GIF89a; EcchiShell v1.0
//usr/lib64/lib64/lib64/python2.7/Demo/ 0 could write: def m1_pre(self, arg): pass but one could equally write a derived class that makes a stronger requirement: def m1_pre(self, arg): require arg > 50 It would be easy to modify the classes shown here so that pre- and post-conditions can be disabled (separately, on a per-class basis). A different design would have the pre- or post-condition testing functions return true for success and false for failure. This would make it possible to implement automatic combination of inherited and new pre-/post-conditions. All this is left as an exercise to the reader. iÿÿÿÿ(t MetaClasst MetaHelpertMetaMethodWrappertEiffelMethodWrappercBseZd„Zd„ZRS(cCs‹tj|||ƒyt||jdƒ|_Wntk rLd|_nXyt||jdƒ|_Wntk r†d|_nXdS(Nt_pret_post(Rt__init__tgetattrt__name__tpretAttributeErrortNonetpost(tselftfunctinst((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pyRDs   cOsh|jrt|j||ƒnt|j|jf||ƒ}|jrdt|j|f||ƒn|S(N(R tapplyRRR (R targstkwtResult((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pyt__call__Ss   (Rt __module__RR(((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pyRBs t EiffelHelpercBseZeZRS((RRRt__methodwrapper__(((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pyR[stEiffelMetaClasscBseZeZRS((RRRt __helper__(((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pyR^stEiffelcCs0dtfd„ƒY}|ƒ}|jdƒdS(NtCcBs#eZd„Zd„Zd„ZRS(cSs|dS(Ni((R targ((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pytm1fscSs|dkstdƒ‚dS(Nisprecondition for m1 failed(tAssertionError(R R((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pytm1_prehscSs||kst‚dS(N(R(R RR((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pytm1_postjs(RRRRR (((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pyRes  i (RR(Rtx((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pyt_testds t__main__N(( t__doc__tMetaRRRRRRRR"R(((s//usr/lib64/python2.7/Demo/metaclasses/Eiffel.pyt>s