Metadata-Version: 1.0
Name: ducktypes
Version: 0.2.5
Summary: behaviour based duck typing library
Home-page: http://ducktypes.franzoni.eu
Author: Alan Franzoni
Author-email: username@franzoni.eu
License: APL 2.0
Description: .. -*- restructuredtext -*-
        
        =========
        ducktypes
        =========
        Duck typing support library
        ---------------------------
        
        Rationale
        =========
        
        Allows working with objects depending on their current behaviour, not their type or their registered (ABC-like) interface.
        
        Quick example::
        
            from ducktypes.ducktype import Duck
        
            class MyObject(object):
                def some_method(self, a, b):
                    pass
                def another_method(self, x):
                    pass
        
        
            class AnotherObject(object):
                def some_method(self, a, b):
                    pass
                def another_method(self, a):
                    pass
        
            class AnotherDifferentObject(object):
                def some_method(self, a, b, c):
                    pass
                def another_method(self, a):
                    pass
        
            duck = Duck(MyObject())
        
            print "AnotherObject instances implement MyObject interface: ", duck.maybe_implemented_by(AnotherObject())
            print "AnotherDifferentObject instances implement MyObject interface:", duck.maybe_implemented_by(AnotherDifferentObject())
        
        Output::
            
            AnotherObject instances implement MyObject interface:  True
            AnotherDifferentObject instances implement MyObject interface: False
        
        
        Gotchas
        =======
        
         * positional arguments are supposed to be called as positional arguments, and keyword arguments  are supposed to be called as positional arguments. If your client code calls keyword arguments as positional ones, signature matching may fail.
         * proxy-everything methods, i.e. ``(*args, **kwargs)``-like signature, will of course deceive our signature detection system.
        
        
        Todo
        ====
         * __getattr__ / __getattribute__ overriding functions
         * subclasses exposing special methods with different signature
         * C-declared functions that don't expose their signature.
         * implement optional strict checking.
        
        
        
Keywords: duck typing interfaces
Platform: UNKNOWN
