³ò Ü‘RMc@s8dZdefd„ƒYZd„ZhZd„ZdS(s  Two magic tricks for classes: class X: __metaclass__ = extendabletype ... # in some other file... class __extend__(X): ... # and here you can add new methods and class attributes to X Mostly useful together with the second trick, which lets you build methods whose 'self' is a pair of objects instead of just one: class __extend__(pairtype(X, Y)): attribute = 42 def method((x, y), other, arguments): ... pair(x, y).attribute pair(x, y).method(other, arguments) This finds methods and class attributes based on the actual class of both objects that go into the pair(), with the usual rules of method/attribute overriding in (pairs of) subclasses. For more information, see test_pairtype. textendabletypecBseZdZd„ZRS(s€A type with a syntax trick: 'class __extend__(t)' actually extends the definition of 't' instead of creating a new subclass.cCsŠ|djoZxO|D]G}x>|iƒD]0\}}|djoq'nt|||ƒq'WqWdSn tt|ƒi||||ƒSdS(Nt __extend__t __module__(titemstsetattrtNonetsuperRt__new__(tclstnametbasestdicttkeytvalue((s&/64/home/arigo/u/pypy/tool/pairtype.pyR!s   (t__name__Rt__doc__R(((s&/64/home/arigo/u/pypy/tool/pairtype.pyRscCs%t|i|iƒ}|||fƒS(sReturn a pair object.(tpairtypet __class__(tatbttp((s&/64/home/arigo/u/pypy/tool/pairtype.pytpair.sc CsØyt||f}Wn½tj o±d|i|if}g}|iD]}|t||ƒqI~}g}|iD]}|t||ƒqv~} t|| ƒptf} t|| hƒ}t||fs