Hence, the choice of an editor is crucial indeed. A good programmer's editor will make your life easier in writing the source files. To create our Python source files, we need an editor software where you can type and save. We cannot type out our program at the interpreter prompt every time we want to run something, so we have to save them in files and can run our programs any number of times. If you are using the Windows command prompt, press followed by the key. If you are using a GNU/Linux or OS X shell, you can exit the interpreter prompt by pressing or entering exit() (note: remember to include the parentheses, ()) followed by the key. Here, we are supplying the text Hello World and this is promptly printed to the screen. We use print to (unsurprisingly) print any value that you supply to it. Notice that Python gives you the output of the line immediately! What you just entered is a single Python statement.

Type 'help', 'copyright', 'credits' or 'license' for more information. from > onwards) should be the same regardless of the operating system. The details about the Python software will differ based on your computer, but the part from the prompt (i.e. Here is an example of what you should be seeing, when using a Mac OS X computer. You should see the words Hello World printed to the screen.

This is called the Python interpreter prompt.Īt the Python interpreter prompt, type: print( 'Hello World')įollowed by the key. Once you have started Python, you should see > where you can start typing stuff. Open the terminal in your operating system (as discussed previously in the Installation chapter) and then open the Python prompt by typing python3 and pressing key. We will now see how to use both of these methods. There are two ways of using Python to run your program - using the interactive interpreter prompt or using a source file. This will teach you how to write, save and run Python programs. We will now see how to run a traditional 'Hello World' program in Python.

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