Lists

Lists

Chris Piech and Mehran Sahami

CS106A, Stanford University

Piech + Sahami, CS106A, Stanford University

The Python Console

? Can run Python interactively using the "console"

�C In PyCharm click "Python Console" tab at bottom of window

�C In Terminal, run Python (e.g., typing "py" or "python3" or

"python", depending on your platform) to get console

? Console has prompt: >>>

�C Can type and execute Python statements (and see results)

�C Example:

>>> x = 5

>>> x

5

�C Easy way to try things out to answer questions you may have

�C Use exit() to leave console

Piech + Sahami, CS106A, Stanford University

Let��s Take the Console

Out For a Spin��

Piech + Sahami, CS106A, Stanford University

And Then There Were None

? The term None is used in Python to describe "no value"

�C For example, it is the value you would get from a function

that doesn't return anything

�C WHAT?!

�C Example:

>>> x = print("hi")

>>> print(x)

None

�C Comparing anything to None (except None) is False

? Why does None exist?

�C Denotes when the suitcase for a variable has "nothing" in it

Piech + Sahami, CS106A, Stanford University

Learning Goals

1. Learning about lists in Python

2. Writing code to use lists

3. Understand how lists work as parameters

Piech + Sahami, CS106A, Stanford University

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