Program to create grade calculator in Python

print("Enter Marks Obtained in 5 Subjects: ")
total1 = 44
total2 = 67
total3 = 76
total4 = 99
total5 = 58

tot = total1 + total2 + total3 + total4 + total4
avg = tot / 5

if avg >= 91 and avg <= 100:
    print("Your Grade is A1")
elif avg >= 81 and avg < 91:
    print("Your Grade is A2")
elif avg >= 71 and avg < 81:
    print("Your Grade is B1")
elif avg >= 61 and avg < 71:
    print("Your Grade is B2")
elif avg >= 51 and avg < 61:
    print("Your Grade is C1")
elif avg >= 41 and avg < 51:
    print("Your Grade is C2")
elif avg >= 33 and avg < 41:
    print("Your Grade is D")
elif avg >= 21 and avg < 33:
    print("Your Grade is E1")
elif avg >= 0 and avg < 21:
    print("Your Grade is E2")
else:
    print("Invalid Input!")

# Creating a dictionary which
# consists of the student name,
# assignment result test results
# and their respective lab results

# 1. Jack's dictionary
jack = {"name": "Jack Frost",
        "assignment": [80, 50, 40, 20],
        "test": [75, 75],
        "lab": [78.20, 77.20]
        }

# 2. James's dictionary
james = {"name": "James Potter",
         "assignment": [82, 56, 44, 30],
         "test": [80, 80],
         "lab": [67.90, 78.72]
         }

# 3. Dylan's dictionary
dylan = {"name": "Dylan Rhodes",
         "assignment": [77, 82, 23, 39],
         "test": [78, 77],
         "lab": [80, 80]
         }

# 4. Jessica's dictionary
jess = {"name": "Jessica Stone",
        "assignment": [67, 55, 77, 21],
        "test": [40, 50],
        "lab": [69, 44.56]
        }

# 5. Tom's dictionary
tom = {"name": "Tom Hanks",
       "assignment": [29, 89, 60, 56],
       "test": [65, 56],
       "lab": [50, 40.6]
       }

# Function calculates average


def get_average(marks):
    total_sum = sum(marks)
    total_sum = float(total_sum)
    return total_sum / len(marks)

# Function calculates total average


def calculate_total_average(students):
    assignment = get_average(students["assignment"])
    test = get_average(students["test"])
    lab = get_average(students["lab"])

    # Return the result based
    # on weightage supplied
    # 10 % from assignments
    # 70 % from test
    # 20 % from lab-works
    return (0.1 * assignment +
            0.7 * test + 0.2 * lab)


# Calculate letter grade of each student
def assign_letter_grade(score):
    if score >= 90:
        return "A"
    elif score >= 80:
        return "B"
    elif score >= 70:
        return "C"
    elif score >= 60:
        return "D"
    else:
        return "E"

# Function to calculate the total
# average marks of the whole class


def class_average_is(student_list):
    result_list = []

    for student in student_list:
        stud_avg = calculate_total_average(student)
        result_list.append(stud_avg)
        return get_average(result_list)


# Student list consisting the
# dictionary of all students
students = [jack, james, dylan, jess, tom]

# Iterate through the students list
# and calculate their respective
# average marks and letter grade
for i in students:
    print(i["name"])
    print("=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=")
    print("Average marks of %s is : %s " % (i["name"],
                            calculate_total_average(i)))

    print("Letter Grade of %s is : %s" % (i["name"],
             assign_letter_grade(calculate_total_average(i))))

    print()


# Calculate the average of whole class
class_av = class_average_is(students)

print("Class Average is %s" % (class_av))
print("Letter Grade of the class is %s "
      % (assign_letter_grade(class_av)))