Hi,

Continuing work on researching Python 3 transition barriers:

Background:

Python 3.5 introduces async and await keywords for working with asynchronous generators and other possibilities. However, this poses a syntax issue for NVDA: nvwave.playWaveFile has "async" keyword, which, when run with Python 3.7, produces SyntaxError.

Steps to reproduce:

1. Run Python 2.7 and 3.7 interpreters.
2. Run the below code in both interpreters.

Code fragment:

async = True

Actual behavior:

In 2.7, the code works, but in 3.7, SyntaxError is raised.

Expected behavior:

Code should work in 3.7.

System configuration:

NVDA Installed/portable/running from source:

Not applicable

NVDA version:

Not applicable

Windows version:

Windows 10 Version 1803

Name and version of other software in use when reproducing the issue:

Python 2.7, 3.7

Other information about your system:

N/A

Other questions:

Does the issue still occur after restarting your PC?

Yes

Have you tried any other versions of NVDA?

N/A

Possible solution:

One possible solution is to rename the keyword "async" to "_async" or "asynchronous". I would vote for the latter option as it is a bit clear as to what that keyword does.

Impact:

Any module (including add-ons) that calls nvwave.playWaveFile with "async" set to True must now use the proposed keyword argument name, breaking compatibility with old NVDA releases.

Thanks.