[Python-3000] bytearray incompatible with bytes

[Guido van Rossum]

2008/8/29 Pyry Pakkanen <pyry.pakkanen at gmail.com>:
> Hello list! First post.

Welcome!

> I ran in to this problem with ossaudiodev module when trying to copy
> the input audio to output:
>
> import ossaudiodev
> dev = ossaudiodev.open("rw")
> dev.setparameters(ossaudiodev.AFMT_S16_NE,2,44100)
> for i in range(1000): #Copy audio from input to output for a few seconds
>    dev.write(dev.read(1024))
>
> It runs fine in 2.5 but in 3.0b3 it gives the following exception:
> Traceback (most recent call last):
>  File "myscripts/ossthrough.py", line 5, in <module>
>    dev.write(dev.read(1024))
> TypeError: write() argument 1 must be bytes or read-only buffer, not bytearray
>
> This looks like a bug. I thought bytearray is a read-only buffer.
>
> Looking at the ossaudiodev.c source it seems that
> PyArg_ParseTuple(args, "y#:write", &cp, &size) doesn't accept
> bytearrays.

There are two separate bugs here: it's true that dev.write() should
accept a bytearray instance, but dev.read() should have returned
bytes.

And yes, Aahz is right, please take a minute to register with
bugs.python.org and file a bug.

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)