Python 2 to 3 bytes/string error

Question

I'm trying to convert a Python library made for Python 2 to Python 3, here is the code.

I have an error at line 152. In the Py2 version, the function is:


def write(self, data):
    self._write_buffer += data

The error is:

TypeError: Can't convert 'bytes' object to str implicitly

I found that I've to decode the variable, so I changed the function to:


def write(self, data):
    self._write_buffer += data.decode('utf8')

It works but I have another error in the asyncore library which said that

(the Type) must be bytes or buffer, not str

So, what can I do ?

So what's the problem exactly then?

Ignacio Vazquez-Abrams
– Ignacio Vazquez-Abrams

2010-11-05 08:59:14 +00:00
Commented Nov 5, 2010 at 8:59 — Ignacio Vazquez-Abrams
– Ignacio Vazquez-Abrams, Commented Nov 5, 2010 at 8:59

Ned Batchelder · Accepted Answer · 2010-11-05 09:24:16Z

5

You need to be clear about where you want bytes and where you want strings. If you simply add decode and encode where the errors appear, you will be playing whack-a-mole. In your case, you are writing a socket implementation. Sockets deal with bytes, not strings. So I would think your _write_buffer should be a bytes object, not a string as you now have it.

Line 91 should change to:

self._write_buffer = b''

Then you can work from there to ensure that you use bytes throughout.

answered Nov 5, 2010 at 9:24

Ned Batchelder

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1 Comment

Julien Guigner Over a year ago

Ok, thanks. That was the problem. I still have some errors but I'll try to correct my file to use bytes everywhere its needed.

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