PYTHON OOLITE MOD

It’s a substitution cipher that uses letter substitution to encrypt a string of text. The first cipher that you’ll look at is the Caesar cipher, named after Julius Caesar, who used it to secretly communicate messages.

In this section, you’ll look at two ciphers, the Caesar cipher and the Vigenère cipher. A cipher is a type of algorithm for performing encryption and decryption on an input, usually text. The Python modulo operator can be used to create ciphers.

PYTHON OOLITE MOD

You need to take the result, 17, and use mod to get its equivalent value in a twelve-hour context: On a twelve-hour clock, you can’t simply add 9 to 8 because you would get 17. The modulo operator is used when you want to compare a number with the modulus and get the equivalent number constrained to the range of the modulus.įor example, say you want to determine what time it would be nine hours after 8:00 a.m. A twelve-hour clock can be classified as “modulo 12,” sometimes shortened to “mod 12.” When counting on a twelve-hour clock, you count up to the modulus 12 and then wrap back to 1. A twelve-hour clock has a fixed set of values, from 1 to 12. All arithmetic operations performed on this number line will wrap around when they reach a certain number called the modulus.Ī classic example of modulo in modular arithmetic is the twelve-hour clock. Modular arithmetic deals with integer arithmetic on a circular number line that has a fixed set of numbers. The term modulo comes from a branch of mathematics called modular arithmetic. Free Bonus: Click here to get a Python Cheat Sheet and learn the basics of Python 3, like working with data types, dictionaries, lists, and Python functions.

Python oolite