4.4 Input and Formatting Output

3 practice questionsNot yet reviewed

Notes

The input() function reads what the user types. It always returns a string, so convert it to a number when you need math.

age = int(input("Age? "))
print("Next year you will be", age + 1)

If the user types 14, the program prints Next year you will be 15.
Without int(), age + 1 would cause an error, because you cannot add a string and an integer.
An f-string puts values inside text: f"Hello, {name}!".
Example: with name = "Sam", print(f"Hi {name}") shows Hi Sam.

What type of value does input() return?

input() always gives a string, even if the user types digits.

A user types 8 when running n = input("n? "); print(n * 2). What is printed?

n is the string "8", and "8" * 2 repeats it to give "88".

With item = "pen" and cost = 3, what does print(f"{item} costs {cost + 1}") show?

The f-string replaces {item} with pen and evaluates cost + 1 as 4.