mutexinit 0.0

This package provides a metaclass and a decorator to enable mutually exclusive constructors for Python classes.

All you need to do is just make a class with the MutexInitMeta metaclass and declare each mutually exclusive constructor as a instance method, and also decorate it with @subinit decorator.

Here is a simple example:

from mutexinit import MutexInitMeta, subinit

class MyClass(object):
    __metaclass__ = MutexInitMeta

    @subinit
    def foo(self, bar, baz):
        print('Running "foo" constructor')

    @subinit
    def bar(self, foo, baz):
        print('Running "bar" constructor')

This is all to make a class to have mutually exclusive constructors. After defining the class, go ahead, and initialise it:

>>> my_instance1 = MyClass(bar=1, baz=2)
Running "foo" constructor
>>> my_instance2 = MyClass(foo=9, baz=8)
Running "bar" constructor
>>> my_instance2 = MyClass(foo=None, baz=8)
AttributeError: Mutex init arguments cannot be None