How can an int be '+' with a tuple?
Steven D'Aprano
steve+comp.lang.python at pearwood.info
Sun Jun 3 01:08:08 EDT 2018
On Sun, 03 Jun 2018 04:59:34 +0000, Steven D'Aprano wrote:
> On Sun, 03 Jun 2018 10:55:04 +0800, Jach Fong wrote:
>
>> The attached is a script which can run under Python 3.4/Windows Vista
>> correctly. One thing make me puzzled is that the "any + context" at
>> line 18. The "any" was passed as an integer from line 43 and the
>> "context" was defined as a tuple at line 35. This concatenation works!
>> how?
>
> 90% of the script you attached is irrelevant to your question. None of
> the tkinter or threading code is important. The only important parts
> are:
>
> def threaded(action, args, context, onExit, onProgress):
> def progress(*any):
> threadQueue.put((onProgress, any + context))
>
> Here we can tell that ``any`` is a tuple.
Oops, I misread your question. You thought any was an int. But the *
(star) notation in function parameters makes the parameter collect any
unnamed arguments into a single tuple.
def test(first, *args):
print(args)
test(1, 2, 3, "hello", 99)
=> prints the tuple (2, 3, "hello", 99)
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
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