John M. Gabriele wrote: > Consider the following: > [snip] > #----------------------------------------------------------------- > class Parent( Grand_parent ): > > def speak( self ): > print '\tParent.speak()' > self.advise() > > def advise( self ): > print '\tParent.advise()' > self.critique() > > # ATM, the Parent is at a loss for words, and has no critique. > > > #----------------------------------------------------------------- > class Child( Parent ): > > def speak( self ): > print '\t\tChild.speak()' > self.advise() > > # Currently, the Child has no really useful advice to give. > > def critique( self ): > print '\t\tChild.critique()' > >
Since Child has no advice() method, it inherits the one for Parent. Thus, Child can be thought of as being defined as follows: . class Child( Parent ): . . def speak( self ): . print '\t\tChild.speak()' . self.advise() . . def advise( self ): # inherited from Parent . print '\tParent.advise()' . self.critique() . . def critique( self ): . print '\t\tChild.critique()' . Note that "self" refer to the *instance* created, not the *class*. > print 'speak() calls advise(), then advise() calls critique().' > print > > people = [ Grand_parent(), Parent(), Child() ] > for person in people: > person.speak() ### calls the instance's relevant method > print [snip] > > Child.speak() > Parent.advise() #inherited from Parent > Child.critique() > > Now, does the output make sense? André -- http://mail.python.org/mailman/listinfo/python-list
