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Well, before we even decide on that we need to figure all the
issues with addons access, the fact addon update can't
automatically update its list of addons whenever a new one or new
update is added etc.
On 31/01/2021 5:12 pm, Joseph Lee
Hello NVDA add-ons community,
The following should be considered a major
advisory and should be applied as soon as possible (this isn’t
a critical advisory where you need to take immediate action):
A few days ago Reef Turner from NV Access
announced that upcoming NVDA version (2021.1) is targeting
Python 3.8. Based on initial tests with Project Walrus builds
sent out last year, moving NVDA from Python 3.7 to 3.8 is a
bit easier than 2019 when we moved from Python 2 to 3 (NVDA
2019.3; you may recall all sorts of discussions about it
then). However, there are some gotchas you need to be aware
of, and I advise applying changes marked as “required” as soon
as possible in order to minimize disruptions caused by add-on
- Python C extensions (required if
using pyd files): if your add-on uses Python modules with C
extensions (.pyd files), you MUST use C extensions designed
for Python 3.8. If you need to support NVDA 2019.3 and
2020.x alongside 2021.1, you must include both Python 3.7
and 3.8 pyd files because Python 3.8 will not load Python
3.7 C extensions. The most prominent add-on affected is
Resource Monitor (not anymore; see notes).
(required): if you are creating threads through
threading.Thread and wish to check if a thread is alive, you
must now use threading.Thread.is_alive instead of
threading.Thread.isAlive. This affects several add-ons,
including StationPlaylist (see notes).
- Resource Monitor: no action
required – in fact, it is the first add-on to support Python
3.8 and 3.9 (C extensions for 3.7, 3.8, and 3.9 for Psutil
are included with this add-on).
- StationPlaylist: no action
required – mitigations in place since early 2020.
- The above porting notes can
change if NVDA ships with newer dependencies such as
Just like we did with NVDA 2019.3, I advise
add-on authors to publish their add-ons’ readiness for NVDA
2021.1 once 2021.1 beta 1 is released.