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[英]Memory usage with concurrent.futures.ThreadPoolExecutor in Python3
[英]ThreadPoolExecutor is not defined [python3]
我正在尝试运行以下代码,这些代码是直接从文档中复制的: https : //docs.python.org/dev/library/concurrent.futures.html#module-concurrent.futures :
import executor
import concurrent.futures
import time
def wait_on_b():
time.sleep(5)
print(b.result()) # b will never complete because it is waiting on a.
return 5
def wait_on_a():
time.sleep(5)
print(a.result()) # a will never complete because it is waiting on b.
return 6
executor = ThreadPoolExecutor(max_workers=2)
a = executor.submit(wait_on_b)
b = executor.submit(wait_on_a)
我得到以下输出:
Traceback (most recent call last):
File "test1.py", line 16, in <module>
executor = ThreadPoolExecutor(max_workers=2)
NameError: name 'ThreadPoolExecutor' is not defined
我以为我忘了导入一些东西,但是我不知道。
可以使用executor = concurrent.futures.ThreadPoolExecutor(maxworkers=2)
from concurrent.futures import ThreadPoolExecutor
而不是executor = concurrent.futures.ThreadPoolExecutor(maxworkers=2)
进行import concurrent.futures
,也可以直接使用from concurrent.futures import ThreadPoolExecutor
并使用executor = concurrent.futures.ThreadPoolExecutor(maxworkers=2)
。
还要注意,您复制的示例代码旨在死锁,因此一旦解决了导入问题,它将无法正常工作。
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