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Spis treści

Head First Programming. A learner's guide to programming using the Python language eBook -- spis treści

• Head First Programming
• Dedication
• A Note Regarding Supplemental Files
• Advance Praise for Head First Programming
• Praise for other Head First books
• Authors of Head First Programming
• How to Use This Book: Intro
  • Who is this book for?
    • Who should probably back away from this book?
  • We know what youre thinking
  • We know what your brain is thinking
  • Metacognition: thinking about thinking
  • Heres what WE did
  • Heres what YOU can do to bend your brain into submission
  • Read Me
  • The technical review team
  • Acknowledgments
  • Safari Books Online
• 1. Starting to Code: Finding your way
  • Programming lets you do more
    • But what are g and guess?
  • So how do you run your code?
  • Create a new program file
  • Prepare and run your code
  • A program is more than a list of commands
  • Codeville: Your program is like a network of roads
  • Branches are code intersections
  • if/else branches
  • The Python code needs interconnecting paths
  • Python uses indents to connect paths
  • Loops let you run the same piece of code over and over again
  • Pythons while loop
  • Your Programming Toolbox
• 2. Textual Data: Every string has its place
  • Your new gig at Starbuzz Coffee
  • Heres the current Starbuzz code
  • The cost is embedded in the HTML
  • A string is a series of characters
  • Find characters inside the text
  • But how do you get at more than one character?
  • BeansRUs is rewarding loyal customers
    • The price moved
  • Searching is complex
  • Python data is smart
  • Strings and numbers are different
  • The program has overloaded the BeansRUs Server
  • Time... if only you had more of it
  • Youre already using library code
  • Order is restored
  • Your Programming Toolbox
• 3. Functions: Lets get organized
  • Starbuzz is out of beans!
  • What does the new program need to do?
  • Dont duplicate your code...
  • ...Reuse your code instead
  • Reuse code with functions
  • Always get things in the right order
  • Return data with the return command
  • Use the Force, Web Luke
  • The function always sends the same message
  • Use parameters to avoid duplicating functions
  • Someone decided to mess with your code
  • The rest of the program cant see the password variable
  • When you call a function, the computer creates a fresh list of variables
  • When you leave a function, its variables get thrown away
  • Starbuzz is fully stocked!
  • Your Programming Toolbox
• 4. Data in Files and Arrays: Sort it out
  • Surfs up in Codeville
  • Find the highest score in the results file
  • Iterate through the file with the open, for, close pattern
  • The file contains more than numbers...
  • Split each line as you read it
  • The split() method cuts the string
  • But you need more than one top score
  • Keeping track of 3 scores makes the code more complex
  • An ordered list makes code much simpler
  • Sorting is easier in memory
    • Keep the data in memory
  • You cant use a separate variable for each line of data
  • An array lets you manage a whole train of data
  • Python gives you arrays with lists
    • Arrays can be extended
  • Sort the array before displaying the results
  • Sort the scores from highest to lowest
  • And the winner is...?
  • You somehow forgot the surfer names
  • Your Programming Toolbox
• 5. Hashes and Databases: Putting data in its place
  • Who won the surfing contest?
  • Associate the name with the score
    • Use a hash
  • Associate a key with a value using a hash
  • Iterate hash data with for
  • The data isnt sorted
    • Python hashes dont have a sort() method...
    • ...but there is a function called sorted()
  • When data gets complex
    • So what does RSAs data look like?
  • Return a data structure from a function
  • Heres your new board!
  • Meanwhile, down at the studio...
  • The code remains the same; its the function that changes
  • TVNs data is on the money!
  • Your Programming Toolbox
• 6. Modular Programming: Keeping things straight
  • Head First Health Club is upgrading some systems
  • The program needs to create a transaction file
  • Use strings to format strings
  • A late night email ruins your day
  • $50,000... for a donut?!
  • Only the sales from your program were rejected
  • The new bank uses a new format
  • Your coffee bar program still uses the old format
  • Dont just update your copy
    • Smart programmers write modular code
  • So how do you create a module...?
