s = "9.30am:10.30pm"
s.split(":")

['9.30am', '10.30pm']

result = []
result.append("Tony")
print(result)

['Tony']

d = {"A": 4, "B":3, "C":2, "D":1, "F":0}
list(d.items())

[('A', 4), ('B', 3), ('C', 2), ('D', 1), ('F', 0)]

s1 = [1,2,3]
s2 = [1,2,3]
s1.append(4)
print(s1,s2)

[1, 2, 3, 4] [1, 2, 3]

s1 = [1,2,3]
s2 = s1
s1.append(4)
print(s1,s2)

[1, 2, 3, 4] [1, 2, 3, 4]

class Student:

    # constructor method
    def __init__(self,n,m):
        self.name = n
        self.major = m
        self.grades = []

    # getter method
    def get_name(self):
        return self.name

    # getter method
    def get_major(self):
        return self.major

    # setter method
    def set_major(self,m):
        self.major = m
    
    # other method (can be called a modifier)
    def add_grade(self,c,t,g):
        self.grades.append((c,t,g))

    def gpa(self):
        num_grade = {"A": 4, "B":3, "C":2, "D":1, "F":0}
        points = 0
        credits = 0
        for c in self.grades:
            credits = credits + c[1]
            points = points + c[1] * num_grade[c[2]]
        if credits > 0:
            return round(points/credits,2)
        else:
            return None
    

s5 = Student("John","CSC")
print(s5.name,s5.major,s5.grades)
print(s5.get_name())

John CSC []
John

s2 = Student("Alice","Math")
print(s2.name,s2.major,s2.grades)
print(s2.get_name())

Alice Math []
Alice

s2.set_major("CSC")
print(s2.major)

CSC

s5.add_grade("1301",4,"A")
s5.add_grade("1302",4,"A")
s5.add_grade("2510",3,"C")

print(s5.grades)
print(s2.grades)

[('1301', 4, 'A'), ('1302', 4, 'A'), ('2510', 3, 'C')]
[]

print(s5.gpa())
print(s2.gpa())

3.45
None

38/11

3.4545454545454546

class Rational:

    def __init__(self,n,d):
        self.numerator = n
        self.denominator = d
        self.reduce()