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A Practical Introduction to
Python ProgrammingBrian Heinold
Department of Mathematics and Computer Science
Mount St. Mary"s University
ii©2012 Brian Heinold
Licensed under a
Cr eativeCommons Attribution-Noncommer cial-ShareAlike 3.0 Unported Li- censeContents
I Basics
11 Getting Started3
1.1 Installing Python
31.2 IDLE
31.3 A first program
41.4 Typing things in
51.5 Getting input
61.6 Printing
61.7 Variables
71.8 Exercises
92 For loops11
2.1 Examples
112.2 The loop variable
132.3 Therangefunction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4 A Trickier Example
142.5 Exercises
153 Numbers19
3.1 Integers and Decimal Numbers
193.2 Math Operators
193.3 Order of operations
213.4 Random numbers
213.5 Math functions
213.6 Getting help from Python
223.7 Using the Shell as a Calculator
223.8 Exercises
234 If statements27
4.1 A Simple Example
274.2 Conditional operators
284.3 Common Mistakes
284.4elif. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
4.5 Exercises
30iii ivCONTENTS
5 Miscellaneous Topics I
335.1 Counting
335.2 Summing
345.3 Swapping
355.4 Flag variables
365.5 Maxes and mins
365.6 Comments
375.7 Simple debugging
375.8 Example programs
385.9 Exercises
406 Strings43
6.1 Basics
436.2 Concatenation and repetition
446.3 Theinoperator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.4 Indexing
456.5 Slices
456.6 Changing individual characters of a string
466.7 Looping
466.8 String methods
476.9 Escape characters
486.10 Examples
496.11 Exercises
517 Lists57
7.1 Basics
577.2 Similarities to strings
587.3 Built-in functions
597.4 List methods
597.5 Miscellaneous
607.6 Examples
607.7 Exercises
628 More with Lists65
8.1 Lists and therandommodule. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8.2split. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
8.3join. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
8.4 List comprehensions
688.5 Using list comprehensions
698.6 Two-dimensional lists
708.7 Exercises
72CONTENTSv
9 While loops75
9.1 Examples
759.2 Infinite loops
789.3 Thebreakstatement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
9.4 The else statement
799.5 The guessing game, more nicely done
809.6 Exercises
8310 Miscellaneous Topics II
8710.1str,int,float, andlist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
10.2 Booleans
8910.3 Shortcuts
9010.4 Short-circuiting
9110.5 Continuation
9110.6pass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
10.7 String formatting
9210.8 Nested loops
9310.9 Exercises
9511 Dictionaries99
11.1 Basics
9911.2 Dictionary examples
10011.3 Working with dictionaries
10111.4 Counting words
10211.5 Exercises
10412 Text Files109
12.1 Reading from files
10912.2 Writing to files
11012.3 Examples
11012.4 Wordplay
11112.5 Exercises
11313 Functions119
13.1 Basics
11913.2 Arguments
12013.3 Returning values
12113.4 Default arguments and keyword arguments
12213.5 Local variables
12313.6 Exercises
12514 Object-Oriented Programming
12914.1 Python is objected-oriented
12914.2 Creating your own classes
13014.3 Inheritance
13214.4 A playing-card example
133viCONTENTS
14.5 A Tic-tac-toe example
13614.6 Further topics
13814.7 Exercises
138II Graphics
14115 GUI Programming with Tkinter
14315.1 Basics
14315.2 Labels
14415.3grid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
15.4 Entry boxes
14615.5 Buttons
14615.6 Global variables
14815.7 Tic-tac-toe
14916 GUI Programming II
15516.1 Frames
15516.2 Colors
15616.3 Images
15716.4 Canvases
15816.5 Check buttons and Radio buttons
15916.6Textwidget. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
16.7Scalewidget. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
16.8 GUI Events
16216.9 Event examples
16417 GUI Programming III
16917.1 Title bar
16917.2 Disabling things
16917.3 Getting the state of a widget
16917.4 Message boxes
17017.5 Destroying things
17117.6 Updating
17117.7 Dialogs
17217.8 Menu bars
17417.9 New windows
17417.10pack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
17.11StringVar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
17.12More with GUIs
17618 Further Graphical Programming
17718.1 Python 2 vs Python 3
17718.2 The Python Imaging Library
17918.3 Pygame
182CONTENTSvii
III Intermediate Topics
18319 Miscellaneous topics III
18519.1 Mutability and References
18519.2 Tuples
18719.3 Sets
18719.4 Unicode
18919.5sorted. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
19.6if-elseoperator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
19.7continue. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
19.8evalandexec. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191
19.9enumerateandzip. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .192
19.10copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .193
19.11More with strings
19419.12Miscellaneous tips and tricks
19519.13Running your Python programs on other computers
19620 Useful modules199
20.1 Importing modules
19920.2 Dates and times
20020.3 Working with files and directories
20220.4 Running and quitting programs
20420.5 Zip files
20420.6 Getting files from the internet
20520.7 Sound
20520.8 Your own modules
20621 Regular expressions
20721.1 Introduction
20721.2 Syntax
20821.3 Summary
21221.4 Groups
214quotesdbs_dbs17.pdfusesText_23