[Python] in Python why do I get "name 'a' is not defined" even though I have defined it as...

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

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