    • ...and how do you use it?
  • The transaction file is working great, too
  • The health club has a new requirement
  • The Starbuzz code
  • The two discount functions have the same name
  • Fully Qualified Names (FQNs) prevent your programs from getting confused
  • The discounts get the customers flooding in
  • Your Programming Toolbox
• 7. Building a Graphical User Interface: Going all gooey
  • Head First TVN now produces game shows
  • pygame is cross platform
  • 0... 2... 1... 9... blast off!
  • tkinter gives you the event loop for free
  • tkinter is packed with options
  • The GUI works, but doesnt do anything
  • Connect code to your button events
  • The GUI programs now ready for a screentest
  • But TVN is still not happy
  • Label it
  • Your Programming Toolbox
• 8. Guis and Data: Data entry widgets
  • Head-Ex needs a new delivery system
  • Theyve already designed the interface
  • Read data from the GUI
  • The Entry and Text widgets let you enter text data into your GUI
    • Entry widget: for entering single lines of text
    • Text widget: for longer, multi-line text
  • Read and write data to text fields
  • Large Text fields are harder to handle
  • One of the Head-Ex deliveries went astray
  • Users can enter anything in the fields
  • Radio buttons force users to choose a valid depot
  • Creating radio buttons in tkinter
  • The radio buttons should work together
  • The radio buttons can share a model
  • The system tells the other widgets when the model changes
  • So how do you use models in tkinter?
  • Head-Exs business is expanding
  • There are too many depots on the GUI
  • An OptionMenu lets you have as many options as needed
  • The model stays the same
    • But wait... you dont have to list all the values like that
  • Things are going great at Head-Ex
  • Your Programming Toolbox
• 9. Exceptions and Message Boxes: Get the message?
  • Whats that smell?
  • Someone changed the file permissions
  • When it couldnt write to the file, the program threw an exception
  • Catch the exception
  • Watch for exceptions with try/except
  • Theres an issue with the exception handler
  • A message box demands attention
  • Creating message boxes in Python
    • Message boxes that say stuff
    • Message boxes that ask stuff
  • Your Programming Toolbox
• 10. Graphical Interface Elements: Selecting the right tool
  • Time to mix it up
  • The music just kept on playing...
  • Not all events are generated by button clicks
  • Controlling the Window Manager
  • Capturing the protocol event isnt enough
  • Two buttons, or not two buttons? That is the question...
  • The checkbox is an on/off, flip/flop toggle
  • Working with checkboxes in tkinter
    • Using the get() method
  • Pump up the volume!
  • Model a slider on a scale
    • Start with the volume
  • Use pygame to set the volume
  • Use tkinter for everything else
  • The DJ is over the moon!
  • Your Programming Toolbox
• 11. Custom Widgets and Classes: With an object in mind
  • The DJ wants to play more than one track
    • How will you create the widgets for each track?
  • Create code for each track as a function
  • The new function contains other functions
  • Your new function needs to create widgets and event handlers
  • The DJ is confused
  • Group widgets together
    • Create a new type of widget
  • A frame widget contains other widgets
  • A class is a machine for creating objects
  • A class has methods that define behavior
  • But how does an object call a method?
    • self identifies the widget calling the method
  • The SoundPanel class looks a lot like the create_gui() function
  • class = methods + data
  • The DJ has an entire directory of tracks
  • Its party time!
    • The mixer program brought the house down!
    • Congratulations!
  • Your Programming Toolbox
  • Leaving town...
  • Its been great having you here in Codeville!
• A. Leftovers: The Top Ten Things (we didnt cover)
  • #1: Doing things The Python Way
  • #2: Using Python 2
  • #3: Other programming languages
  • #4: Automated testing techniques
  • #5: Debugging
  • #6: Command-line execution
  • #7: Ooops... we couldve covered more OOP
  • #8: Algorithms
  • #9: Advanced Scary programming topics
  • #10: Other IDEs, shells, and text editors
• Index
• About the Authors
• Copyright