function name

Terry Reedy tjreedy at udel.edu
Wed Apr 28 22:09:29 CEST 2010


On 4/28/2010 3:20 PM, Alf P. Steinbach wrote:
> * Richard Lamboj:
>>
>> is there any way to get the name from the actual called function, so
>> that the
>> function knows its own name?
>
> There was an earlier thread about this not very long ago.
>
> General consensus, as I recall, to replace function with an object of a
> class (possibly with __call__ method if it is to be function-like,
> "functor").
>
> An alternative is to treat the function itself as an object. I posted
> code for a decorator to help do that. Of course today I deleted that
> code (I just use a single 'x.py' file for various examples), but you may
> find it by Googling; however, I recommend the consensus view of "real"
> object.
>
> A third way, even less desirable IMVHO, might be to use introinspection.
>
> Let's see, ... reusing that 'x.py' file again ...
>
> <code file="x.py">
> #Py3
>
> import inspect
>
> def foo():
> frame = inspect.currentframe()
> info = inspect.getframeinfo( frame )
> print( info )
>
> foo()
> </code>
>
> <output>
> Fatal Python error: Py_Initialize: can't initialize sys standard streams
> Traceback (most recent call last):
> File "C:\Program Files\cpython\python31\lib\encodings\__init__.py", line
> 31, in <module>
> import codecs
> File "C:\Program Files\cpython\python31\lib\codecs.py", line 8, in <module>
> """#"
> KeyboardInterrupt
>
> This application has requested the Runtime to terminate it in an unusual
> way.
> Please contact the application's support team for more information.
> </output>
>
>
> Oh my, I crashed the Python interpreter! This is my third time stumbling
> upon a crash-the-interpreter bug in CPython 3.x. I think I'm good at
> crashing things.

Perhaps you push harder, perhaps you are more observant and persistent 
in verifying such things.

However, in this case, with "Python 3.1.2 (r312:79149, Mar 21 2010, 
00:41:52) [MSC v.1500 32 bit (Intel)] on win32", I reproducibly get

Traceback(filename='C:\\Programs\\Python31\\misc\\t1.py', lineno=5, 
function='foo', code_context=['    info = inspect.getframeinfo( frame 
)\n'], index=0)

on fresh IDLE and

Traceback(filename='<stdin>', lineno=3, function='foo', 
code_context=None, index=None)

with a fresh command window. Both are more or less as expected. Were you 
using an earlier version? Different system? Did you run other code first?

Terry Jan Reedy




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