Eclipse Python Tutorial For Introduction To Programming -Books Pdf

Eclipse Python Tutorial For Introduction to Programming
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Launcher window now appears as shown in Figure 2 Enter c. in the Workspace field and click OK to display the Eclipse. UI as shown in Figure 3 If the workspace already contains. projects the projects will be displayed in the UI, Workspace is actually a directory that stores your project. files Click the Workbench icon to display the Eclipse user. interface as shown in Figure 4, You can start Eclipse by double clicking the eclipse. icon from the eclipse installation directory, The Workspace Launcher lets you choose a directory to. store projects, The Eclipse main window is the command center for the. The Eclipse UI is displayed,4 Install Python Plug in.
Follow the steps below to install Python Plug in,1 Choose Help Eclipse Marketplace to display the. Eclipse Marketplace window as shown in Figure 5, 2 Under the Search tab enter Python in the Find field. You will find the current Python IDL for Eclipse 3 6. or a later higher version,3 Click Install to install it. You can install plug ins for Eclipse in the Eclipse. Marketplace window,5 Create Python Project, Projects are like folders to hold Python files Before. creating a Python program you have to first create a. Follow the steps below to create a project, 1 Choose File New Project to display the New Project.
wizard as shown in Figure 6, 2 Select PyDev Project and click Next to display the. PyDev Project wizard as shown in Figure 7 Type,pybook in the Project name field As you type the. Directory field becomes c pybook, 3 Make sure that you choose Python as project type and. 3 0 as Grammar Version If the Interpreter is not, listed following the next section to configure a new. Python interpreter, 4 Uncheck the Create default src folder This step is.
optional If you check it a folder named src will be. created to hold Python source code The src folder,will be under c pybook. 5 Click Finish to create the project,Choose PyDev to create Python project. Enter a project and choose appropriate project,attributes. 6 Add Python Interpreter,Follow the steps below to configure a new Python. interpreter, 1 Click clicking here to configure an interpreter not.
listed to display the Preferences window as shown in. 2 Click New to open the Select Interpreter dialog box. as shown in Figure 8, 3 Locate the Python interpreter and click OK to add it. to Eclipse, You can add or remove a Python interpreter from this. Browse to locate a Python interpreter,7 Create a Python Program. Now you can create a program in the project by right click. on the pybook node to display a context menu as shown in. Figure 9 Choose New File to display the New File dialog. box as shown in Figure 10 Enter a file Welcome py to. create a Python program Click OK You will see a Python. program the file created under the pybook node in the. package explorer as shown in Figure 11,Browse to locate a Python interpreter. Enter a file name to create a Python program,The file is created in the package explorer.
Type the code from Listing 1 1 in the text as shown in. Python code is entered in the editor pane,8 Run a Python Program. Now you can run the program by right clicking on the file. Welcome py to display a context menu as shown in Figure. 13 Choose Run As Python Run to run the program The result. is displayed in the Console pane as shown in Figure 14. Run a Python program,The output is displayed in the Console pane. 9 Debug Python Programs, The Python debugger utility is integrated in Eclipse You. can pinpoint bugs in your program with the help of the. Eclipse debugger without leaving the IDE The Eclipse. debugger enables you to set breakpoints and execute programs. line by line As your program executes you can watch the. values stored in variables observe which methods are being. called and know what events have occurred in the program. To demonstrate debugging Let us use Listing 2 7, ComputeLoan py to demonstrate debugging Create a new. program named ShowCurrentTime py in the pybook project. 9 1 Setting Breakpoints, You can execute a program line by line to trace it but this.
is time consuming if you are debugging a large program. Often you know that some parts of the program work fine It. makes no sense to trace these parts when you only need to. trace the lines of code that are likely to have bugs In. cases of this kind you can use breakpoints, A breakpoint is a stop sign placed on a line of source code. that tells the debugger to pause when this line is. encountered The debugger executes every line until it. encounters a breakpoint so you can trace the part of the. program at the breakpoint Using the breakpoint you can. quickly move over the sections you know work correctly and. concentrate on the sections causing problems, There are several ways to set a breakpoint on a line One. quick way is to click the cutter of the line on which you. want to put a breakpoint You will see the line highlighted. as shown in Figure 15 You also can set breakpoints by. choosing Run Toggle Line Breakpoint To remove a,breakpoint simply click the cutter of the line. As you debug your program you can set as many breakpoints. as you want and can remove breakpoints at any time during. debugging The project retains the breakpoints you have set. when you exit the project The breakpoints are restored when. you reopen it,You can set breakpoints in the source code. 9 2 Starting the Debugger, There are several ways to start the debugger A simple way.
is shown below,1 Set a break point at the first statement in the. program in the Source Editor, 2 Right click on ComputeLoan py in the project pane to. display a context menu Choose Debug As Python Run,to start debugging You will first see the Confirm. Perspective Switch dialog as shown in Figure 16, Click Yes to switch to the Debug perspective The UI. for Debug perspective is shown in Figure 17, To start debug Eclipse needs to switch to the Debug.
perspective,The debugger starts to run ComputeLoan py. 9 3 Controlling Program Execution, The program pauses at the first line in the script This. line called the current execution point is highlighted in. green The execution point marks the next line of source. code to be executed by the debugger, When the program pauses at the execution point you can. issue debugging commands to control the execution of the. program You also can inspect or modify the values of. variables in the program, When Eclipse is in the debugging mode the toolbar buttons. for debugging are displayed in the Debug window as shown in. Figure 17 The toolbar button commands also appear in the. Run menu see Figure 18 Here are the commands for,controlling program execution.
Resume resumes the execution of a paused program,Suspend temporarily stops execution of a program. Terminate ends the current debugging session, Step Into executes a single statement or steps into a. Step Over executes a single statement If the statement. contains a call to a method the entire method is,executed without stepping through it. Step Return executes all the statements in the current. method and returns to its caller, Run to Line runs the program starting from the current. execution point and pauses and places the execution. point on the line of code containing the cursor or at. a breakpoint, The debugging commands appear under the Debug menu.


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