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Index
Book Version 3 About This Book .................................................................................... Table of Contents .................................................................................. Chapter 1 - Making Paper Cryptography Tools ....................................................... What is Cryptography? .............................................................................. Making a Paper Cipher Wheel ........................................................................ A Virtual Cipher Wheel ............................................................................. How to Encrypt with the Cipher Wheel ............................................................... How to Decrypt with the Cipher Wheel ............................................................... A Different Cipher Tool: The St. Cyr Slide ......................................................... Practice Exercises, Chapter 1, Set A ............................................................... Practice Exercises, Chapter 1, Set B ............................................................... Programming a Computer to do Encryption ............................................................ Chapter 2 - Installing Python ...................................................................... Downloading and Installing Python .................................................................. Downloading pyperclip.py ........................................................................... The Featured Programs .............................................................................. Line Numbers and Spaces ............................................................................ Tracing the Program Online ......................................................................... More Info Links .................................................................................... Chapter 3 - The Interactive Shell ................................................................. Integers and Floating Point Values ................................................................. Order of Operations ................................................................................ Evaluating Expressions ............................................................................. Practice Exercises, Chapter 3, Set A ............................................................... Overwriting Variables .............................................................................. Using More Than One Variable ....................................................................... Variable Names ..................................................................................... Practice Exercises, Chapter 3, Set B ............................................................... Chapter 4 - Strings and Writing Programs .......................................................... String Concatenation with the + Operator ........................................................... String Replication with the * Operator ............................................................. Escape Characters .................................................................................. Quotes and Double Quotes ........................................................................... Practice Exercises, Chapter 4, Set A ............................................................... Negative Indexes ................................................................................... Blank Slice Indexes................................................................................. Practice Exercises, Chapter 4, Set B ............................................................... Hello World! ....................................................................................... Saving Your Program ................................................................................ Running Your Program ............................................................................... Opening The Programs You’ve Saved .................................................................. Functions........................................................................................... Ending the Program ................................................................................. Summary ............................................................................................ Chapter 5 - The Reverse Cipher .................................................................... Source Code of the Reverse Cipher Program .......................................................... Checking Your Source Code with the Online Diff Tool ................................................ The len() Function ................................................................................. Introducing the while Loop ......................................................................... The Boolean Data Type ..............................................................................
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