Instructables

How to install Python packages on Windows 7

Picture of How to install Python packages on Windows 7
For the complete and utter noob 
(put your new skills to the test over at my simpleTweet_01_python instructable.) 

You want to use Python on a Windows 7 machine but you don't know what you're doing. What you do know is that in order to go anywhere and do anything you've got to install packages. Or maybe you don't even know that yet. Take a look at the top of any Python code and you'll likely see a line like this: import thingamajig

In Python, as with Java and its derivatives, you're always importing some established code into your project. If you're new to Python, new to Command Prompt, and new to anything non-Windows, then you're going to need a hand with that first step.

The good news is: it's easy.
There is no bad news. 
 
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Step 1: Installing the Package

Picture of Installing the Package
windows7.jpg
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At the time of this draft, Python 2.7 is the stable install.
Download Python from http://www.python.org/ and install it at C:\Python27\
For users with 64-bit systems, the 32-bit version of all software is recommended. 

Open the Command Prompt
Goto your Start Menu. Start > All Programs > Accessories > Command Prompt

Type into the Command Prompt window:
set path=%path%;C:\Python27\
And hit enter.
You only need to do this once and never again. Read about it here: http://docs.python.org/tutorial/interpreter.html

Now we're ready to install a package. There's lots to chose from but we'll start here...

Download simplejson at http://pypi.python.org/pypi/simplejson
This is a simplejson-2.1.6.tar.gz file, which in Windows language means it is a strange and otherworldly kind of zip file.

To open the *tar.gz file, download PeaZip for Windows http://peazip.org/
Use PeaZip to extract (uncompress / unzip) simplejson-2.1.6.tar.gz into your Download directory.
You should end up with something similar to this: C:\Users\pdxNat\Downloads\simplejson-2.1.6\

Go back to your Command Prompt window or open a new one.
You'll need to change directories in the command line and here's how you do that (http://coweb.cc.gatech.edu/ice-gt/339 )

When you start, your command line should look something like this:
c:\Users\pdxNat>
You want to get into the simplejson-2.1.6 directory, so at the command prompt type this:
cd downloads\simplejson-2.1.6
or the complete path:
cd c:\Users\pdxNat\Downloads\simplejson-2.1.6
Your prompt will change from this
c:\Users\pdxNat>
to this
c:\Users\pdxNat\Downloads\simplejson-2.1.6>

Now for the fun part. Inside that simplejson directory there is a file called setup.py. We're going to install that into the Python universe. Type this into the Command Prompt :
python setup.py install

See all that stuff flying by? Forget about it. Open a Windows Explorer window (Start > All Programs > Accessories > Windows Explorer ) and go have a look inside the directory at C:\Python27\Lib\site-packages\
You'll see simplejson-2.1.6-py2.7.egg has been added to the directory.

Now open IDLE (Start > All Programs > Python 2.7 > IDLE (Python GUI)) and type the following:
>>> import simplejson
See all that nothing that happens? That's your sign of success. Congratulations.
You've just installed and imported your first package for Python on Windows 7.
Repeat as needed.

For more information
http://docs.python.org/tutorial/index.html
http://www.python-forum.org  

-Download a package
-Extract the package
-Open Command Prompt
-set path (1st time only)
-change directory to Download\package\
-type >python setup.py install
-smile
Davaa2 months ago

Thanks for info. I have some quesion .

How to install libnss3.so python to win7

about this can u explain to me ?

Beginners will find this very useful, but pip could also be used for an identical purpose. My instructable, has a small column on it -http://www.instructables.com/id/Plotly-with-Python/

70mhz5 months ago

Great instructions but when I try to install simplejson my virus checker tells me its a virus and deletes it. Can I progress without simplejson ??

crajendran11 months ago
Check your environment variables and add C:\python27 or C:\python33 if you have python 3 to the path
tzahra1 year ago
Please help when I type python setup.py.install i get the following error
'python' is not recognised as an internal or external ciommand operable command or batch file.

What should I do to get the package started? I am a new user and want to learn Python well.
yo9hnf1 year ago
It did work fine for my with Python 3.3 . Thank you PDXNAT !
smt21 year ago
Its not working in python 3.3....
The best tutorial for python on the web in my opinion. Thanks alot really got me started.
pdxnat (author)  SecEngineer1 year ago
Glad it helped! Python's a great format once you get it up and running.
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