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Re: Lists

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To python-list@python.org
From Peter Otten <__peter__@web.de>
Subject Re: Lists
Date Mon, 15 Sep 2014 09:36:46 +0200
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Christian Gollwitzer wrote:

> Am 15.09.14 04:40, schrieb Seymore4Head:
>> nums=range(1,11)
>> print (nums)
> 
>> I don't understand why the command nums=range(1,11) doesn't work.
>> I would think that print(nums) should be 1,2,3 ect.
>> Instead it prints range(1,11)
> 
> It does work, but in a different way than you might think. range() does
> not return a list of numbers, but rather a generator - that is an object
> which produces the values one after another. But you can transform it
> into a list:
> 
> print(list(nums))
> 
> should give you what you want.
> 
> Christian

I'd call range() an iterable. A generator is a specific kind of iterator.
The difference between iterable and iterator is that the latter cannot be 
restarted:

>>> def f():
...     yield 1
...     yield 2
... 
>>> g = f()
>>> list(g)
[1, 2]
>>> list(g)
[] # empty --> g is an iterator
>>> r = range(1, 3)
>>> list(r)
[1, 2]
>>> list(r)
[1, 2] # same as before --> r is an iterable

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Thread

Lists Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-09-14 22:40 -0400
  Re: Lists Christian Gollwitzer <auriocus@gmx.de> - 2014-09-15 08:04 +0200
    Re: Lists Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-15 17:09 +1000
    Re: Lists Peter Otten <__peter__@web.de> - 2014-09-15 09:36 +0200
    Re: Lists Ian Kelly <ian.g.kelly@gmail.com> - 2014-09-15 09:53 -0600
    Re: Lists Peter Otten <__peter__@web.de> - 2014-09-15 18:16 +0200
  Re: Lists Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-15 16:59 +1000
    Re: Lists Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-09-15 11:27 -0400
  Re:Lists Dave Angel <davea@davea.name> - 2014-09-15 09:05 -0400
    Re: Lists Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-09-15 11:28 -0400

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