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TABLE OF CONTENTS

Preface

The Hard Way Is Easier

Ex0: The Setup

Ex1: A Good First Program

Ex2: Comments And Pound Characters

Ex3: Numbers And Math

Ex4: Variables And Names

Ex5: More Variables And Printing

Ex6: Strings And Text

Ex7: More Printing

Ex8: Printing, Printing

Ex9: Printing, Printing, Printing

Ex10: What Was That?

Ex11: Asking Questions

Ex12: Prompting People

Ex13: Parameters, Unpacking, Variables

Ex14: Prompting And Passing

Ex15: Reading Files

Ex16: Reading And Writing Files

Ex17: More Files

Ex18: Names, Variables, Code, Functions

Ex19: Functions And Variables

Ex20: Functions And Files

Ex21: Functions Can Return Something

Ex22: What Do You Know So Far?

Ex23: Read Some Code

Ex24: More Practice

Ex25: Even More Practice

Ex26: Congratulations, Take A Test!

Ex27: Memorizing Logic

Ex28: Boolean Practice

Ex29: What If

Ex30: Else And If

Ex31: Making Decisions

Ex32: Loops And Lists

Ex33: While Loops

Ex34: Accessing Elements Of Lists

Ex35: Branches and Functions

Ex36: Designing and Debugging

Ex37: Symbol Review

Ex38: Doing Things To Lists

Ex39: Dictionaries, Oh Lovely Dictionaries

Ex40: Modules, Classes, And Objects

Ex41: Learning To Speak Object Oriented

Ex42: Is-A, Has-A, Objects, and Classes

Ex43: Gothons From Planet Percal #25

Ex44: Inheritance Vs. Composition

Ex45: You Make A Game

Ex46: A Project Skeleton

Ex47: Automated Testing

Ex48: Advanced User Input

Ex49: Making Sentences

Ex50: Your First Website

Ex51: Getting Input From A Browser

Ex52: The Start Of Your Web Game

Advice From An Old Programmer

Next Steps

Appendix A: Command Line Crash Course

LEARN THE HARD WAY

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DOCENDO  DISCIMUS

Exercise 7: More Printing

Now we are going to do a bunch of exercises where you just type code in and make it run. I won't be explaining this exercise because it is more of the same. The purpose is to build up your chops. See you in a few exercises, and do not skip! Do not paste!

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

print "Mary had a little lamb." print "Its fleece was white as %s." % 'snow' print "And everywhere that Mary went." print "." * 10 # what'd that do? end1 = "C" end2 = "h" end3 = "e" end4 = "e" end5 = "s" end6 = "e" end7 = "B" end8 = "u" end9 = "r" end10 = "g" end11 = "e" end12 = "r" # watch that comma at the end. try removing it to see what happens print end1 + end2 + end3 + end4 + end5 + end6, print end7 + end8 + end9 + end10 + end11 + end12

What You Should See

$ python ex7.py Mary had a little lamb. Its fleece was white as snow. And everywhere that Mary went. .......... Cheese Burger

Study Drills

For these next few exercises, you will have the exact same Study Drills.

Go back through and write a comment on what each line does.

Read each one backward or out loud to find your errors.

From now on, when you make mistakes, write down on a piece of paper what kind of mistake you made.

When you go to the next exercise, look at the mistakes you have made and try not to make them in this new one.

Remember that everyone makes mistakes. Programmers are like magicians who fool everyone into thinking they are perfect and never wrong, but it's all an act. They make mistakes all the time.

Common Student Questions

Why are you using the variable named 'snow'?

That's actually not a variable: it is just a string with the word snow in it. A variable wouldn't have the single-quotes around it.

Is it normal to write an English comment for every line of code like you say to do in Study Drill 1?

No, you write comments only to explain difficult to understand code or why you did something. Why is usually much more important, and then you try to write the code so that it explains how something is being done on its own. However, sometimes you have to write such nasty code to solve a problem that it does need a comment on every line. In this case it's strictly for you to practice translating code to English.

Can I use single-quotes or double-quotes to make a string or do they do different things?

In Python either way to make a string is acceptable although typically you'll use single-quotes for any short strings like 'a' or 'snow'.

Couldn't you just not use the comma , and turn the last two lines into one single-line print?

Yes, you could very easily, but then it'd be longer than 80 characters, which in Python is bad style.

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