YAML. Complex Structure

YAML. Complex Structure

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The 4th task in the series of missions about the YAML format will be devoted to a complex structure.

YAML Python/TypeScript

A list element can be another list.

        - Alex
        -
          - odessa
          - dnipro
        - Li
      
        [
          "Alex", 
          [
            "odessa", 
            "dnipro"
          ], 
          "Li"
        ]
        

A dictionary can also be an element of an list.

        - 67
        -
          name: Irv
          game: Mario
        -
        - 56
      
        [
          67, 
          {
            "game": "Mario", 
            "name": "Irv"
          }, 
          None/null, 
          56
        ]
      

A dictionary element can be another dictionary.

        name: Alex
        study:
          type: school
          number: 78
        age: 14
      
        {
          "age": 14, 
          "study": {
            "type": "school", 
            "number": 78
          }, 
          "name": "Alex"
        }
      

A list can also be an element of dictionary.

        name: Alex
        study:
          - 89
          - 89
          - "Hell"
        age: 14
      
        {
          "age": 14, 
          "study": [
            89, 
            89, 
            "Hell"
          ], 
          "name": "Alex"
        }
      

And, of course, data can have more than one nesting level.

        name: Alex
        study:
          -
            type: school
            num: 89
          -
            type: school
            num: 12
        age: 14
      
        {
          "age": 14, 
          "study": [
            {
              "num": 89, 
              "type": "school"
            }, 
            {
              "num": 12, 
              "type": "school"
            }
          ], 
          "name": "Alex"
        }
      

Input: Format string.

Output: An object (list/dictionary).

Examples:

assert yaml("- Alex\n-\n  - odessa\n  - dnipro\n- Li") == [
    "Alex",
    ["odessa", "dnipro"],
    "Li",
]
assert yaml("- 67\n-\n  name: Irv\n  game: Mario\n-\n- 56") == [
    67,
    {"game": "Mario", "name": "Irv"},
    None,
    56,
]
assert yaml("name: Alex\nstudy:\n  type: school\n  number: 78\nage: 14") == {
    "age": 14,
    "study": {"type": "school", "number": 78},
    "name": "Alex",
}
assert yaml('name: Alex\nstudy:\n  - 89\n  - 89\n  - "Hell"\nage: 14') == {
    "age": 14,
    "study": [89, 89, "Hell"],
    "name": "Alex",
}

Precondition: The YAML 1.2 standard is being used.

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