Typing

[vlad-bezden]

On page 96 line

# Put a None at the beginning so output[1] is the output for 1
output = [None] + head(power_fizz(), 1000)

type checker gives following error:

Operator "+" not supported for types "list[None]" and "list[str]"

I suggest change it to

output = [""] + head(power_fizz(), 1000)