How To Make a Calculator Program in Python 3

Python 3 Calculator

Python 3 Calculator

Welcome to the Python 3 Calculator tutorial! In this tutorial, we will be creating a simple calculator program in Python 3 that can perform basic arithmetic operations such as addition, subtraction, multiplication, and division.

To get started, we will create a new Python file and name it "calculator.py". Open the file in your text editor or IDE and let's begin!

Step 1: Getting User Input

The first step in creating our calculator program is to get user input. We will use the input() function in Python to prompt the user for two numbers and the operation they want to perform.

	num1 = input("Enter the first number: ")
	num2 = input("Enter the second number: ")
	operation = input("Enter the operation (+, -, *, /): ")

The input() function returns a string, so we will need to convert the user input to a float using the float() function. We will also add some error checking to make sure the user inputs valid numbers and a valid operation.

	try:
		num1 = float(num1)
		num2 = float(num2)
	except ValueError:
		print("Invalid input. Please enter valid numbers.")
		exit()

	if operation not in ['+', '-', '*', '/']:
		print("Invalid operation. Please enter a valid operation (+, -, *, /).")
		exit()

Step 2: Performing the Calculation

Now that we have our user input, we can perform the calculation based on the operation the user entered. We will use a series of if statements to check the operation and perform the appropriate calculation.

	if operation == '+':
		result = num1 + num2
	elif operation == '-':
		result = num1 - num2
	elif operation == '*':
		result = num1 * num2
	elif operation == '/':
		result = num1 / num2

Finally, we will print out the result of the calculation using the print() function.

	print("Result: ", result)

Step 3: Putting It All Together

Here is the complete code for our Python 3 calculator program:

	num1 = input("Enter the first number: ")
	num2 = input("Enter the second number: ")
	operation = input("Enter the operation (+, -, *, /): ")

	try:
		num1 = float(num1)
		num2 = float(num2)
	except ValueError:
		print("Invalid input. Please enter valid numbers.")
		exit()

	if operation not in ['+', '-', '*', '/']:
		print("Invalid operation. Please enter a valid operation (+, -, *, /).")
		exit()

	if operation == '+':
		result = num1 + num2
	elif operation == '-':
		result = num1 - num2
	elif operation == '*':
		result = num1 * num2
	elif operation == '/':
		result = num1 / num2

	print("Result: ", result)

Save the file and run it in your Python environment to test it out!

Conclusion

Congratulations! You have

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