Python Dictionaries - University of Michigan
Python Dictionaries
Chapter 9
Python for Informatics: Exploring Information
Unless otherwise noted, the content of this course material is licensed under a Creative Commons Attribution 3.0 License. .
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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