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This page explains how to set up Python on a machine so you can run and edit Python programs, and links to the exercise code to download. You can do this before starting the class, or you can leave it until you've gotten far enough in the class that you want to write some code. The Google Python Class uses a simple, standard Python installation, although more complex strategies are possible.
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Python is free and open source, available for all operating systems from. In particular we want a Python install where you can do two things: • Run an existing python program, such as hello.py • Run the Python interpreter interactively, so you can type code right at it Both of the above are done quite a lot in the lecture videos, and it's definitely something you need to be able to do to solve the exercises. Download Google Python Exercises As a first step, download the file and unzip it someplace where you can work on it. The resulting google-python-exercises directory contains many different python code exercises you can work on. In particular, google-python-exercises contains a simple hello.py file you can use in the next step to check that Python is working on your machine. Below are Python instructions for Windows and all other operation systems: Python on Linux, Mac OS X, and other OS Most operating systems other than Windows already have Python installed by default.
To check that Python is installed, open a command line (typically by running the 'Terminal' program), and cd to the google-python-exercises directory. Try the following to run the hello.py program (what you type is shown in bold): ~/google-python-exercises$ python hello.py Hello World ~/google-python-exercises$ python hello.py Alice Hello Alice If python is not installed, see the page. To run the Python interpreter interactively, just type python in the terminal: ~/google-python-exercises$ python Python 2.5.2 (r252:60911, Feb 22 2008, 07:57:53) [GCC 4.0.1 (Apple Computer, Inc. Build 5363)] on darwin Type 'help', 'copyright', 'credits' or 'license' for more information. >>> 1 + 1 2 >>> you can type expressions here.
After a few seconds (up to a few minutes), the drive will appear in your 'My Computer'. • The drive should now turn on.
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Use ctrl-d to exit For Google's Python Class, it's best to use Python 2.7. Although Python 3.x is becoming more popular, this course is designed for Python 2.6 or later. Execute Bit (optional) The commands above are the simplest way to run python programs. If the 'execute bit' is set on a.py file, it can be run by name without having to type python first. Set the execute bit with the chmod command like this: ~/google-python-exercises$ chmod +x hello.py ~/google-python-exercises$./hello.py ## now can run it as./hello.py Hello World Python on Windows To install Python on Windows, go to the page and download Python 2.7.x. Run the Python installer and accept all the defaults.
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This will install Python in the root directory and set up some file associations. With Python installed, open a command prompt (Accessories > Command Prompt, or type cmd into the run dialog). Cd to the google-python-exercises directory (from unzipping google-python-exercises.zip). You should be able to run the hello.py python program by typing python hello.py (what you type is shown in bold): C: google-python-exercises> python hello.py Hello World C: google-python-exercises> python hello.py Alice Hello Alice If this works, Python is installed. Otherwise, see for help.
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To run the Python interpreter interactively, select the Run. Command from the Start menu, and type Python -- this will launch Python interactively in its own window. On Windows, use Ctrl-Z to exit (on all other operating systems it's Ctrl-D to exit). In the lecture videos, we generally run the Python programs with commands like./hello.py. On Windows, it's simplest to use the python hello.py form. Editing Python (all operating systems) A Python program is just a text file that you edit directly. As above, you should have a command line open, where you can type python hello.py Alice to run whatever exercise you are working on.
At the command line prompt, just hit the up-arrow key to recall previously typed commands, so it's easy to run previous commands without retyping them. You want a text editor with a little understanding of code and indentation. There are many good free ones: • Windows -- do not use Notepad or Wordpad. Try the free and open source or the free and open source • Mac -- The built in TextEdit works, but not very well.