is it possible to dividing up a class in multiple files?

[Ziga Seilnacht]

Martin Höfling wrote:
> Hi there,
>
> is it possible to put the methods of a class in different files? I just
> want to order them and try to keep the files small.
>
> Regards
> 	Martin

You could use something like this:

"""
Example usage:

>>> class Person(object):
...     def __init__(self, first, last):
...         self.first = first
...         self.last = last
...
>>> john = Person('John', 'Smith')
>>> jane = Person('Jane', 'Smith')
>>> class Person(extend(Person)):
...     def fullname(self):
...         return self.first + ' ' + self.last
...
>>> john.fullname()
'John Smith'
>>> jane.fullname()
'Jane Smith'
"""

def extend(cls):
    extender = object.__new__(Extender)
    extender.class_to_extend = cls
    return extender


class Extender(object):

    def __new__(cls, name, bases, dict):
        # check that there is only one base
        base, = bases
        extended = base.class_to_extend
        # names have to be equal otherwise name mangling wouldn't work
        if name != extended.__name__:
            msg = "class names are not identical: expected %r, got %r"
            raise ValueError(msg % (extended.__name__, name))
        # module is added automatically
        module = dict.pop('__module__', None)
        if module is not None:
            modules = getattr(extended, '__modules__', None)
            if modules is None:
                modules = extended.__modules__ = [extended.__module__]
            modules.append(module)
        # replace the docstring only if it is not None
        doc = dict.pop('__doc__', None)
        if doc is not None:
            setattr(extended, '__doc__', doc)
        # now patch the original class with all the new attributes
        for attrname, value in dict.items():
            setattr(extended, attrname, value)
        return extended


Ziga