Re: Retrieving the name of the class calling an instance method

[Maric Michaud]

Le Friday 05 September 2008 17:29:39 mercado mercado, vous avez écrit*:

In Python, is it possible for an instance method to know the name of the
class which is calling it? For example, in the sample below, I would like
for the someMethod method to print the name of the class calling it ("bar"
in the first case, "again" in the second).

Note that "self" for somemethod is just a local variable of the calling
function. You cannot retrieve those local variables without playing with the
call stack, and this reveal generally a bad design (except for inspection
purpose).

You have two common solutions here :
- the simplest is to pass the instance of bar or again to the foo constructor
or as parameter of someMethod, or
- attach the foo instance to self in both cases and define a proper __get__
method in foo, this is far more complex and add magic to the foo class, I
don't recommand this unless you understand well the descriptor protocol.

>
---------------------------------------
class foo():
def someMethod(self):
print x

class bar():
def __init__(self):
f = foo()
f.someMethod()

class again():
def __init__(self):
f = foo()
f.someMethod()

bar()
again()
---------------------------------------

--
_____________

Maric Michaud