Dekker a écrit : > Is it possible to override 'and' and/or 'or'? I cannot find a special > method for it... __and__ and __rand__ and __or__ and __ror__ are for > binary manipulation... any proposals?
http://docs.python.org/ref/customization.html """ __nonzero__( self) Called to implement truth value testing, and the built-in operation bool(); should return False or True, or their integer equivalents 0 or 1. When this method is not defined, __len__() is called, if it is defined (see below). If a class defines neither __len__() nor __nonzero__(), all its instances are considered true. """ Not that in Python, 'and' don't yield bools: >>> "aa" and "bb" 'bb' >>> "aa" and None # yields None >>> "aa" and 0 0 >>> "aa" or "bb" 'aa' >>> 0 or "bb" 'bb' >>> None or "bb" 'bb' >>> "aa" or 0 'aa' >>> "aa" or None 'aa' >>> HTH -- http://mail.python.org/mailman/listinfo/python-list
