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- Subject: Re: Why adding an extra parentheses can let function return only one return value?
- From: Coda Highland <chighland@...>
- Date: Wed, 15 Jul 2015 19:40:01 -0700
On Wed, Jul 15, 2015 at 7:37 PM, Nan Xiao <firstname.lastname@example.org> wrote:
> Hi all,
> After reading pil, I know adding an extra parentheses can let function
> return only one return value:
> function f()
> return 1, 2
> print(f()) --> 1, 2
> print((f())) --> 1
> But the pil doesn't tell the reason behind it.
> Could anyone explain it? Thanks very much in advance!
> Best Regards
> Nan Xiao
It's pretty simple: (f()) is an expression, not a function call
(though it of course CONTAINS a function call), and expressions always
return a single value. You could also say f() + 0.