We call words like "bob" or numbers like 3 data

The following code doesn't work, but it looks like it should. What error does it return?

The error is: NameError: name 'bob' is not defined on line 1

What happens here is that Python thinks there should be a variable called bob and that bob should be replaced with the value assigned to bob. However, there is no such variable.

We want use the literal value bob as data, not as code.

To tell the computer that the word bob is data, we wrap it in quotes, like this.

We call letters and words wrapped in quotes a string.