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Re: asyncio: What is the difference between tasks, futures, and coroutines?

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On 05/08/2015 02:42 AM, Chris Angelico wrote:
> On Fri, May 8, 2015 at 4:36 PM, Rustom Mody <rustompmody@gmail.com> wrote:
>> On Friday, May 8, 2015 at 10:39:38 AM UTC+5:30, Chris Angelico wrote:
>>> Why have the concept of a procedure?
>>
>> On Friday, Chris Angelico ALSO wrote:
>>> With print(), you have a conceptual procedure...
>>
>> So which do you want to stand by?
>
> A procedure, in Python, is simply a function which returns None.
> That's all. It's not any sort of special concept. It doesn't need to
> be taught. If your students are getting confused by it, stop teaching
> it!

One thing newbies get tripped up by is having some path through their 
code that doesn't explicitly return.  And in Python that path therefore 
returns None.  It's most commonly confusing when there are nested ifs, 
and one of the "inner ifs" doesn't have an else clause.

Anyway, it's marginally more useful to that newbie if the compiler would 
produce an error instead of later seeing a runtime error due to an 
unexpected None result.

I don't think Python would be improved by detecting such a condition and 
reporting on it.  That's a job for a linter, or a style guide program.

No different than the compile time checks for variable type that most 
languages impose.  They don't belong in Python.

-- 
DaveA

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asyncio: What is the difference between tasks, futures, and coroutines? Paul  Moore <p.f.moore@gmail.com> - 2015-05-05 08:22 -0700
  Re: asyncio: What is the difference between tasks, futures, and coroutines? Zachary Ware <zachary.ware+pylist@gmail.com> - 2015-05-05 11:11 -0500
    Re: asyncio: What is the difference between tasks, futures, and coroutines? Paul  Moore <p.f.moore@gmail.com> - 2015-05-05 10:55 -0700
  Re: asyncio: What is the difference between tasks, futures, and coroutines? Terry Reedy <tjreedy@udel.edu> - 2015-05-05 13:15 -0400
  Re: asyncio: What is the difference between tasks, futures, and coroutines? Marko Rauhamaa <marko@pacujo.net> - 2015-05-05 20:45 +0300
    Re: asyncio: What is the difference between tasks, futures, and coroutines? Rustom Mody <rustompmody@gmail.com> - 2015-05-05 21:47 -0700
      Re: asyncio: What is the difference between tasks, futures, and coroutines? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-06 15:48 +1000
        Re: asyncio: What is the difference between tasks, futures, and coroutines? Rustom Mody <rustompmody@gmail.com> - 2015-05-07 21:06 -0700
          Re: asyncio: What is the difference between tasks, futures, and coroutines? Chris Angelico <rosuav@gmail.com> - 2015-05-08 14:33 +1000
            Re: asyncio: What is the difference between tasks, futures, and coroutines? Rustom Mody <rustompmody@gmail.com> - 2015-05-07 21:53 -0700
              Re: asyncio: What is the difference between tasks, futures, and coroutines? Rustom Mody <rustompmody@gmail.com> - 2015-05-07 21:55 -0700
              Re: asyncio: What is the difference between tasks, futures, and coroutines? Chris Angelico <rosuav@gmail.com> - 2015-05-08 15:09 +1000
                Re: asyncio: What is the difference between tasks, futures, and coroutines? Rustom Mody <rustompmody@gmail.com> - 2015-05-07 23:36 -0700
                Re: asyncio: What is the difference between tasks, futures, and coroutines? Chris Angelico <rosuav@gmail.com> - 2015-05-08 16:42 +1000
                Re: asyncio: What is the difference between tasks, futures, and coroutines? Dave Angel <davea@davea.name> - 2015-05-08 07:53 -0400
                Re: asyncio: What is the difference between tasks, futures, and coroutines? Chris Angelico <rosuav@gmail.com> - 2015-05-08 23:02 +1000
      Re: asyncio: What is the difference between tasks, futures, and coroutines? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-05-06 09:11 -0400
        Re: asyncio: What is the difference between tasks, futures, and coroutines? Rustom Mody <rustompmody@gmail.com> - 2015-05-07 21:20 -0700
  Re: asyncio: What is the difference between tasks, futures, and coroutines? Ian Kelly <ian.g.kelly@gmail.com> - 2015-05-05 11:46 -0600
    Re: asyncio: What is the difference between tasks, futures, and coroutines? Paul  Moore <p.f.moore@gmail.com> - 2015-05-05 11:03 -0700
  Re: asyncio: What is the difference between tasks, futures, and coroutines? Skip Montanaro <skip.montanaro@gmail.com> - 2015-05-05 12:55 -0500
  Re: asyncio: What is the difference between tasks, futures, and coroutines? Terry Reedy <tjreedy@udel.edu> - 2015-05-05 18:38 -0400

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