1.7. Don’t Mix and Match Variables Types

It’s important to know that you can’t mix and match operations between different data types and that it doesn’t always make sense to apply mathematical operations to strings.

print("red" - "blue")

However, if you use the + operator, you’ll find that it actually concatenates (joins) the strings together.

print("red" + "blue")

This means that there is a difference between the number 3 and the string '3'.

Another slightly odd behaviour is that you can multiply a string with a number. This results in the string being repeated.

x = "red"
y = 3
print(x * y)

Question 1

What do you think the output of the following code will be?

x = 3
y = 4
print(x + y)

Solution

7

Question 2

What do you think the output of the following code will be?

x = '3'
y = '4'
print(x + y)

Solution

Solution is locked

Question 3

Which of the following code snippets will result in an error? Select all that apply.

1. x = '1'
   y = '2'
   print(x - y)
   

2. x = '1'
   y = '2'
   print(x + y)
   

3. x = '1'
   y = 2
   print(x + y)
   

4. x = 1
   y = 2
   print(x * y)
   

5. x = '1'
   y = 2
   print(x * y)
   

Solution

Solution is locked