[英]multiprocessing.dummy in Python is not utilising 100% cpu
[英]multiprocessing.dummy why AttributeError: 'module' object has no attribute 'dummy'
我在Python中遇到了一件奇怪的事情:
>>> import multiprocessing
>>> thread_pool = multiprocessing.dummy.Pool()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'dummy'
但是,當我嘗試以下操作時:
>>> from multiprocessing.dummy import Pool as ThreadPool
>>> ThreadPool()
<multiprocessing.pool.ThreadPool object at 0x7faf9308d4a8>
和
>>> import multiprocessing.dummy
>>> multiprocessing.dummy.Pool()
<multiprocessing.pool.ThreadPool object at 0x7faf9308d2e8>
一切都好。 我知道import xxx
和from xxx import
之間的區別,我想知道為什么會引發AttributeError。 我的問題是為什么import multiprocessing
multiprocessing.dummy
后不能使用import multiprocessing
?
multiprocessing.dummy
包未導入multiprocessing.__init__.py
。 因此,
>>> import multiprocessing
>>> thread_pool = multiprocessing.dummy.Pool()
不起作用。 形成文檔字符串:
# This package is intended to duplicate the functionality (and much of
# the API) of threading.py but uses processes instead of threads. A
# subpackage 'multiprocessing.dummy' has the same API but is a simple
# wrapper for 'threading'.
我猜想該子軟件包已被故意隱藏起來,以防止人們意外使用它。
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