Global inline flags have been deprecated since python 3.6.
In python 3.11 they are treated as an error, thus preventing nengo-guy from successfully loading.

Steps to reproduce the behavior:
Install python 3.11 and run nengo-gui (either try to import nengo-gui as a python module or type nengo in the system's shell)

Screenshots

Versions

• Nengo GUI version 0.4.9

Additional context
see here for more detail:
python/cpython#91222

dabeaz/ply#274

copy of the python interpreter's error message:
Traceback (most recent call last):
File "/home/lorenzopirovano/.local/bin/nengo", line 5, in
from nengo_gui import main
File "/home/lorenzopirovano/.local/lib/python3.11/site-packages/nengo_gui/init.py", line 1, in
from .gui import GUI, InteractiveGUI
File "/home/lorenzopirovano/.local/lib/python3.11/site-packages/nengo_gui/gui.py", line 21, in
from nengo_gui.guibackend import GuiServer
File "/home/lorenzopirovano/.local/lib/python3.11/site-packages/nengo_gui/guibackend.py", line 25, in
import nengo_gui.page
File "/home/lorenzopirovano/.local/lib/python3.11/site-packages/nengo_gui/page.py", line 14, in
import nengo_gui.config
File "/home/lorenzopirovano/.local/lib/python3.11/site-packages/nengo_gui/config.py", line 4, in
import nengo_gui.components
File "/home/lorenzopirovano/.local/lib/python3.11/site-packages/nengo_gui/components/init.py", line 10, in
from .sim_control import SimControl
File "/home/lorenzopirovano/.local/lib/python3.11/site-packages/nengo_gui/components/sim_control.py", line 10, in
from nengo_gui.server import WebSocketFrame
File "/home/lorenzopirovano/.local/lib/python3.11/site-packages/nengo_gui/server.py", line 31, in
from nengo_gui._vendor.cookies import Cookies
File "/home/lorenzopirovano/.local/lib/python3.11/site-packages/nengo_gui/_vendor/cookies.py", line 111, in
class Definitions(object):
File "/home/lorenzopirovano/.local/lib/python3.11/site-packages/nengo_gui/_vendor/cookies.py", line 313, in Definitions
ATTR_RE = re.compile(ATTR)
^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/re/init.py", line 227, in compile
return _compile(pattern, flags)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/re/init.py", line 294, in _compile
p = _compiler.compile(pattern, flags)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/re/_compiler.py", line 743, in compile
p = _parser.parse(p, flags)
^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/re/_parser.py", line 980, in parse
p = _parse_sub(source, state, flags & SRE_FLAG_VERBOSE, 0)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/re/_parser.py", line 455, in _parse_sub
itemsappend(_parse(source, state, verbose, nested + 1,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/re/_parser.py", line 863, in _parse
p = _parse_sub(source, state, sub_verbose, nested + 1)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/re/_parser.py", line 455, in _parse_sub
itemsappend(_parse(source, state, verbose, nested + 1,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/re/_parser.py", line 863, in _parse
p = _parse_sub(source, state, sub_verbose, nested + 1)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/re/_parser.py", line 455, in _parse_sub
itemsappend(_parse(source, state, verbose, nested + 1,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/re/_parser.py", line 841, in _parse
raise source.error('global flags not at the start '
re.error: global flags not at the start of the expression at position 399 (line 7, column 33)