Python: run a class method that takes an argument in a new thread

Question

I am trying to do the same thing as in this question: Run Class methods in threads (python), but the class method I want to invoke in a separate thread takes an extra argument, apart from self. A.Rodas's solution does not work: if I try Thread(target=self.class_method, args=(self, arg2)).start(), it says I have 3 arguments instead of 2, while if try args=(arg2), it is breaking my arg2 string into constituent elements and saying 334234 arguments! Any ideas? Thanks

Found the solution! Turns out it wasn't the class method that was causing the error, but the fact that I was sending a tuple of one arg. So I needed to sent args=(arg2,). Note the comma! Got the solution from here: https://stackoverflow.com/questions/37116721/python-typeerror-in-threading-function-takes-x-positional-argument-but-y-were — cbasavaraj, Nov 13 '18 at 21:32

score 0 · Answer 1 · answered Nov 13 '18 at 21:11

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It is hard to tell from the format of your question, but I think the issue is that you shouldn't be including self in the args tuple.

i.e.

threading.Thread(target=self.class_method, args=(arg2)).start()

answered Nov 13 '18 at 21:11

Ian MacDonald

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score 0 · Accepted Answer · edited Jul 30 '19 at 08:52

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You should do it like this:

threading.Thread(target=self.class_method, args=(arg2,)).start()

edited Jul 30 '19 at 08:52

António Almeida

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answered Jul 30 '19 at 08:33

王国春

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Python: run a class method that takes an argument in a new thread

2 Answers2