Finding the name of a function while defining it

Mitya Sirenef msirenef at lightbird.net
Thu Dec 27 09:03:34 CET 2012


On 12/27/2012 02:45 AM, Abhas Bhattacharya wrote:
> On Thursday, 27 December 2012 10:22:15 UTC+5:30, Tim Roberts  wrote:
>> Abhas Bhattacharya <abhasbhattacharya2 at gmail.com> wrote:
>>
>>> While I am defining a function, how can I access the name (separately as
>>> string as well as object) of the function without explicitly naming
>>> it(hard-coding the name)?
>>> For eg. I am writing like:
>>> def abc():
>>>     #how do i access the function abc here without hard-coding the name?
>>
>>
>> Why?  Of what value would that be?
>>
>>
>>
>> Note that I'm not merely being obstructionist here.  What you're asking
>>
>> here is not something that a Python programmer would normally ask.  The
>>
>> compiled code in a function, for example, exists as an object without a
>>
>> name.  That unnamed object can be bound to one or more function names, but
>>
>> the code doesn't know that.  Example:
>>
>>
>>
>> def one():
>>
>>      print( "Here's one" )
>>
>>
>>
>> two = one
>>
>>
>>
>> That creates one function object, bound to two names.  What name would you
>>
>> expect to grab inside the function?
>>
>>
>>
>> Even more obscure:
>>
>>
>>
>> two = lamba : "one"
>>
>> one = two
>>
>>
>>
>> Which one of these is the "name" of the function?
>>
>> -- 
>>
>> Tim Roberts, timr at probo.com
>>
>> Providenza & Boekelheide, Inc.
> It is of quite value to me.
> Because I have this situation:
> I have used a dictionary with "function_name":value pair in the top of the code. Now when some function is called, I need to print the value assigned to its name in the dictionary (the functions are defined after the dictionary). Now there is only one bad way-around for me: I need to hard-code the name in the function like this:
> def function_name():
>      print(dict_name.get("function_name"))
> but ofcourse it is a bad thing to do because I have a lot of this type of  functions. It would be better if I can can use the same code for all of them, because they are all essentially doing the same thing.
>
> Now, for your questions:
> If i call one() and two() respectively, i would like to see "one" and "two".
> I dont have much knowledge of lambda functions, neither am i going to use them, so that's something I cant answer.

How about defining a function that prints value and then calls a function?

def call(func_name):
   print(mydict[func_name])
   globals()[func_name]()


You could also define a custom class that does the same thing on attribute
lookup and do something like Call.func_name() .

  -m

-- 
Lark's Tongue Guide to Python: http://lightbird.net/larks/




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