If the computer prints something out it will be formatted like this:
Hello, World!
(Note that printed text goes to your screen, and does not involve paper. Before computers had screens, the
output of computer programs would be printed on paper.)
Note that this is a Python 3 tutorial, which means that most of the examples will not work in Python 2.7 and
before. As well, some of the extra libraries (third-party libraries) have not yet been converted. You may want
to consider learning from the Non-Programmer's Tutorial for Python 2.6. However, the differences between
versions are not particularly large, so if you learn one, you should be able to read programs written for the
other without much difficulty.
There will often be a mixture of the text you type (which is shown in bold) and the text the program prints to
the screen, which would look like this:
Halt!
Who Goes there? Josh
You may pass, Josh
(Some of the tutorial has not been converted to this format. Since this is a wiki, you can convert it when you
find it.)
I will also introduce you to the terminology of programming - for example, that programming is often
referred to as coding or hacking. This will not only help you understand what programmers are talking
about, but also help the learning process.
Now, on to more important things. In order to program in Python you need the Python 3 software. If you
don't already have the Python software go to www.python.org/download (http://www.python.org/download/)
and get the proper version for your platform. Download it, read the instructions and get it installed.
Installing Python
For Python programming you need a working Python installation and a text editor. Python comes with its
own editor, IDLE, which is quite nice and totally sufficient for the beginning. As you get more into
programming, you will probably switch to some other editor like emacs, vi or another.
The Python download page is http://www.python.org/download. The most recent version is Python 3.4.3 (as
of February 2015); Python 2.7 and older versions will not work with this tutorial. There are various
different installation files for different computer platforms available on the download site. Here are some
specific instructions for the most common operating systems:
Linux, BSD, and Unix users
You are probably lucky and Python is already installed on your machine. To test it type python3 on a
command line. If you see something like what is shown in the following section, you are set.
IDLE may need to be installed separately, from its own package such as idle3 or as part of python-tools.
If you have to install Python, first try to use the operating system's package manager or go to the repository
where your packages are available and get Python 3. Python 3.0 was released in December 2008; all
distributions should have Python 3 available, so you may not need to compile it from scratch. Ubuntu and
Fedora do have Python 3 binary packages available, but they are not yet the default, so they need to be
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