On Saturday, July 1, 2017 at 12:48:39 AM UTC-5, Christian Gollwitzer wrote:
> Am 30.06.17 um 04:33 schrieb Rick Johnson:
> > And to further drive home the point, you can manually
> > insert a list literal to prove this:
> >
> > >>> range(10)
> > [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
> > >>
On Thursday, June 29, 2017 at 9:58:23 PM UTC-5, Chris Angelico wrote:
> On Fri, Jun 30, 2017 at 12:33 PM, Rick Johnson
> > A better *FIRST* example would be something like this:
> >
> > def add(x, y):
> > return x + y
> >
> > When teaching a student about functions, the first step is
>
Am 30.06.17 um 04:33 schrieb Rick Johnson:
And to further drive home the point, you can manually insert
a list literal to prove this:
>>> range(10)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> for value in [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]:
... print(value)
...
0
1
No
On Sat, Jul 1, 2017 at 1:25 PM, MRAB wrote:
> On 2017-07-01 03:12, Stefan Ram wrote:
>>
>> Terry Reedy writes:
>>>
>>> range is a class, not a function in the strict sense.
>>
>>
>>»the built-in function range() returns an iterator of integers«
>>
>> The Python Language Reference, Re
On 2017-07-01 03:12, Stefan Ram wrote:
Terry Reedy writes:
range is a class, not a function in the strict sense.
»the built-in function range() returns an iterator of integers«
The Python Language Reference, Release 3.6.0, 8.3 The for statement
Python 3.6.1 (v3.6.1:69c0db5, Mar
On 6/30/2017 1:07 PM, Irv Kalb wrote:
Thanks to everyone who responded to my question about teaching the range
function.
range is a class, not a function in the strict sense.
Classes represent concepts. Instances of classes represent instances of
the concept. Range represent the concept 'a
> On Jun 29, 2017, at 2:21 PM, Chris Angelico wrote:
>
> On Fri, Jun 30, 2017 at 6:57 AM, Irv Kalb wrote:
>> I am wondering if other teachers have run into this. Is this a real
>> problem? If so, is there any other way of explaining the concept without
>> getting into the underlying details
On Sat, Jul 1, 2017 at 2:17 AM, Stefan Ram wrote:
> However, to my defense, I must say that in this post my intend
> was to demonstrate what is happening /behind the curtains/ when
> the »for« loop is running, so in this special case, it might be
> appropriate to use a function that otherw
On Fri, 30 Jun 2017 09:17 am, Stefan Ram wrote:
b = a.__iter__()
Don't do that.
Dunder ("Double UNDERscore") methods like __iter__ should only be called by the
Python interpreter, not by the programmer. The right way to create an iterator
is to call the built-in function iter:
b = iter(a)
Hello Irv, and welcome! Good to have a teacher of Python here!
On Fri, 30 Jun 2017 06:57 am, Irv Kalb wrote:
[...]
> Now I am looking at the change in the range function. I completely understand
> the differences between, and the reasons for, how range works differently in
> Python 2 vs Python
Gregory Ewing wrote:
> Don't start with range(). Start with lists, and introduce the for
> loop as a way to iterate over lists. Leave range() until much later.
> You should be able to go a *long* way without it -- it's quite
> rare to need to iterate over a range of ints in idiomatic Python
> code
On Friday, June 30, 2017 at 8:28:23 AM UTC+5:30, Chris Angelico wrote:
> On Fri, Jun 30, 2017 at 12:33 PM, Rick Johnson wrote:
> > A better *FIRST* example would be
> > something like this:
> >
> > def add(x, y):
> > return x + y
> >
> > When teaching a student about functions, the firs
On Fri, Jun 30, 2017 at 12:33 PM, Rick Johnson
wrote:
> A better *FIRST* example would be
> something like this:
>
> def add(x, y):
> return x + y
>
> When teaching a student about functions, the first step is
> to help them understand *WHY* they need to use functions,
> and the second
On Thursday, June 29, 2017 at 4:01:07 PM UTC-5, Irv Kalb wrote:
>
> [...]
>
> But Python 3's version of the range function has been
> turned into a generator. Again, I understand why this
> happened, and I agree that this is a good change. The
> problem is, how can I explain this concept to stude
Irv Kalb wrote:
In Python 2, I easily
demonstrated the range function using a simple print statement:
print range(0, 10)
I discussed how range returns a list. I gave many examples of different
values being passed into range, and printing the resulting lists.
Next, I introduced the concept of
On 29Jun2017 13:57, Irv Kalb wrote:
Now I am looking at the change in the range function. I completely understand
the differences between, and the reasons for, how range works differently in
Python 2 vs Python 3. The problem that I've run into has to do with how to
explain what range does in
On Thu, Jun 29, 2017 at 2:57 PM, Irv Kalb wrote:
> Now I am looking at the change in the range function. I completely
> understand the differences between, and the reasons for, how range works
> differently in Python 2 vs Python 3. The problem that I've run into has to
> do with how to explai
On Fri, Jun 30, 2017 at 6:57 AM, Irv Kalb wrote:
> I am wondering if other teachers have run into this. Is this a real problem?
> If so, is there any other way of explaining the concept without getting into
> the underlying details of how a generator works? Do you think it would be
> helpful
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