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This chapter provides enough information to get you started writing Python programs We strongly recommend that you install Python if you have not already done so, so that you can get hands-on experience to reinforce what you learn here (The Introduction explains how to obtain and install Python on all major platforms; 4 ) This chapter s rst section shows you how to create and execute Python programs You can use your favorite plain text editor to write your Python code, but the IDLE programming environment discussed in this section provides not only a code editor, but also additional functionality, including facilities for experimenting with Python code, and for debugging Python programs The second section presents eight key pieces of Python that on their own are suf cient to write useful programs These pieces are all covered fully in later chapters, and as the book progresses they are supplemented by all of the rest of Python so that by the end of the book, you will have covered the whole language and will be able to use all that it offers in your programs The chapter s nal section introduces two short programs which use the subset of Python features introduced in the second section so that you can get an immediate taste of Python programming

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Python code can be written using any plain text editor that can load and save text using either the ASCII or the UTF-8 Unicode character encoding By default, Python les are assumed to use the UTF-8 character encoding, a superset of ASCII that can represent pretty well every character in every language Python les normally have an extension of py, although on some Unix-like sys9

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[ Team LiB ]

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tems (eg, Linux and Mac OS X) some Python applications have no extension, and Python GUI (Graphical User Interface) programs usually have an extension of pyw, particularly on Windows and Mac OS X In this book we always use an extension of py for Python console programs and Python modules, and pyw for GUI programs All the examples presented in this book run unchanged on all platforms that have Python 3 available Just to make sure that everything is set up correctly, and to show the classical rst example, create a le called hellopy in a plain text editor (Windows Notepad is ne we ll use a better editor shortly), with the following contents:

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#!/usr/bin/env python3 print("Hello", "World!")

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[ Team LiB ]

The rst line is a comment In Python, comments begin with a # and continue to the end of the line (We will explain the rather cryptic comment in a moment) The second line is blank outside quoted strings, Python ignores blank lines, but they are often useful to humans to break up large blocks of code to make them easier to read The third line is Python code Here, the print() function is called with two arguments, each of type str (string; ie, a sequence of characters) Each statement encountered in a py le is executed in turn, starting with the rst one and progressing line by line This is different from some other languages, for example, C++ and Java, which have a particular function or method with a special name where they start from The ow of control can of course be diverted as we will see when we discuss Python s control structures in the next section We will assume that Windows users keep their Python code in the C:\py3eg directory and that Unix (ie, Unix, Linux, and Mac OS X) users keep their code in the $HOME/py3eg directory Save hellopy into the py3eg directory and close the text editor Now that we have a program, we can run it Python programs are executed by the Python interpreter, and normally this is done inside a console window On Windows the console is called Console , or DOS Prompt , or MS-DOS Prompt , or something similar, and is usually available from Start All Programs Accessories On Mac OS X the console is provided by the Terminalapp program (located in Applications/Utilities by default), available using Finder, and on other Unixes, we can use an xterm or the console provided by the windowing environment, for example, konsole or gnome-terminal Start up a console, and on Windows enter the following commands (which assume that Python is installed in the default location) the console s output is shown in lightface; what you type is shown in bold:.

Binding derived from the with additional support for the latest WS-* speci cations based on standards available in 2007

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