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Re: Finding the name of a function while defining it

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On 12/27/12 04:58, Steven D'Aprano wrote:
> On Wed, 26 Dec 2012 23:46:31 -0800, Abhas Bhattacharya wrote:
> 
>>>> two = lamba : "one"
>>>> one = two
>>>
>>>> Which one of these is the "name" of the function?
> [...]
>> If i call one() and two() respectively, i would like to see "one" and
>> "two".
> 
> I'm afraid you're going to be disappointed. There is no possible way for 
> one() and two() as shown above to report different names, because they 
> are the same function object.
> 
> py> two = lambda : "one"
> py> one = two
> py> one is two
> True
> py> one, two
> (<function <lambda> at 0xb7abd92c>, <function <lambda> at 0xb7abd92c>)

And for similar fun:

  def call(fn, *args, **kwargs):
    return fn(*args, **kwargs)

  two = lambda : "one"
  one = two
  print(call(two))
  print(call(one))

Depending on where in the code you are, the same function object
also has a local name of "fn".  It's madness until you understand
it, and then it's beauty :)

-tkc

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Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-25 18:00 -0800
  Re: Finding the name of a function while defining it Roy Smith <roy@panix.com> - 2012-12-25 22:11 -0500
    Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-26 23:26 -0800
      Re: Finding the name of a function while defining it Chris Angelico <rosuav@gmail.com> - 2012-12-27 18:48 +1100
        Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-26 23:52 -0800
        Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-26 23:52 -0800
    Re: Finding the name of a function while defining it Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-12-27 12:59 +0000
  Re: Finding the name of a function while defining it Tim Roberts <timr@probo.com> - 2012-12-26 20:52 -0800
    Re: Finding the name of a function while defining it Chris Angelico <rosuav@gmail.com> - 2012-12-27 16:44 +1100
      Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-26 23:46 -0800
        Re: Finding the name of a function while defining it Chris Angelico <rosuav@gmail.com> - 2012-12-27 18:52 +1100
          Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-26 23:55 -0800
          Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-26 23:55 -0800
      Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-26 23:46 -0800
        Re: Finding the name of a function while defining it Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-12-27 10:58 +0000
          Re: Finding the name of a function while defining it Tim Chase <python.list@tim.thechases.com> - 2012-12-27 07:32 -0600
            Re: Finding the name of a function while defining it Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-12-27 13:34 +0000
          Re: Finding the name of a function while defining it Roy Smith <roy@panix.com> - 2012-12-27 10:09 -0500
            Re: Finding the name of a function while defining it Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-12-28 01:07 +0000
    Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-26 23:45 -0800
      Re: Finding the name of a function while defining it Mitya Sirenef <msirenef@lightbird.net> - 2012-12-27 03:03 -0500
        Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-27 00:26 -0800
          Re: Finding the name of a function while defining it Mitya Sirenef <msirenef@lightbird.net> - 2012-12-27 04:07 -0500
        Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-27 00:26 -0800
      Re: Finding the name of a function while defining it Chris Rebert <clp2@rebertia.com> - 2012-12-27 00:58 -0800
      Re: Finding the name of a function while defining it Tim Roberts <timr@probo.com> - 2012-12-28 21:01 -0800
      Re: Finding the name of a function while defining it Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2012-12-29 12:18 +0200
  Re: Finding the name of a function while defining it Chris Rebert <clp2@rebertia.com> - 2012-12-27 00:26 -0800
    Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-27 00:42 -0800
    Re: Finding the name of a function while defining it Abhas Bhattacharya <abhasbhattacharya2@gmail.com> - 2012-12-27 00:42 -0800
  Re: Finding the name of a function while defining it Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-12-27 13:31 +0000
    Re: Finding the name of a function while defining it alex23 <wuwei23@gmail.com> - 2012-12-27 17:25 -0800

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