On 12/07/2017 10:28 AM, Ethan Furman wrote:
The simple answer is No, and all the answers agree on that point.
It does beg the question of what an identity function is, though.
Thankfully, Paul answered that question with a good explanation*.
Thanks, everyone, for the discussion.
--
~Ethan~
Nathan Ernst writes:
> There is a built-in identity function in Python. The function is called
> 'id'.
It should be clear from the rest of the thread. But, to be explicit:
That's not what is meant by “identity function”, and the Python ‘id’
function is not an identity function.
The Python ‘id’
Ethan Furman writes:
> My contention is that an identity function is a do-nothing function
> that simply returns what it was given:
>
> --> identity(1)
> 1
>
> --> identity('spam')
> 'spam'
These seem good to me. One argument given, the same result returned.
> --> identity('spam', 'eggs', 7)
>
On 7 December 2017 at 20:35, Chris Angelico wrote:
> Because it's impossible to return multiple values. IMO the "identity
> function" is defined only in terms of one single argument, so all of
> this is meaningless.
Indeed, this is the key point. The Python language only allows
returning one valu
Chris Angelico writes:
> On Fri, Dec 8, 2017 at 6:29 AM, Lele Gaifax wrote:
>> Chris Angelico writes:
>>
>>> On Fri, Dec 8, 2017 at 5:53 AM, Peter Otten <__pete...@web.de> wrote:
Hm, what does -- and what should --
identity(('spam', 'eggs', 7))
produce?
>>>
>>> The
On Fri, Dec 8, 2017 at 8:30 AM, Lele Gaifax wrote:
> Chris Angelico writes:
>
>> On Fri, Dec 8, 2017 at 6:29 AM, Lele Gaifax wrote:
>>> Chris Angelico writes:
>>>
On Fri, Dec 8, 2017 at 5:53 AM, Peter Otten <__pete...@web.de> wrote:
>
> Hm, what does -- and what should --
>
>>>
On 12/07/2017 12:24 PM, Peter Otten wrote:
identity((a, b, c))
calls identity() with one argument whereas
identity(a, b, c)
calls identity() with three arguments. That's certainly an effect; you just
undo it with your test for len(args) == 1. That means that your identity()
function throws aw
On Fri, Dec 8, 2017 at 7:25 AM, Ned Batchelder wrote:
> On 12/7/17 2:41 PM, Ethan Furman wrote:
>>
>> On 12/07/2017 11:23 AM, Ned Batchelder wrote:
>>>
>>> On 12/7/17 1:28 PM, Ethan Furman wrote:
>>
>>
--> identity('spam', 'eggs', 7)
('spam', 'eggs', 7)
>>>
>>>
>>> I don't see why this l
On 12/7/17 2:41 PM, Ethan Furman wrote:
On 12/07/2017 11:23 AM, Ned Batchelder wrote:
On 12/7/17 1:28 PM, Ethan Furman wrote:
--> identity('spam', 'eggs', 7)
('spam', 'eggs', 7)
I don't see why this last case should hold. Why does the function
take more than one argument? And if it does,
Ethan Furman wrote:
> On 12/07/2017 10:53 AM, Peter Otten wrote:
>> Ethan Furman wrote:
>>
>>> The simple answer is No, and all the answers agree on that point.
>>>
>>> It does beg the question of what an identity function is, though.
>>>
>>> My contention is that an identity function is a do-noth
There is a built-in identity function in Python. The function is called
'id'. See https://docs.python.org/3/library/functions.html#id Note that
this will not behave the same across different Python runtimes. e.g.
CPython, IronPython or Jython all implement this differently.
An example:
Python 3.5
On 12/07/2017 11:46 AM, Paul Moore wrote:
On 7 December 2017 at 18:28, Ethan Furman wrote:
The simple answer is No, and all the answers agree on that point.
It does beg the question of what an identity function is, though.
My contention is that an identity function is a do-nothing function th
On 7 December 2017 at 18:28, Ethan Furman wrote:
> The simple answer is No, and all the answers agree on that point.
>
> It does beg the question of what an identity function is, though.
>
> My contention is that an identity function is a do-nothing function that
> simply returns what it was given
On 12/07/2017 11:23 AM, Ned Batchelder wrote:
On 12/7/17 1:28 PM, Ethan Furman wrote:
--> identity('spam', 'eggs', 7)
('spam', 'eggs', 7)
I don't see why this last case should hold. Why does the function take more
than one argument? And if it does, then
why doesn't it work like this?
On Fri, Dec 8, 2017 at 6:29 AM, Lele Gaifax wrote:
> Chris Angelico writes:
>
>> On Fri, Dec 8, 2017 at 5:53 AM, Peter Otten <__pete...@web.de> wrote:
>>>
>>> Hm, what does -- and what should --
>>>
>>> identity(('spam', 'eggs', 7))
>>>
>>> produce?
>>
>> The same thing. And so should identity(((
Chris Angelico writes:
> On Fri, Dec 8, 2017 at 5:53 AM, Peter Otten <__pete...@web.de> wrote:
>>
>> Hm, what does -- and what should --
>>
>> identity(('spam', 'eggs', 7))
>>
>> produce?
>
> The same thing. And so should identity((('spam', 'eggs', 7))) and
> identity'spam', 'eggs', 7 and
On 12/7/17 1:28 PM, Ethan Furman wrote:
The simple answer is No, and all the answers agree on that point.
It does beg the question of what an identity function is, though.
My contention is that an identity function is a do-nothing function
that simply returns what it was given:
--> identity(
On 12/07/2017 10:53 AM, Peter Otten wrote:
Ethan Furman wrote:
The simple answer is No, and all the answers agree on that point.
It does beg the question of what an identity function is, though.
My contention is that an identity function is a do-nothing function that
simply returns what it wa
On Fri, Dec 8, 2017 at 5:53 AM, Peter Otten <__pete...@web.de> wrote:
> Ethan Furman wrote:
>
>> The simple answer is No, and all the answers agree on that point.
>>
>> It does beg the question of what an identity function is, though.
>>
>> My contention is that an identity function is a do-nothing
Ethan Furman wrote:
> The simple answer is No, and all the answers agree on that point.
>
> It does beg the question of what an identity function is, though.
>
> My contention is that an identity function is a do-nothing function that
> simply returns what it was given:
>
> --> identity(1)
> 1
The simple answer is No, and all the answers agree on that point.
It does beg the question of what an identity function is, though.
My contention is that an identity function is a do-nothing function that simply
returns what it was given:
--> identity(1)
1
--> identity('spam')
'spam'
--> ide
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