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Learn Python 3 from Scratch

Arithmetic Operators and Data Types

Explore how to work with arithmetic operators in Python and understand the difference between string and integer data types. Learn to convert input strings to integers using the int() function and handle floating-point division results. This lesson helps you accurately perform addition, subtraction, multiplication, and division, meeting project requirements in Python programming.

We'll cover the following...

Back to our project

So far, we have covered good ground in learning how to code for some of the project requirements. Let’s take a look at our client’s requirements once again.

Project requirements that require printing on the screen
Project requirements that require printing on the screen

According to requirements 4 and 6, our app should be able to:

  • Perform calculations of addition, subtraction, multiplication, and division

  • Compute the actual answer to each question

So, let’s dive right in!

Adding two numbers

This should be easy: input two numbers and assign them to num1 and num2, then print num1+num2. Run the program below and see if we’re getting the expected outputInput 8 and 2. What should be the expected output of 8 + 2?. 

# Taking two numbers as input and storing inside two variables respectively
num1 = input("First number: ")
num2 = input("Second number: ")

# Displaying the result
print("The answer to ", num1, "+", num2, "is ", num1 + num2)
Program to add two numbers

Let’s say we enter 8 as the first number and 2 as the second number in the program above. But wait a minute! We get the output 82 instead of 10. Why do you think that is?

The data types and their conversion

In our code:

  1. When we use input(), it takes whatever we type and stores it ...