Error in the Control Structures -> List lecture

Question

This is the code of the section 3/4. Here I believe number has to be either in single or double quotes in order to be a string:
number = 3
things = ["string", 0, [1, 2, number], 4.56]
print(things[1])
print(things[2])
print(things[2][2])
and this is the output in the lecture which is wrong:
>>>
0
[1, 2, 3]
3
>>>
I think it has to be:
>>>
0
[1, 2, "number"]
number
>>>

Answer 1

The value of number (as a variable) was inserted, not the string 'number', hence, things contain
["string", 0, [1, 2, 3], 4.56]
The output of things[2] would be [1, 2, 3]

Answer 2

yes, you are right, I didn't notice the name of the first variable, that's why there aren't quotes there