在 Python 中线程化时出现 AssertionError
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AssertionError when threading in Python
提问by djcmm476
I'm trying to run some simple threading in Python using:
我正在尝试使用以下方法在 Python 中运行一些简单的线程：
t1 = threading.Thread(analysis("samplequery"))
t1.start()
other code runs in here
t1.join()
Unforunately I'm getting the error:
不幸的是，我收到错误消息：
"AssertionError: group argument must be none for now"
“断言错误：组参数现在必须为无”
I've never implemented threading in Python before, so I'm a bit unsure as to what's going wrong. Does anyone have any idea what the problem is?
我以前从未在 Python 中实现过线程，所以我有点不确定出了什么问题。有谁知道问题是什么？
I'm not sure if it's relevant at all, but analysis is a method imported from another file.
我不确定它是否相关，但分析是一种从另一个文件导入的方法。
I had one follow up query as well. Analysis returns a dictionary, how would I go about assigning that for use in the original method?
我也有一个后续查询。分析返回一个字典，我将如何分配它以用于原始方法？
Thanks
谢谢
采纳答案by Martijn Pieters
You want to specify the targetkeyword parameter instead:
您想改为指定target关键字参数：
t1 = threading.Thread(target=analysis("samplequery"))
You probably meant to make analysisthe run target, but 'samplequerythe argument when started:
您可能打算制作analysis运行目标，但启动时'samplequery的参数：
t1 = threading.Thread(target=analysis, args=("samplequery",))
The first parameter to Thread()is the groupargument, and it currently only accepts Noneas the argument.
to 的第一个参数Thread()是group参数，它目前只接受None作为参数。
From the threading.Thread()documentation:
This constructor should always be called with keyword arguments. Arguments are:
- groupshould be
None; reserved for future extension when aThreadGroupclass is implemented.- targetis the callable object to be invoked by the
run()method. Defaults toNone, meaning nothing is called.
应始终使用关键字参数调用此构造函数。参数是：
- 组应该是
None；为将来ThreadGroup实现类时的扩展保留。- target是
run()方法要调用的可调用对象。默认为None，意味着什么都不调用。
回答by g.d.d.c
You need to provide the targetattribute:
您需要提供target属性：
t1 = threading.Thread(target = analysis, args = ('samplequery',))
