By Wolfram Donat
Study Raspberry Pi Programming with Python will assist you to software your nifty new $35 desktop to make an internet spider, a climate station, a media server, and extra. You'll the right way to application in Python in your Raspberry Pi with hands-on examples and enjoyable projects.
Even if you're thoroughly new to programming mostly, you'll work out easy methods to create a house safeguard approach, an underwater images method, an RC aircraft with a digital camera, or even a near-space climate balloon with a camera.
You'll easy methods to make quite a few enjoyable or even worthy initiatives, from an internet bot to go looking and obtain documents to a toy to force your pets insane. You'll even how to use Pi with Arduino in addition to Pi with Gertboard, a variety board with an onboard ATmega microcontroller.
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You’ll do it too, but I hope to save you at least a little exasperation ahead of time. Third, Python ignores blank lines and spaces (except at the interactive prompt and indented blocks, of course) and comments. This is important because it frees you to make sure your code is readable to other programmers, even if that other programmer is you at a later date. N Note Comments in Python are preceded with a "#"; the program ignores anything on that line after it. Readability in your code is a big deal; expect me to drum that into your head regularly.
Emacs opening screen You can start typing immediately. Table 2-3 lists the most common commands in emacs. Table 2-3. Common Commands in emacs Command Keystroke(s) Open/New Ctrl+x + Ctrl+f Close Ctrl+x + Ctrl+c Save Ctrl+x + Ctrl+s Cut Ctrl+w Copy Alt+w Paste Ctrl+y Jump to beginning of line Ctrl+a Jump to end of line Ctrl+e Start/end select Ctrl+space 27 CHAPTER 2 N LINUX BY THE SEAT OF YOUR PANTS So, for instance, if you want to move a line of text, move your cursor to the beginning of the line.
Ni! Ni! Ni! or, to iterate through and print the characters themselves: for x in "Camelot": print x C a m e l o t Although the for loop’s syntax is a bit different than that of C or Java, once you get used to it, using the syntax becomes second nature. The other loop statement is the while statement. This statement evaluates a condition and continues to execute the indented block as long as that statement is true: x = 0 while (x < 10): print x x = x + 1 0 1 2 47 CHAPTER 3 N INTRODUCING PYTHON 3 4 5 6 7 8 9 Unlike what you may have expected, this code never prints “10,” because x is incremented after it’s printed.