New submission from 张德岳 <abcdyzh...@163.com>:

I found a bug in wave.py because there is no check for self._channel in 
_read_fmt_chunk function.
When I try to open a wav file which channel is zero, it will crash bacause of 
divided by zero in initfp function.

----------
components: Library (Lib)
files: audio-testcase.wav
messages: 306420
nosy: BT123
priority: normal
pull_requests: 4381
severity: normal
status: open
title: bug in Lib/wave.py
type: crash
versions: Python 3.6
Added file: https://bugs.python.org/file47270/audio-testcase.wav

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32056>
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