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You still incude python2 symlink which is a mess ...

@Scimmia : Please make a reliable PKGBUILD for community, Python3 is now used by Grass since 7.8 not Python 2 ...

@Scimmia : Why not removing python2 symbolic link, I don't understand your point of view on this point ?

7.8.3 include fix :

replace obsolete time.clock() in Python 3.3 (​PR:244)

@Scimmia : Please remove python2 symlink, tested without and all is fine !

@Marco, thanks modification works. May be could make a patch from it !

As said before in december : https://aur.archlinux.org/packages/grass/?O=10&PP=10#comment-720797 Line 55 in PKGBUILD is stupid : symlink python2 in grass 7.8

Grass calls python2, so I've create a simlink python2 in /opt/grass/bin to /usr/bin/python3. Now it works fine.

For the problem reported by kikislater (AttributeError: module 'time' has no attribute 'clock') I've resolved in this way:

640c640
<         self.resize = time.clock()
---
>         self.resize = time.perf_counter()

as suggested here:

https://stackoverflow.com/questions/58569361/attributeerror-module-time-has-no-attribute-clock-in-python-3-8

[I've deleted my previous message by accident. I apologise for it.]

I have removed all the packages python (pacman -Rc python python2), and I've reinstalled python python2, python-wxpython and grass.

Now grass doesn't find the python module six

GRASS 7.8.2 (WGS84utm): > g.gui wxpython
Launching <wxpython> GUI in the background, please wait...
Traceback (most recent call last):
  File "/opt/grass/gui/wxpython/wxgui.py", line 29, in <module>
    from grass.exceptions import Usage
  File "/opt/grass/etc/python/grass/init.py", line 4, in <module>
    import six
ImportError: No module named six

[marco@Marco ~]$ python
 >>> import six
 >>>

Your python environment is screwed up, it's trying to load python2.

See comments from November.