Module 3

Object Oriented Programming

Unit 10

Testing Code in Practice

Learning Outcomes

Write unit tests to ensure correct functionality of Python code.
Run pylint against a Python script to demonstrate stylistic correctness.
Document code for release to stakeholders.

Unit 10 Seminar: Packaging and Testing

Activity 1:

Run the following code using pylint and identify the errors.

Code:

                
def factorial (x)
    if x == 1:
        return 1

    else:   
        return (x * factorial(x-1))

num = 3
print("The factorial of", num, "is", factorial(num))

Response:

The function definition def factorial (x) contains an extra space between the function name and an argument. The correct syntax is def factorial(x).
The function definition lacks a colon at the end of the line. The correct syntax is def factorial(x):.
The function does not currently handle the base cases: x = 0 and x < 0. These cases require special handling to ensure correct factorial calculations.

Corrected Code:

                
def factorial(x):
if x == 0 or x == 1:
    return 1

if x < 0:
    raise ValueError("Factorial is not defined for negative numbers")

else:
    return (x * factorial(x-1))
                
                
num = 3
print("The factorial of", num, "is", factorial(num))

Activity 2:

In ‘Packaging & Testing’ (unit 9), we examined the use of documentation to support code developments. Add appropriate commenting and documentation for the code below.

Code:

                  
def add(x, y): 
return x + y 
def subtract(x, y): 
return x - y 
def multiply(x, y): 
return x * y 
def divide(x, y): 
return x / y 
print("Select operation.") 
print("1.Add") 
print("2.Subtract") 
print("3.Multiply") 
print("4.Divide") 
while True: 
choice = input("Enter choice(1/2/3/4): ")  
if choice in ('1', '2', '3', '4'): 
num1 = float(input("Enter first number: ")) 
num2 = float(input("Enter second number: ")) 
if choice == '1': print(num1, "+", num2, "=", add(num1, num2)) 
elif choice == '2': print(num1, "-", num2, "=", subtract(num1, num2)) 
elif choice == '3': print(num1, "*", num2, "=", multiply(num1, num2)) 
elif choice == '4': print(num1, "/", num2, "=", divide(num1, num2)) 
    break the while loop if answer is no next_calculation = input("Let's do next calculation? (yes/no): ") 
if next_calculation == "no": 
break 
else: print("Invalid Input")

Response:

                  
def add(x, y):
    """Returns the sum of x and y."""
    return x + y


def subtract(x, y):
    """Returns the difference of x and y."""
    return x - y


def multiply(x, y):
    """Returns the product of x and y."""
    return x * y


def divide(x, y):
    """Returns the quotient of x divided by y."""
    if y == 0:
        return "Error! Division by zero."
    return x / y
                
                
# Display operations menu
print("Select operation:")
print("1. Add")
print("2. Subtract")
print("3. Multiply")
print("4. Divide")
                
while True:
    # Prompt the user to choose an operation
    choice = input("Enter choice (1/2/3/4): ")

    # Input validation
    if choice in ('1', '2', '3', '4'):
        try:
            # Input two numbers for the calculation
            num1 = float(input("Enter first number: "))
            num2 = float(input("Enter second number: "))
        except ValueError:
            # Handle invalid value
            print("Invalid input! Please enter numeric values.")
            continue

        # Perform the selected operation
        if choice == '1':
            print(f"{num1} + {num2} = {add(num1, num2)}")
        elif choice == '2':
            print(f"{num1} - {num2} = {subtract(num1, num2)}")
        elif choice == '3':
            print(f"{num1} * {num2} = {multiply(num1, num2)}")
        elif choice == '4':
            result = divide(num1, num2)
            print(f"{num1} / {num2} = {result}")

        # Ask the user if they want to perform another calculation
        next_calculation = input(
            "Do you want to perform another calculation? (yes/no): ").lower()
        if next_calculation != "yes":
            print("Thank you for using the calculator. Goodbye!")
            break
    else:
        # Handle invalid operation choice
        print("Invalid Input! Please choose a valid operation (1/2/3/4).")

Reflection

My primary focus was on completing the Unit 11 summative assessment. Prior to commencing coding, I reviewed the tutor's feedback on the design document and the Unit 10 seminar recording to gain a thorough understanding of the assessment requirements and deliverables. I then dedicated the following days to coding, ultimately completing and submitting the assessment.

Module 3

Unit 10

Learning Outcomes

Unit 10 Seminar: Packaging and Testing

Reflection

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