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Figure 1-1. String indexing Let s say we want to find the last character in a string. You can see from Figure 1-1 that the last character is i at offset 9, but what if we don t know the string ahead of time We could have extracted the string from a file, or the player may have typed it in a high score table. To find the last offset, we first need to find the length of the string, which we can do with the len function. Think of a function as stored Python code; you pass the function some information, which it uses to carry out an action and then return, possibly with new information. This is exactly what len does; we give it a string and it returns the length of that string. Let s try the len function on my_string: >>> len(my_string) 10 There are 10 characters in my_string, but we can t use 10 as an offset because it is right at the end of the string. To get the end character, we need the offset before 10, which is simply 9, so we subtract 1. Here s how to use len to find the last character in a string: >>> my_string[len(my_string)-1] 'i' Easy enough, I hope you will agree! But Python can make it even easier for us by using negative indexing. If you index with a negative number, Python treats it as an offset from the end of the string, so [-1] is the last character, [-2] is the second-to-last character, and so forth (see Figure 1-2).

If your router doesn t support UPnP or cannot be configured automatically, don t worry, you can manually configure port forwarding on your router, as follows:

Project: The Project field is filled in with the current project in the workspace. If you ve been following along, that should default to test; otherwise, use the Browse button to select the project with the test code. Connection Type: The default value is Standard (Socket Attach). There s no need to change this value. Host: This is the host name or IP address of the machine where Java was run, waiting for a connection. The default value is localhost; change this to the IP address of the machine where test.jar is being run. Port: Use the same value as the argument to address= when running the program. In this example, the value is 54321

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After you complete the page, click Apply and then Debug. The connection happens very quickly, and Eclipse switches to the debugging perspective by default. Remote debugging looks much like local debugging; if you re observant, you ll notice the IP address and port number in the call stack (two lines above the highlighted line in Figure 10-8) that shows that Eclipse is remotely debugging the class. Remotely debugging a complex Java application is essentially the same as doing so for this small example class. The arguments sent to the Java VM are the same for controlling the debugging session; the class path and initial class are, of course, different.

Draws a rectangle Draws a polygon (shape with three or more sides) Draws a circle Draws an ellipse Draws an arc Draws a line Draws several lines Draws an antialiased (smooth) line Draws several antialiased lines

Caution Configuring port forwarding on your particular router may be different from the steps that are described next, so check your router documentation before you continue, to ensure that you don t make any mistakes.

Embedding the shell on an embedded device isn t a demanding activity. The Bash shell is statically linked (so it runs under most circumstances); and all distributions come with a shell or some sorts, because this is necessary to run the startup scripts for the system. Using what comes with the distribution is usually a good approach, unless you need a shell other than the default.

1. Connect to your router (you may need to check your documentation to find out how to do this). 2. Click the Firewall icon to access the firewall settings on the router.

This function draws a rectangle onto a surface. In addition to the destination surface and color, pygame.rect takes the dimensions of the rectangle you want to draw and the width of the line. If you set width to 0 or omit it, the rectangle will be filled with solid color; otherwise, just the edges will be drawn.

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