Outline for November 5, 2020

Reading: §4, 9
Due: Homework 3, due November 13, 2020

1. Refactoring code (continued)
   1. Collapse similar statements: make the distance between 2 points a function [peri1.py]
   2. Collapse similar statements: make the prompts a function [peri2.py]
   3. Refactor for clarity only: make the perimeter computation a function [peri3.py]
   4. Add error checking: “peri0.py” done right [peri-c.py]

2. Dictionary
   1. Collection of key-value pairs

3. Creating dictionaries
   1. Using d = {}
   2. Using d = dict()

4. Methods for dictionaries
   1. k in D: True if dictionary D has key k; else False
   2. D.keys(): list of keys in D
   3. D.values(): list of values in D
   4. D.items(): list of tuples (key, value) in D
   5. D.get(k, d): if key k in D, return associated value; else return d
   6. del D[k]: delete tuple with key k from D
   7. D.clear(): delete all entries in D

5. Sorting the dictionary
   1. sorted sorts based on keys

6. Example: word frequency count
   1. Unsorted [wfc-1.py]

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: mabishop@ucdavis.edu

MHI 289I, Programming for Health Informatics Version of November 5, 2020 at 11:59PM

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