问未附加到列表并打印的另一个类的属性。

EN

class Course:
    def __init__(self, number, credit, grade):
        #validgrades = ['A','B','C','D','F','IP']
        #if grade not in validgrades:
            #raise CourseError("bad grade" + "'" + grade + "'" )
        self.number = number #string
        self.credit = credit #int
        self.grade = grade #string
    def __str__(self):
        return ('%s: credit %d, grade %s' % (self.number, self.credit, self.grade))
    def __eq__(self,other):
        return self.number==other.number and self.credit==other.credit and self.grade==other.grade
    def is_passing(self):

        if self.grade == 'F' or self.grade == 'IP':
            return False
        else:
            return True
c1 = Course("CS112",4,"A")
print(c1)
print(c1.is_passing())
c2 = Course("ENGH101", 3, "B")
print(c1==c2)
c3 = Course("MATH113", 4, "IP")

class Transcript:

    def __init__(self):
        courses = []
        self.courses = courses


    def __str__(self):
        strtrans=""
        strtrans +='Transcript:\n'
        for i in self.courses:
            strtrans+= '%s\n\t' %(i)
        return strtrans

    def __eq__(self,other):
        if self.courses == other.courses:
            return True
        else:
            return False
    def add_course(self,course):
        for i in self.courses:
            self.courses.append(course)

    def course_by_number(self, number):
        for i.number in self.courses:
            if self.number == number:
                print('It worked!')
                return True
            elif self.number == None:
                return None
            else:
                return False
t=Transcript()
print(t)
t.add_course(c1)
t.add_course(c2)
t.add_course(c3)
print(t)