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Updated code example for asyncio.gather 

The previous example did not fully showcase the interest of using gather.

Here the example showcases "the result is an aggregate list of returned values".
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josephernest 2020-06-03 12:52:33 +02:00 committed by GitHub
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19
Doc/library/asyncio-task.rst
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@ -360,32 +360,35 @@ Running Tasks Concurrently
async def factorial(name, number):
f = 1
for i in range(2, number + 1):
print(f"Task {name}: Compute factorial({i})...")
print(f"Task {name}: Compute factorial({number}), currently i={i}...")
await asyncio.sleep(1)
f *= i
print(f"Task {name}: factorial({number}) = {f}")
return f
async def main():
# Schedule three calls *concurrently*:
await asyncio.gather(
L = await asyncio.gather(
factorial("A", 2),
factorial("B", 3),
factorial("C", 4),
)
print(L)
asyncio.run(main())
# Expected output:
#
# Task A: Compute factorial(2)...
# Task B: Compute factorial(2)...
# Task C: Compute factorial(2)...
# Task A: Compute factorial(2), currently i=2...
# Task B: Compute factorial(3), currently i=2...
# Task C: Compute factorial(4), currently i=2...
# Task A: factorial(2) = 2
# Task B: Compute factorial(3)...
# Task C: Compute factorial(3)...
# Task B: Compute factorial(3), currently i=3...
# Task C: Compute factorial(4), currently i=3...
# Task B: factorial(3) = 6
# Task C: Compute factorial(4)...
# Task C: Compute factorial(4), currently i=4...
# Task C: factorial(4) = 24
# [2, 6, 24]
.. versionchanged:: 3.7
If the *gather* itself is cancelled, the cancellation is