How can an int be '+' with a tuple?

[Jach Fong]

Forgive my ignorance of "*any" notation. I don't have real experience of
using it in my codes so far, and didn't know those parameters were
packed as a tuple:-(


Steven D'Aprano 於 2018/6/3 下午 01:08 寫道:
> 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)
> 
> 
> 

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