1. Review

2. Print Challenge Bruce asked, “When was the last time you had fish?”
Now try these:
Bruce asked, “When was the last time you had fish?”
He’s leading an FEA group.
FEA stands for “Fish Eater’s Anonymous.”

3. Printing variables
You can print the data that is stored within a variable by passing the variable as an argument into the print function
name = “Donald” name = “Donald”
print (name) print (“Hello, my name is”, name)
>> Donald >> Hello, my name is Donald

4. Changing variables
Variables are called variables because the data stored in them can be changed
You can change the value/data stored in a variable with a second assigning statement
dollars = 19.99
print (“I have”, dollars, “in my account”)
dollars =
print (“Now, I have”, dollars, “in my account”)

5. Multiple Assignments
You can assign multiple variables on the same line:
x, y, z = 1, 2, 3
# the variables will assume the values in order
You can also assign the same value to multiple variables
x = y = z = 10
# variables x, y, and z will all hold the value of 10

6. Practice
You’re working on a simple inventory management system for a small store. You’d like to store the name and price of two products and print them, so that your inventory page looks something like this:
Item: Bread, price: $ 1.99
Item: Eggs, price: $ 3.49

7. Let’s make our programs more interactive!
Input Function
Let’s make our programs more interactive!

8. Reading input from the user
So far, we have learned how to:
OUTPUT information (print function)
STORE information (variables)
Now, we will learn how to get INPUT from the user, via the keyboard

9. Input Function
You can make your programs interactive by asking the user to input some sort of information, using the input( ) function
Notice that again, this keyword has a set of parentheses for an argument
This means we CAN use the word input as a variable name

10. Input Function
input ( ) has the same function as print ( ) , in that, they output whatever argument is passed into the function
However, the input function only accepts one argument

11. Input Function
The program will wait for the user to enter a response and continue to run the program when the user hits ENTER (in other words, the input function will cause a pause in the execution of your program)
WARNING: You must store the data SOMEWHERE! (in a variable)

12. Input Function Example: username = input (“What is your username?: ” )
print (“Welcome,”, username, “!”)
>> What is your username?: Donald
>> Welcome, Donald !

13. Input function The input ( ) will always “return” a string
This means that its output will always be treated as a string, as well as when it is stored in a variable
price = input (“Give me a number:”)
new_price = price+ 2
print (new_price)

14. Input function The input ( ) will always “return” a string
This means that its output will always be treated as a string, as well as when it is stored in a variable
price = input (“Give me a number:”)
new_price = price # you are trying to add a string to an integer value
print (new_price)
# this will run an error because you added two values that were not the same type

15. Input function (Solution)
price = input (“Give me a number:”) new_price = price + “2” print (new_price) >> Give me a number: 43 >> 432

16. Let’s try it again
This time, using the input function, ask the user for the name and price of two products and print out a similar inventory for your store:
Item: bread, Price: $ 15.99
Item: orange juice, Price: $ 34.67

17. Programming Challenge
Write a program that allows the user to enter in their first name, and then their last name.
Then, greet the user with a welcome message.
First Name: Donald
Last Name: Seok
Welcome, Donald Seok !

18. Let’s have a little fun …
Name a place:
Another place
A verb:
A type of plant:
An object:
A color:
An adjective:
A type of weather:
A feeling:

19. Mad Lib Exercise