How to add a line with hyphens to a list?

Question

Python

Hello, I can’t add a list to the dictionary, how can I do it correctly?

This does not work, it says that the sign ":" is expected on the line first string

- a
- - b
  - - c
    - - d: | 
      first string
      second string
    - - e

And if you remove line breaks (I don’t know exactly what it’s called, then everything works

- a
- - b
  - - c
    - - d: "first string\nsecond string"
    - - e

Parsing the file itself using PyYaml.

Answer 1

- a
- - b
  - - c
    - - d: | 
          first string
          second string
    - - e