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In an asynchronous function, what is the role of a Semaphore?
import asyncio
async def request(index, sem):
async with sem:
print(f'Hello from request {index}!')
await asyncio.sleep(3)
async def main():
sem = asyncio.Semaphore(3)
async with asyncio.TaskGroup() as tg:
for index in range(20):
tg.create_task(request(index, sem))
if __name__ == "__main__":
asyncio.run(main())
Author: John PendenqueStatus: Waiting for validationQuestion not yet passed
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7
What is the output of the following code?
```
import asyncio
async def read_data():
with open('data.txt', 'r') as f:
data = f.read()
return data
async def main():
data = await read_data()
print(data)
if __name__ == '__main__':
asyncio.run(main())
```8
Why is the output of the following code undefined?
```
def f(n):
return n + 1
f(n)
```6
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