One Two Two
TABLE OF CONTENTS
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
Appendix A: Command Line Crash Course
LEARN THE HARD WAY
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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!
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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
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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