Hi, I'm learning python and full of extensive tutorials around. Getting a bit 
lost and overflowed in my head with tuples, dictionaries, lists, etc ... etc... 
Everything great, but I'd like to perform some basic task while learning the 
rest. For example, I'm having a hard time to find some practical info to get me 
up to speed. E.g. doing the following list of tasks:

- read a file named 'data.dat' (let's suppose it has 13 columns and n lines) 
and read column 3 and 4

-plot column 3 vs column 4

-write a file 'outcome.txt' which has column 3 and 4

How do I do read and write of files? Is there some extra library I need for 
doing plots? I have read about  matplotlib.pyplot. How can I do the plot above 
using this library? (running python3.5 in OSX).

Thanks!
J.
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