Programming Notes Pt. 1

What is the purpose of variables

To store values for later use

What are expressions? Provide an example

Code that yields a value when evaluated (20\*40, yields 800)

Comments

Helpful way to explain code to a reader

The value of a variable can be printed out via:

print(variable_name)

Reading input is achieved using the

input() function

A programmer can combine input() and int() to read in a string from the user and then convert that string to an integer by inputting

int(input())

strings

a sequence

What function can be used to find the length of a string ( and any other sequence type)

len()

How do we access substrings?

Use the Square brackets for slicing along with the index to obtain your substring

Ex: var1 = ‘Hello World!’

var2=”Python Programming”

print( “var1\[0\]:" , var1\[0\]

Python strings are “immutable” meaning

They cannot be changed after they are created