flat vs nested

foo.py

nested_representation = {
    5: {
        "0-100": {
            12: {
                "new": 0.123,
                "old": 0.321,
            },
            24: {
                "new": 0.1234,
                "old": 0.4321,
            }
        },
        "100-200": {
            12: {
                "new": 0.0123,
                "old": 0.3210,
            },
            24: {
                "new": 0.01234,
                "old": 0.43210,
            }
        },
    },    
    10: {
        "0-100": {
            12: {
                "new": 0.00123,
                "old": 0.32100,
            },
            24: {
                "new": 0.001234,
                "old": 0.432100,
            }
        },
        "100-200": {
            12: {
                "new": 0.000123,
                "old": 0.321000,
            },
            24: {
                "new": 0.0001234,
                "old": 0.4321000,
            }
        },
    },
}
flat_representation = [
    5, "0-100", 12, "new", 0.123,
    5, "0-100", 12, "old", 0.321,
    5, "0-100", 24, "new", 0.1234,
    5, "0-100", 24, "old", 0.4321,
    5, "100-200", 12, "new", 0.0123,
    5, "100-200", 12, "old", 0.3210,
    5, "100-200", 24, "new", 0.01234,
    5, "100-200", 24, "old", 0.43210,
    10, "0-100", 12, "new", 0.00123,
    10, "0-100", 12, "old", 0.32100,
    10, "0-100", 24, "new", 0.001234,
    10, "0-100", 24, "old", 0.432100,
    10, "100-200", 12, "new", 0.000123,
    10, "100-200", 12, "old", 0.321000,
    10, "100-200", 24, "new", 0.0001234,
    10, "100-200", 24, "old", 0.4321000,
]