为了回答您的问题，我将为同一问题提供3种不同的解决方案。
情况1：
import time
def sleep():
print(f'Time: {time.time() - start:.2f}')
time.sleep(1)
def sum(name, numbers):
total = 0
for number in numbers:
print(f'Task {name}: Computing {total}+{number}')
sleep()
total += number
print(f'Task {name}: Sum = {total}\n')
start = time.time()
tasks = [
sum("A", [1, 2]),
sum("B", [1, 2, 3]),
]
end = time.time()
print(f'Time: {end-start:.2f} sec')
输出：
Task A: Computing 0+1
Time: 0.00
Task A: Computing 1+2
Time: 1.00
Task A: Sum = 3
Task B: Computing 0+1
Time: 2.01
Task B: Computing 1+2
Time: 3.01
Task B: Computing 3+3
Time: 4.01
Task B: Sum = 6
Time: 5.02 sec
情况2：
import asyncio
import time
async def sleep():
print(f'Time: {time.time() - start:.2f}')
time.sleep(1)
async def sum(name, numbers):
total = 0
for number in numbers:
print(f'Task {name}: Computing {total}+{number}')
await sleep()
total += number
print(f'Task {name}: Sum = {total}\n')
start = time.time()
loop = asyncio.get_event_loop()
tasks = [
loop.create_task(sum("A", [1, 2])),
loop.create_task(sum("B", [1, 2, 3])),
]
loop.run_until_complete(asyncio.wait(tasks))
loop.close()
end = time.time()
print(f'Time: {end-start:.2f} sec')
输出：
Task A: Computing 0+1
Time: 0.00
Task A: Computing 1+2
Time: 1.00
Task A: Sum = 3
Task B: Computing 0+1
Time: 2.01
Task B: Computing 1+2
Time: 3.01
Task B: Computing 3+3
Time: 4.01
Task B: Sum = 6
Time: 5.01 sec
情况3： （与情况2相同，除了sleep功能不同）
import asyncio
import time
async def sleep():
print(f'Time: {time.time() - start:.2f}')
await asyncio.sleep(1)
async def sum(name, numbers):
total = 0
for number in numbers:
print(f'Task {name}: Computing {total}+{number}')
await sleep()
total += number
print(f'Task {name}: Sum = {total}\n')
start = time.time()
loop = asyncio.get_event_loop()
tasks = [
loop.create_task(sum("A", [1, 2])),
loop.create_task(sum("B", [1, 2, 3])),
]
loop.run_until_complete(asyncio.wait(tasks))
loop.close()
end = time.time()
print(f'Time: {end-start:.2f} sec')
输出：
Task A: Computing 0+1
Time: 0.00
Task B: Computing 0+1
Time: 0.00
Task A: Computing 1+2
Time: 1.00
Task B: Computing 1+2
Time: 1.00
Task A: Sum = 3
Task B: Computing 3+3
Time: 2.00
Task B: Sum = 6
Time: 3.01 sec
case 1与case 2给相同5 seconds，而case 3公正3 seconds。因此，async/await done right速度更快。
差异的原因在于sleep功能的实现内。
# case 1
def sleep():
print(f'Time: {time.time() - start:.2f}')
time.sleep(1)
# case 2
async def sleep():
print(f'Time: {time.time() - start:.2f}')
time.sleep(1)
# case 3
async def sleep():
print(f'Time: {time.time() - start:.2f}')
await asyncio.sleep(1)
sleep在case 1和case 2中是“相同”的。他们“睡觉”而不允许其他人使用资源。而case 3允许在睡眠状态下访问资源。
在case 2我们添加async到正常功能。但是，事件循环将在 运行它。为什么？因为我们没有说允许循环在哪里中断您的函数以运行另一个任务。
在case 3我们告诉事件循环中，确切地中断了该函数的位置以运行另一个任务。到底在哪里？
# case 3
async def sleep():
print(f'Time: {time.time() - start:.2f}')
await asyncio.sleep(1) # <-- Right here!
更多关于此阅读这里
考虑阅读
602392714
清零编程群