MIT OpenCourseWare http://ocw.mit.edu6.00 Introduction to Computer Science and ProgrammingFall 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms.6.00 Handout, Lecture 16 Not intended to make sense outside of lecture class Person(object): def __init__(self, family_name, first_name): self.family_name = family_name self.first_name = first_name def familyName(self): return self.family_name def firstName(self): return self.first_name def __cmp__(self, other): return cmp((self.family_name, self.first_name), (other.family_name, other.first_name)) def __str__(self): return '<Person: %s %s>'%(self.first_name, self.family_name) def say(self,toWhom,something): return self.first_name + ' ' + self.family_name + ' says to ' + toWhom.firstName() + ' ' + toWhom.familyName() + ': ' + something def sing(self,toWhom,something): return self.say(toWhom,something + ' tra la la') class MITPerson(Person): nextIdNum = 0 def __init__(self, familyName, firstName): Person.__init__(self, familyName, firstName) self.idNum = MITPerson.nextIdNum MITPerson.nextIdNum += 1 def getIdNum(self): return self.idNum def __str__(self): return '<MIT Person: %s %s>'%(self.first_name, self.family_name) def __cmp__(self,other): return cmp(self.idNum, other.idNum) ##p1 = MITPerson('Smith','Fred') ##p2 = MITPerson('Foobar','Jane') ##print p1.getIdNum() ##print p2.getIdNum() class UG(MITPerson): def __init__(self, familyName, firstName): MITPerson.__init__(self, familyName, firstName) self.year = None def setYear(self, year): if year > 5: raise OverflowError('Too many') self.year = year def getYear(self): return self.year def say(self,toWhom,something): return MITPerson.say(self,toWhom,'Excuse me, but ' + something) ## ##me = Person("Grimson", "Eric") ##ug = UG('Doe', 'Jane') class Prof(MITPerson): def __init__(self, familyName, firstName, rank): MITPerson.__init__(self, familyName, firstName) self.rank = rank self.teaching = {} def addTeaching(self, term, subj):try: self.teaching[term].append(subj) except KeyError: self.teaching[term] = [subj] def getTeaching(self, term): try: return self.teaching[term] except KeyError: return None def lecture(self,toWhom,something): return self.say(toWhom,something + ' as it is obvious') def say(self,toWhom,something): if type(toWhom) == UG: return MITPerson.say(self,toWhom,'I do not understand why you say ' + something) elif type(toWhom) == Prof: return MITPerson.say(self,toWhom,'I really liked your paper on ' + something) else: return self.lecture(something) ##me = Prof('Grimson', 'Eric', 'Full') ##me.addTeaching('F08', '6.00') ##me.addTeaching('S09', '6.00') ##me.addTeaching('S09', '6.xxx') ##print me.getTeaching('F08') ##print me.getTeaching('S09') ##print me.getTeaching('S08') ##print me.teaching class Faculty(object): def __init__(self): self.names = [] self.IDs = [] self.members = [] self.place = None def add(self,who): if type(who)!= Prof: raise TypeError('not a professor') if who.getIdNum() in self.IDs: raise ValueError('duplicate ID') self.names.append(who.familyName()) self.IDs.append(who.getIdNum()) self.members.append(who) def __iter__(self): self.place = 0 return self def next(self): if self.place >= len(self.names): raise StopIteration self.place += 1 return self.members[self.place-1] ##grimson = Prof('Grimson','Eric', 'Full') ##lozano = Prof('Lozano-Perez', 'Tomas', 'Full') ##guttag = Prof('Guttag', 'John', 'Full') ##barzilay = Prof('Barzilay', 'Regina', 'Associate') ##course6 = Faculty() ##course6.add(grimson) ##course6.add(lozano) ##course6.add(guttag) ##course6.add(barzilay) ## ##for p in course6:## print p.familyName() ## ## ##print ug.say(grimson,'I do not understand') ##print grimson.say(ug,'you do not understand') ##print grimson.say(guttag,'why the sky is blue') ## ##print ug.sing(ug,'I think I finally