CODEWITHSUNDEEP
python
Igor Golodnitsky
Igor Golodnitsky

Reputation: 4566

Object class override or modify

Is it possible to add a method to an object class, and use it on all objects?

Upvotes: 4

Views: 1837

Answers (3)

Alex Martelli
Alex Martelli

Reputation: 882411

No, Python's internals take great care to make built-in types NOT mutable -- very different design choices from Ruby's. It's not possible to make object "monkeypatchable" without deeply messing with the C-coded internals and recompiling the Python runtime to make a very different version (this is for the classic CPython, but I believe exactly the same principle holds for other good implementations such as Jython and IronPython, just s/C/Java/ and S/C/C#/ respectively;-).

Upvotes: 5

Bite code
Bite code

Reputation: 597233

In Python attributes are implemented using a dictionary :

>>> t = test()
>>> t.__dict__["foo"] = "bla"
>>> t.foo
'bla'

But for "object", it uses a 'dictproxy' as an interface to prevent such assignement :

>>> object.__dict__["test"] = "test"
TypeError: 'dictproxy' object does not support item assignment

So no, you can't.

NB : you can't modify the metaclass Type directly neither. But as Python is very flexible, I am sure a Guru could find a way to achieve what you want. Any black wizard around here :-) ?

Upvotes: 8

Georg Schölly
Georg Schölly

Reputation: 126165

>>> object.test = "Test"
Traceback (most recent call last):
  File "", line 1, in 
TypeError: can't set attributes of built-in/extension type 'object'

Doesn't look like it. (Python 2.5.1)

Upvotes: 0

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