Python: call methods on default object

Question

Is it possible to call methods on a default object? To explain what I mean, here's an example:

There's Foo.py with a class:

class Foo:
    def fooMethod():
        print "doSomething"

fooObject = Foo()

And another pythonscript Bar.py:

from Foo import *
// what I can do now is:
fooObject.fooMethod()
// what I need is that this:
fooMethod()
// is automatically executed on fooObject if the method was not found in Bar.py

Is there any possibility to make this work? What I need is to set a "default"-object on which methods are executed if the method was not found.

Sven Marnach · Accepted Answer · 2012-04-01 14:38:47Z

3

This has been done in Python's random module. They use a simple and straight-forward solution:

class Foo:
    def foo_method(self):
        print "do something"

foo_object = Foo()
foo_method = foo_object.foo_method

It would also be possible to write some introspection code to automatically propagate all methods of Foo to the module namespace, but I recommend against doing so.

edited Apr 1, 2012 at 14:38

answered Apr 1, 2012 at 14:30

Sven Marnach

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4 Comments

JayTheKay Over a year ago

I know this is possible. The problem I have is that foo_object can be changed to be different object with different methods in the one module, so I would have to write:

JayTheKay Over a year ago

Sorry ignore first comment please ^^.. The problem I have is that foo_object can be changed to be a different object with different methods in the module I'm importing, so I would have to write an alias for every possible object-method that foo_object can have. I would'nt want to do that.

Sven Marnach Over a year ago

@kel: If foo_object changes, you want the module contents to magically change as well? This sounds like a terrible idea. Morover, what about other modules that did from Foo import * before? They will have to reimport everything. (Using from Foo import * in production code is generally a bad idea.)

JayTheKay Over a year ago

What I was really looking for was the functionality of getattr for classes or the setattr(module,name,attribute). I'm sorry, I think my question was not so clear. Thank you for your answer anyway =)

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