TypeError: unsupported operand type(s) for |: 'sip.wrappertype' and 'type'

[geraldo]

On QGIS 3.28.6 with Python 3.9.5 on Windows 10 the following error happens on installing the plugin:

TypeError: unsupported operand type(s) for |: 'sip.wrappertype' and 'type'
Traceback (most recent call last):
File "C:\OSGeo4W/apps/qgis-ltr/./python\qgis\utils.py", line 423, in startPlugin
plugins[packageName] = package.classFactory(iface)
File "C:\Users/havargas/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\a00_qpip_init.py", line 2, in classFactory
from .plugin import Plugin
File "C:\OSGeo4W/apps/qgis-ltr/./python\qgis\utils.py", line 888, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
File "C:\Users/havargas/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\a00_qpip\plugin.py", line 20, in
class Plugin:
File "C:\Users/havargas/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\a00_qpip\plugin.py", line 134, in Plugin
def check_deps(self, additional_plugins=[]) -> MainDialog | bool:
TypeError: unsupported operand type(s) for |: 'sip.wrappertype' and 'type'

[m-kuhn]

Are you able to validate if Union works for you?

from typing import Union

...

def check_deps(self, additional_plugins=[]) -> Union[MainDialog, bool]:

[geraldo]

I´m not familiar with Union, but it seems to work on that machine. At least the following code runs without error and prints out x:

from typing import Union

def f(x: str) -> Union[str, None]:
    if x:
        return "x"

print(f("ok"))

[jmkerloch]

I confirm this is fixing the issue on 3.28.1 with python 3.9.5 on Windows

[jmkerloch]

I created a PR for the fix #28

[Danaozhong]

I got the same problem with the latest release and QGIS 3.34, any chance you could do a new release soon?