Lecture 8: Lists and Mutability - GitHub Pages
Lecture 8: Lists and Mutability
Check-in and Reminders
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Reminder: Homework 3 out: pick up from the front
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How to approach homework questions:
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You can test out pieces of code in interactive python
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But the best way to learn is to walk through the logic of the code
using pencil and paper (without a machine)
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Homework are the best practice for exams!
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Lab 3 due tonight for Mon labs, tomorrow night for Tues
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Our office hours
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Today: Iris (12-1 pm), Me (12.30 - 2pm @ CS common room)
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Tomorrow: Iris (10 am-noon), Me (1-2 pm)
Do You Have Any Questions?
Fast Paced Course: Practice is Key!
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This is a very fast paced course
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To keep up, you must practice what we learn in lectures
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Learning a new language is all about immersing yourself in it
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Best way to learn French?
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Go live in France for a bit
Best way learn Python?
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Live in PythonWorld! Play with examples in interactive python
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Test out code we do in class on your own
Get ahead, stay ahead. Preparing for the lab by reviewing lectures
will make you more productive!
Do You Have Any Questions?
Review: Lists
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We have worked with lists as a sequence (ordered collection
of items)
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We know how to concatenate two lists with a +
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We know how to append an item to a list
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Lists, unlike strings, are a mutable sequence
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This means we can update them
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Add items to lists
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Delete items from lists
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Sort lists in place, etc
Today we will discuss lists in more detail and implications of
lists being mutable
Updating by Reassignment
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Update by direct assignment to a list index
Example.
myList[1] = 7
# reassign to an existing index
myList Before
myList After
[1, 2, 3, 4]
[1, 7, 3, 4]
................
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