instance method questions

[Danny]

howdy,

I have created an instance method for an object using new.instancemethod. It
works great. Now the questions are:

1) how do I dynamically inspect an object to determine if it has an instance
method? (there is a class method with the same name)

2) how do I dynamically delete the instance method?

thanks,
Danny

[Frederick Polgardy]

On Aug 22, 10:23 am, Danny <[e-mail]:

1) how do I dynamically inspect an object to determine if it has an instance
method? (there is a class method with the same name)

class Foo:
def foo(self):
pass

x = Foo()

import types

>>isinstance(x.foo, types.MethodType)

True

2) how do I dynamically delete the instance method?

>From the instance? You can't, you have to delete it from the class:

>>del Foo.foo

[Peter Otten]

Danny wrote:

I have created an instance method for an object using new.instancemethod.
It works great. Now the questions are:

1) how do I dynamically inspect an object to determine if it has an
instance method? (there is a class method with the same name)

Why would you want to do that?

Here is a way that relies on an implementation detail of current CPython:

>>class Foo(object):

.... def foo(self): pass
.... def __init__(self):
.... import new
.... def bar(self): pass
.... self.foo = new.instancemethod(bar, self)
....

>>x = Foo()
x.foo is x.foo

True

>>del x.foo
x.foo is x.foo

False

This alternative is a little less subtle:

>>y = Foo()
"foo" in y.__dict__

True

>>del y.foo
"foo" in y.__dict__

False

Peter