ohe · September 28, 2016 14:24
diff --git a/redefine.py b/redefine.py
 def redefine_instance_fn(obj, ext_fn, remote_name=None):
    """
    Given an object and a function, install the function as an instance method.
    Overrides any existing instance method with the same name.
    Preserves object identity.
    Uses name of function by default.

    Note: not a best practice, but sometimes necessary.
    >>> class A:
    ...     def __init__(self, val):
    ...         self.val = val
    ...     def f(self, x):
    ...         print self.val + str(x)
    >>> a = A('sdfs')
    >>> obj_id = id(a)
    >>> a.f(3)
    sdfs3
    >>> def f(self, x):
    ...     print self.val + str(x + 2)
    >>> def g(self, x):
    ...     print self.val + str(x + 1)
    >>> redefine_instance_fn(a, g, 'f')
    >>> obj_id == id(a)
    True
    >>> a.f(3)
    sdfs4
    >>> redefine_instance_fn(a, f, 'f')
    >>> obj_id == id(a)
    True
    >>> a.f(3)
    sdfs5
    """
    if remote_name is None:
        remote_name = ext_fn.__name__
    ft = type(getattr(obj, remote_name))
    setattr(obj, remote_name, ft(ext_fn, obj, obj.__class__))
	def redefine_instance_fn(obj, ext_fn, remote_name=None):
	"""
	Given an object and a function, install the function as an instance method.
	Overrides any existing instance method with the same name.
	Preserves object identity.
	Uses name of function by default.

	Note: not a best practice, but sometimes necessary.
	>>> class A:
	... def __init__(self, val):
	... self.val = val
	... def f(self, x):
	... print self.val + str(x)
	>>> a = A('sdfs')
	>>> obj_id = id(a)
	>>> a.f(3)
	sdfs3
	>>> def f(self, x):
	... print self.val + str(x + 2)
	>>> def g(self, x):
	... print self.val + str(x + 1)
	>>> redefine_instance_fn(a, g, 'f')
	>>> obj_id == id(a)
	True
	>>> a.f(3)
	sdfs4
	>>> redefine_instance_fn(a, f, 'f')
	>>> obj_id == id(a)
	True
	>>> a.f(3)
	sdfs5
	"""
	if remote_name is None:
	remote_name = ext_fn.__name__
	ft = type(getattr(obj, remote_name))
	setattr(obj, remote_name, ft(ext_fn, obj, obj.__class__))
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