Build a Simple Python Calculator – Clean Code for Beginners! 💻
In this video, you'll learn how to create a simple calculator in Python using clean and readable code – perfect for beginners!
We’ll walk through the code step-by-step, cover basic arithmetic operations (add, subtract, multiply, divide), and include input validation and loop control. Whether you're just starting with Python or looking for a mini project to practice your skills, this is a great place to begin.
✅ Written in clean, modular Python
✅ User-friendly console interface
✅ Handles invalid input and division by zero
✅ Beginner-friendly explanation
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📁 Source code
def add(a, b):
return a + b
def subtract(a, b):
return a - b
def multiply(a, b):
return a * b
def divide(a, b):
if b == 0:
return "Error: Cannot divide by zero."
return a / b
def get_user_input():
try:
a = float(input("Enter the first number: "))
b = float(input("Enter the second number: "))
return a, b
except ValueError:
print("Please enter valid numbers.")
return get_user_input()
def display_menu():
print("\nChoose an operation:")
print("1. Add")
print("2. Subtract")
print("3. Multiply")
print("4. Divide")
def calculate():
while True:
display_menu()
choice = input("Enter the operation number (or 'q' to quit): ")
if choice.lower() == 'q':
print("Exiting the calculator. Goodbye!")
break
if choice not in ['1', '2', '3', '4']:
print("Invalid choice. Please try again.")
continue
a, b = get_user_input()
operations = {
'1': add,
'2': subtract,
'3': multiply,
'4': divide
}
result = operations[choice](a, b)
print("Result:", result)
if _name_ == "__main__":
calculate()
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