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A Practical Introduction to

Python ProgrammingBrian Heinold

Department of Mathematics and Computer Science

Mount St. Mary"s University

©2012 Brian Heinold

Licensed under a

Cr eativeCommons Attribution-Noncommer cial-ShareAlike 3.0 Unported Li- cense

I Basics

1 Getting Started3

1.1 Installing Python

1.2 IDLE

1.3 A first program

1.4 Typing things in

1.5 Getting input

1.6 Printing

1.7 Variables

1.8 Exercises

2 For loops11

2.1 Examples

2.2 The loop variable

2.3 Therangefunction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.4 A Trickier Example

2.5 Exercises

3 Numbers19

3.1 Integers and Decimal Numbers

3.2 Math Operators

3.3 Order of operations

3.4 Random numbers

3.5 Math functions

3.6 Getting help from Python

3.7 Using the Shell as a Calculator

3.8 Exercises

4 If statements27

4.1 A Simple Example

4.2 Conditional operators

4.3 Common Mistakes

4.4elif. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

4.5 Exercises

30
iii ivCONTENTS

5 Miscellaneous Topics I

5.1 Counting

5.2 Summing

5.3 Swapping

5.4 Flag variables

5.5 Maxes and mins

5.6 Comments

5.7 Simple debugging

5.8 Example programs

5.9 Exercises

6 Strings43

6.1 Basics

6.2 Concatenation and repetition

6.3 Theinoperator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

6.4 Indexing

6.5 Slices

6.6 Changing individual characters of a string

6.7 Looping

6.8 String methods

6.9 Escape characters

6.10 Examples

6.11 Exercises

7 Lists57

7.1 Basics

7.2 Similarities to strings

7.3 Built-in functions

7.4 List methods

7.5 Miscellaneous

7.6 Examples

7.7 Exercises

8 More with Lists65

8.1 Lists and therandommodule. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

8.2split. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

8.3join. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

8.4 List comprehensions

8.5 Using list comprehensions

8.6 Two-dimensional lists

8.7 Exercises

CONTENTSv

9 While loops75

9.1 Examples

9.2 Infinite loops

9.3 Thebreakstatement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

9.4 The else statement

9.5 The guessing game, more nicely done

9.6 Exercises

10 Miscellaneous Topics II

10.1str,int,float, andlist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

10.2 Booleans

10.3 Shortcuts

10.4 Short-circuiting

10.5 Continuation

10.6pass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

10.7 String formatting

10.8 Nested loops

10.9 Exercises

11 Dictionaries99

11.1 Basics

11.2 Dictionary examples

100

11.3 Working with dictionaries

101

11.4 Counting words

102

11.5 Exercises

104

12 Text Files109

12.1 Reading from files

109

12.2 Writing to files

110

12.3 Examples

110

12.4 Wordplay

111

12.5 Exercises

113

13 Functions119

13.1 Basics

119

13.2 Arguments

120

13.3 Returning values

121

13.4 Default arguments and keyword arguments

122

13.5 Local variables

123

13.6 Exercises

125

14 Object-Oriented Programming

129

14.1 Python is objected-oriented

129

14.2 Creating your own classes

130

14.3 Inheritance

132

14.4 A playing-card example

133
viCONTENTS

14.5 A Tic-tac-toe example

136

14.6 Further topics

138

14.7 Exercises

138

II Graphics

141

15 GUI Programming with Tkinter

143

15.1 Basics

143

15.2 Labels

144

15.3grid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145

15.4 Entry boxes

146

15.5 Buttons

146

15.6 Global variables

148

15.7 Tic-tac-toe

149

16 GUI Programming II

155

16.1 Frames

155

16.2 Colors

156

16.3 Images

157

16.4 Canvases

158

16.5 Check buttons and Radio buttons

159

16.6Textwidget. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

16.7Scalewidget. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

16.8 GUI Events

162

16.9 Event examples

164

17 GUI Programming III

169

17.1 Title bar

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[PDF] [PDF] A Practical Introduction to Python Programming - Brian Heinold