if __name__ == "__main__": not working.

[jpj73ak]

I was trying out the authentication example. I noticed the program did not have if __name__ == "__main__":

but rather just

ui.run()

If I change it to

if __name__ == "__main__":
    ui.run()

It breaks. Could someone explain why?

PS C:\Users\jason\Documents\JPJ-Dev\nicegui> python.exe testing.py
ERROR:    Traceback (most recent call last):
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\starlette\routing.py", line 671, in lifespan
    async with self.lifespan_context(app):
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\starlette\routing.py", line 566, in __aenter__
    await self._router.startup()
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\starlette\routing.py", line 650, in startup
    handler()
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\nicegui\nicegui.py", line 59, in handle_startup
    print(f'NiceGUI ready to go on http://{globals.host}:{globals.port}')
AttributeError: module 'nicegui.globals' has no attribute 'host'

ERROR:    Application startup failed. Exiting.
Task raised an exception
Traceback (most recent call last):
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\nicegui\background_tasks.py", line 57, in _handle_task_result
    task.result()
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\nicegui\binding.py", line 27, in loop
    await asyncio.sleep(globals.binding_refresh_interval)
AttributeError: module 'nicegui.globals' has no attribute 'binding_refresh_interval'

[falkoschindler]

This has been discussed here #181 and here #252.

A workaround is to use

if __name__ in {"__main__", "__mp_main__"}:

or simply no main guard at all as in the examples.

Besides that we are still looking for a solution to either support a regular main guard or at least to improve the error message.