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