Python Dictionaries - University of Michigan
Python Dictionaries
Chapter 9
Python for Informatics: Exploring Information
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.
Copyright 2010- Charles Severance
What is a Collection?
?
A collection is nice because we can put more than one value in them
and carry them all around in one convenient package.
?
?
?
We have a bunch of values in a single ¡°variable¡±
We do this by having more than one place ¡°in¡± the variable.
We have ways of finding the different places in the variable
What is not a ¡°Collection¡±
?
Most of our variables have one value in them - when we put a new
value in the variable - the old value is over written
$ python
Python 2.5.2 (r252:60911, Feb 22 2008, 07:57:53)
[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
>>> x = 2
>>> x = 4
>>> print x
4
A Story of Two Collections..
?
List
?
?
A linear collection of values that stay in order
Dictionary
?
A ¡°bag¡± of values, each with its own label
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