Help Parsing JSON

[buran]

don't use json as name, it's a built-in module and you don't want to override it

data = {
    "12345": {
        "2021-01-20": {
            "a": 1,
            "b": 3,
            "c": 0
        },
        "2021-01-21": {
            "a": 1,
            "b": 3,
            "c": 0
        }
    },
    "12346": {
        "2021-01-20": {
            "a": 1,
            "b": 3,
            "c": 0
        },
        "2021-01-21": {
            "a": 1,
            "b": 3,
            "c": 0
        }
    }
}

for product, dates in data.items():
    for adate, values in dates.items():
        print(f"{product},{adate},{values['a']},{values['b']},{values['c']}")

Output:
12345,2021-01-20,1,3,0
12345,2021-01-21,1,3,0
12346,2021-01-20,1,3,0
12346,2021-01-21,1,3,0