Python Modulo: Using the % Operator (Overview)
Python supports a wide range ofarithmetic operators that you can use when working withnumbers in your code. One of these operators is themodulo operator (%), which returns the remainder of dividing two numbers. Modular operations are useful to check if a number is even or odd, simplifying cycling through data, and doing non-decimal based units conversion.
In this course, you’ll learn:
- Howmodulo works in mathematics
- How to use the Python modulo operator with differentnumeric types
- How Python calculates the results of amodulo operation
- How to override
.__mod__()in your classes to use them with the modulo operator - How to use the Python modulo operator to solvereal-world problems
The code in this course was tested with Python 3.9.0,% has not change much and older versions should be compatible.
00:00Welcome to Python Modulo in Practice, or How to Use the% Operator.My name is Chris and I will be your guide. In this course,you’ll learn about modular arithmetic,how to use the percent operator (%) withint andfloat types,common coding uses of the% operator, and how to use% with customclasses.
00:22Python’s% operator’s been around for a long time.The code I’m going to show you has all been tested using Python 3.9,but you should be able to use it in pretty much any version of Python.
00:34So, what’s it for? Well, the% operator does modular arithmetic.That means getting the remainder portion of doing some division.For example, 14 divided by 4 is 3 remainder 2.
00:483 times 12 is 12,and there’s 2 leftover. 14 mod 4 returns 2, the remainder from the division.Python’s operator for that mod operation is percent (%). Modulus pops up in a bunchof places inside of your code.
01:03Some common uses are detecting even versus odd numbers,looping on cycles of data, doing unit conversion—for example,if you want to take a large number of inches and turn it into feet and inchesif you’re using the American Imperial system.
01:19Or, if you want to take a large number of minutes and turn it into hours andminutes, you’ll need the modulus operation.
01:26Everything in Python is an object,so you can take advantage of this and write your own objects that support the% operator. You do this by overriding.__mod__().
Course Contents
