c

class Student:
    def __init__(self, name, id, subject):
        self.name = name
        self.id = id
        self.subject = subject

    def __str__(self):
        return '{}\'s id is {} and has taken the following subjects {}'.format(self.name, self.id,self.subject)

s = Student('cat', 123,[('comp1100', 78), ('comp1500',87)])

print(str(s))