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Since a string can be thought of as a collection of characters, it is often useful to be able to refer to parts of it rather than as a whole. Python does this with the index operator, which consists of square brackets [], containing the offset of the character. The first character is [0], the second is [1], the third is [2], and so forth. Starting at 0 rather than 1 may seem a little odd, but it is a tradition among computer languages, and you will find it actually simplifies things when you write more Python code. Let s see string indexing in action. First we will create a variable containing a string, which we do just like numbers: >>> my_string = 'fugu-sashi' >>> print my_string 'fugu-sashi' Normally you would give strings a better name, but for this little example we will just call it my_string (the underscore character between my and string is used in place of a space because

The GNU version starts a remote debugging session, but breakpoints aren t honored and the program runs to completion after you connect from the development host.

Figure 11-7. Click OK to attempt to configure port forwarding. If port forwarding can be automatically configured for your router, it will be done now and you can skip to the Setting Up the Domain Name section of this chapter. However, if your router does not support UPnP it cannot be configured automatically and , you will see the failure message shown in Figure 11-8.

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This test ensures that the jar is runnable and the export was done properly. To test debugging, run the class from the command line again, this time using some extra parameters to start the debugging process on the target machine: $ java -Xdebug -Xrunjdwp:transport=dt_socket,server=y, \ suspend=y,address=54321 -cp test.jar hello Listening for transport dt_socket at address: 54321 The target now waits in this state for a connection. Table 10-2 provides a rundown of what these parameters mean (see Figure 10-7).

Python does not allow spaces in variable names). We can pick out individual letters from the string with the index operator: >>> my_string[0] 'f' >>> my_string[3] 'u' my_string[0] gives you a string with the first character in fugu-sashi, which is f. The second line gives you the fourth character, since the first character is offset 0 and not 1. Try to think of the offset not as the number of the character itself, but as the spaces between characters (see Figure 1-1); this will make the indexing a little more intuitive.

Starts the VM in debugging mode. Runs JDWP, the communication scheme use for remote debugging. The items following this parameter, which are separated by the colon (:) in the command line, are arguments that affect how this runs. Indicates that communication will be over a network socket. The other option is shared memory, which is used when you re debugging code locally. Means this instance of Java will wait for a connection from a remote machine. Tells the Java VM to suspend immediately. When N, the code runs and the remote machine attaches to the running process for debugging.

Figure 11-8. The router doesn t support UPnP and thus cannot be configured automatically. 3. Click OK to clear the message and proceed to the following section.

address=[host:]por Indicates what port to listen on when in server mode. This should be a value above 2000. host is optional and can be used to restrict the host that starts a debugging t session. To start the debugging session from Eclipse, create a Remote Java Application Debug Configuration by selecting Run Debug from the menu and double-clicking Remote Java Application at left. This creates a new debug configuration that you can populate with the right values to begin debugging:

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