Question

Python GPA calculator:

Assume the user has a bunch of courses they took, and need to calculate the overall GPA.
We will need to get the grade and number of units for each course. It is not ideal to ask how many courses they took, as they have to manually count their courses. Programming is about automation and not manual work.
We will create a textual menu that shows 3 choices.
1. Input class grade and number of units. 2. Display Grade Point Average 3. Exit.
The user is expected to enter 1, and then enter a course grade and its number of units. They can then choose 1 and enter another course grade and units, or choose 2, and the code displays their GPA based on all the courses entered so far. If the user enters 3, the system quits. After the user chooses options 1 or 2, the code executes that menu option then shows the menu again. When the user chooses menu option 3, we do not repeat the menu.
This requires us to write code that follows this logic:
1. Write a function named show which has no arguments, and shows the following to the screen: 1. Input class grade and number of units. 2. Display Grade Point Average 3. Exit. then asks the user for a number to enter 1,2, or 3. If the user types 1,2, or 3 the function returns that value, otherwise the function displays an error message, and returns -1.
2. Write code for a function named grade, that does the following:
    * Call the function show (from step 1), and if the return value is 1
    * Get a grade and units from the user. Pass each to a function named valid (see below) to check if the grade is allowed(between 0 and 4), and the units are allowed(between 1 and 5).
    * If valid returns a true value on grade and its allowed range, and valid returns a true value on units and its allowed range, then accumulate grade*units to a global variable, and accumulate the units to another global variable. Otherwise (either grade or units is illegal) display an error message.
    * If from step 1 above, show returns 2, display the current GPA which is totalPoints/totalUnits.
    * Call grade after the user enters 1 or 2 (yes grade will call itself - this is recursion in its simplest form). This allows the code to display the menu again and the user gets to pick to enter more grades, or see their GPA, or quit.
    * What do you need to do if display from step 1 return -1 so the user sees the menu and gets to try again?
    * If step 1 above returns 3, then show a goodbye message. Make sure NOT to call grade in this case.
3. The function valid takes 3 integers: amount, upperBound and lowerBound. The function returns a true value if amount is more than or equal to lowerBound and less than or equal to the upperBound. Otherwise the function returns a false value.
4. What do you need to do to show how many courses the user took? Write that code.
It is common practice to place the main function code at the bottom and place the other functions above main. If you write more functions that call other functions, then the function that gets called is placed towards the top while the function that calls other functions is placed towards the bottom.
Add the call to activate grade at the very end.
Once you finish writing the code make sure to test it properly before uploading. Add comments as you see fit but make sure to add top level comments.

REMEMBER ONLY 3 FUNCTIONS SHOULD BE WRITTEN : SHOW, GRADE, AND VALID.

Answer 1

#code screenshot

#code to copy

totalPoints=0
totalUnits=0
couses=0

def show():
    print(f"\n\n1. Input class grade and number of units. \n2. Display Grade Point Average \n3. Exit.")
    choise=int(input("Enter The Input:"))
    if choise in [1,2,3]:       #if choise is not from 1,2 and 3
        return choise
    else:
        print("Error!, Please Enter valid choise")
        return -1

def valid(amount,upporbound,lowerbound):
    if amount in range(lowerbound,upporbound+1):        #amout>= lowerband and amount<=upperband , easily do using range function
        return True
    else:
        return False

def grade():
    while True:
        choise=show()
        if choise==1:
            while True:
                print("Enter Grade from 0 to 4 and Units from 1 to 5")
                grade=int(input("Enter Class Grade::"))
                no_of_units=int(input("Enter Units::"))
                if valid(grade,4,0) and valid(no_of_units,5,1):
                    global totalPoints              #using global variable here
                    global totalUnits
                    global couses
                    couses+=1
                    totalPoints += grade*no_of_units
                    totalUnits += no_of_units
                    break
                else:
                    print("\nPlease Enter Grade and units in valid range")
        elif choise==2:
            print(f"\nTotal Courses:{couses}    Total Point:{totalPoints}     TotalUnit:{totalUnits}")
            gpa=totalPoints/totalUnits
            print(f"Your GPA is:{gpa:.2f}")

        elif choise == 3:
            break               #if choise 3 than exit

if __name__ == '__main__':
    grade()

#output screenshot