An Intro to
Programming
with Python

Fall 2006

course

navigation

nov 1

Dictionaries

 person = { 'name' : 'Jim',
            'age'  : 47,
            'hair' : 'black',
 }   
 
 print person['name']

Like an array, but we use strings rather than numbers.

unordered
The parts are called keys and values.

 'key' : 'value'

key is always a string
value can be anything - a list, an object, a number, ...
Extremely powerful way to save arbitrary sorts of data.

Discuss

interating over a dictionary
accessing a key that hasn't been defined yet
using dictionaries to count things
compare and contrast dictionary with class
example: building a tree out of nodes

In class

write a program to find word frequencies in Moby Dick
Google 'gutenberg moby dick'

http://cs.marlboro.edu/ courses/ fall2006/python/ notes/ nov_1
last modified Wednesday November 1 2006 11:24 am EST

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