python - Monkey patching a @property -

is @ possible monkey patch value of @property of instance of class not control?

class foo:     @property     def bar(self):         return here().be['dragons']  f = foo() print(f.bar)  # baz f.bar = 42    # magic! print(f.bar)  # 42 

obviously above produce error when trying assign f.bar. # magic! possible in way? implementation details of @property black box , not indirectly monkey-patchable. entire method call needs replaced. needs affect single instance (class-level patching okay if inevitable, changed behaviour must selectively affect given instance, not instances of class).

subclass base class (foo) , change single instance's class match new subclass using __class__ attribute:

>>> class foo: ...     @property ...     def bar(self): ...         return 'foo.bar' ... >>> f = foo() >>> f.bar 'foo.bar' >>> class _subfoo(foo): ...     bar = 0 ... >>> f.__class__ = _subfoo >>> f.bar 0 >>> f.bar = 42 >>> f.bar 42