多处理错误“AttributeError:无法在<模块'__main__"上获取属性'testfuncxx' [英] multiprocessing error "AttributeError: Can't get attribute 'testfuncxx' on <module '__main__"
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问题描述
#!/usr/bin/env python3.5
import multiprocessing, time
def testfuncxx(num):
time.sleep(num)
print(num
pool = multiprocessing.Pool(processes=3)
)
for i in range(10):
#testfuncxx(i)
#print(i, '=======')
pool.apply_async(testfuncxx, args=(i,))
pool.close()
pool.join()
推荐答案
由于我只能在 Windows 上进行测试,因此当我将代码包含在 if __name__ == '__main__'
条目中时,该代码有效-点保护.更多详情此处.通常,建议在多处理指南中包含此保护.
Since I can only test on Windows, the code works when I enclose the code in a if __name__ == '__main__'
entry-point protection. More details here. In general, including this protection is recommended in the multiprocessing guidelines.
注意:代码作为脚本test.py运行.要在 IPython 或 Jupyter notebook 中运行代码,您可以像 import test
一样导入它.
Note: The code was run as a script test.py. To run the code in IPython or Jupyter notebook, you may import it like import test
.
test.py:
import multiprocessing, time
def testfuncxx(num):
time.sleep(num)
print(num)
def apply_async_callback():
pool = multiprocessing.Pool(processes=3)
for i in range(10):
pool.apply_async(testfuncxx, args=(i,))
pool.close()
pool.join()
if __name__=='__main__':
apply_async_callback()
#Output:
0
1
2
3
4
5
6
7
8
9
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