Bind Python function as method

python_bind_function_as_method.py

# based on: http://stackoverflow.com/questions/1015307/python-bind-an-unbound-method#comment8431145_1015405
def bind(instance, func, as_name):
    """ Turn a function to a bound method on an instance

    .. doctest::

        >>> class Foo(object):
        ...     def __init__(self, x, y):
        ...         self.x = x
        ...         self.y = y
        >>> foo = Foo(2, 3)
        >>> my_unbound_method = lambda self: self.x * self.y
        >>> bind(foo, my_unbound_method, 'multiply')
        >>> # noinspection PyUnresolvedReferences
        ... foo.multiply()
        6

    :param instance: some object
    :param func: unbound method (i.e. a function that takes `self` argument, that you now
        want to be bound to this class as a method)
    :param as_name: name of the method to create on the object

    SIDE EFFECTS:
        - creates the new bound method on this instance, like you asked for
    """
    setattr(instance, as_name, func.__get__(instance, instance.__class__))