Developers Day 2002 Making classes look like types (and vice versa) Or…

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Presentation transcript:

Developers Day 2002 Making classes look like types (and vice versa) Or…

Developers Day 2002 Compound W for Pythons object model Or…

Developers Day 2002 Goading Guido into describing something only he (fully) understands

(C) 2002 Zope Corp. 4 New stuff… properties descriptors (?) old-style classes (ok, old stuff) new builtins –object, super, property, staticmethod, classmethod, dict, … new-style classes method resolution order

(C) 2002 Zope Corp. 5 What about metaclasses…?

(C) 2002 Zope Corp. 6 What about metaclasses…? >>> brain.kaboom()

(C) 2002 Zope Corp. 7 More new stuff… __getattribute__() property interface –__get__() –__set__() –__delete__() __slots__ __mro__ __new__()

(C) 2002 Zope Corp. 8 Issues… Status of PEPs 252, 253, 254 More syntactic support –staticmethod –classmethod, etc… Limitations in extending C types –Adding C slots Documenting everything

(C) 2002 Zope Corp. 9 Questions… Has anybody used it for real? Usability? Functionality? Promoting this stuff from experimental status Getting rid of classic classes? Performance?

(C) 2002 Zope Corp. 10 References… Putting Metaclasses to Work: A New Dimension in Object-Oriented Programming, by Ira R. Forman and Scott H. Danforth. Addison-Wesley, 1999, ISBN