Here is example code:
async def main():
a = 10
async def test():
global a
a +=2
print(a)
await test()
asyncio.run(main())
and the resulting error:
a +=2
^
NameError: name ‘a’ is not defined
4
Because in this example a isn’t a global variable. Its in the local space of the main function. For it to be global a needs to be completely outside everything
Also on another note, adding to global variables concurrently without any form of locking on the variable is a bad idea as it can lead to unexpected results