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Compsci 101.2, Fall 2015 21.1 Plan for 11/9 and 11/11 l Reviewing Concepts for test  Loops: index and by element  Strings, Lists, Sets, Dictionaries.

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Presentation on theme: "Compsci 101.2, Fall 2015 21.1 Plan for 11/9 and 11/11 l Reviewing Concepts for test  Loops: index and by element  Strings, Lists, Sets, Dictionaries."— Presentation transcript:

1 Compsci 101.2, Fall 2015 21.1 Plan for 11/9 and 11/11 l Reviewing Concepts for test  Loops: index and by element  Strings, Lists, Sets, Dictionaries  List Comprehensions l Lab and assignment concepts  While loops, Global Variables, Computer-aided Game Play  Image processing, RGB, simulation/random, CSV files

2 Compsci 101.2, Fall 2015 21.2 Reminder of APT quiz l How to solve it: APT Quiz style  Looking at problems from last time  Goals in time-driven APT-solving l CountUp  Ideas l Maker  Ideas l Anonymous

3 Compsci 101.2, Fall 2015 21.3 Looping by index or by element l Strings and lists: use either  range(len(x)) for index, can get element l Sets and Dictionaries: element only  Loop over d or d.keys() for dictionary  The keys are a set, so similar to set loop l Which is best when choice? It depends!  Can you get element from index?  Can you get index from element?

4 Compsci 101.2, Fall 2015 21.4 Questions http://bit.ly/101fall15-nov10-1

5 Compsci 101.2, Fall 2015 21.5 Unpacking a list comprehension [f(x) for x in foo if condition with x] [w for w in words if w.endswith('e')] [(w,words.count(w)) for w in set(words)]  Always possible to use a loop build = [] for x in foo: if condition with x: build.append(f(x)) build = [] for w in set(words): build.append((w,words.count(w)))

6 Compsci 101.2, Fall 2015 21.6 Set Concepts l Set union, intersection, difference  s.intersection(t) is the same as s&t  s.union(t) is the same as s|t  s.difference(t) is the same as s-t l Sets aren't in order during iteration  Convert to list, create from list  Sets are really, really efficient for add/search

7 Compsci 101.2, Fall 2015 21.7 Questions http://bit.ly/101fall15-nov10-2

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