifier(), which do not make sense with these types. " If you=20
find that in error, please file a bug report. You can check with=20
dir(str) and dir(bytes), possibly using set differences. But I believe I =

did that once.

>> >>> 'a/b/c'.split('/')
>> ['a', 'b', 'c']
>> >>> b'a/b/c'.split('/')
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in <module>
>> TypeError: Type str doesn't support the buffer API

Known confusing error message, but notice that you did *not* get
AttributeError: 'bytes' object has no attribute 'split'
which is the error you get for random names. So .split was successfully=20
looked up and then called, and its execution gave the above message.

> You're trying to split bytes with a str (Unicode) argument. Try this:
>
>  >>> b'a/b/c'.split(b'/')
> [b'a', b'b', b'c']

One change in 3.x is the elimination of automatic coercions between=20
bytes and (unicode) strings.
'a/b/c'.split(b'/')
# TypeError: Can't convert 'bytes' object to str implicitly

--=20
Terry Jan Reedy