Question

I found similar questions here, but my question is bit different…
I have log() function as staticmethod in MyUtil class:

class MyUtil(object):

    @staticmethod
    def log(message, level):
    ...

but now I have to know from which class/object this staticmethod was called?
For example:

class Deployer(object):

    def deploy(self):
        ...
        MyUtil.log ("Starting deployment", "info")
        ...

Is it possible to get and log this “Deployer” class name from MyUtil.log function?

(I’m aware that this is very un-OO and probably never useful in a well written program, but anyway…)

Answer 1

It’s not the nicest design, logging is a “singleton” with all of its drawbacks, but if you are willing to accept that, there’s some language support for your problem. You can get the caller by inspecting the stack:

import inspect

class MyUtil(object):
    @staticmethod
    def log(message, level):
        frame, module, line, function, context, index = inspect.stack()[1]
        self_name = frame.f_code.co_varnames[0]  # Name of the first argument (usually 'self')
        instance = frame.f_locals[self_name]
        class_name = instance.__class__.__name__
        print class_name

class Deployer(object):
    def deploy(self):
        MyUtil.log ("Starting deployment", "info")

Deployer().deploy()