Certain inputs to wave.open() result in readframes returning a str instead of bytes

[ChristopheBiocca]

BPO	24608
Nosy	@serhiy-storchaka
Files	python_wave_error.py: Simple script showing the issue.

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2015-07-10.19:28:43.522>
created_at = <Date 2015-07-10.18:37:45.246>
labels = ['type-bug', 'library']
title = 'Certain inputs to wave.open() result in readframes returning a str instead of bytes'
updated_at = <Date 2015-07-10.19:28:43.521>
user = 'https://bugs.python.org/ChristopheBiocca'

bugs.python.org fields:

activity = <Date 2015-07-10.19:28:43.521>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2015-07-10.19:28:43.522>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2015-07-10.18:37:45.246>
creator = 'Christophe Biocca'
dependencies = []
files = ['39891']
hgrepos = []
issue_num = 24608
keywords = []
message_count = 3.0
messages = ['246575', '246578', '246579']
nosy_count = 3.0
nosy_names = ['python-dev', 'serhiy.storchaka', 'Christophe Biocca']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue24608'
versions = ['Python 3.4', 'Python 3.5', 'Python 3.6']

[ChristopheBiocca]

Basically, some (malformed or empty?) WAV strings result in the empty string being returned when calling readframes.

That string cannot be passed back to writeframes() without causing a crash, since it does not implement the buffer interface.

[python-dev]

New changeset 9e035639516c by Serhiy Storchaka in branch '3.4':
Issue bpo-24608: chunk.Chunk.read() now always returns bytes, not str.
https://hg.python.org/cpython/rev/9e035639516c

New changeset 64b2d154a5db by Serhiy Storchaka in branch '3.5':
Issue bpo-24608: chunk.Chunk.read() now always returns bytes, not str.
https://hg.python.org/cpython/rev/64b2d154a5db

New changeset 8befb15024b5 by Serhiy Storchaka in branch 'default':
Issue bpo-24608: chunk.Chunk.read() now always returns bytes, not str.
https://hg.python.org/cpython/rev/8befb15024b5

[serhiy-storchaka]

Thank you for your report Christophe.