flatten_dict.py

def flatten_dict(in_, joiner="."):
    out = dict()
    retry = 0
    for item in in_:
        if type(in_[item]) == list:
            retry = 1
            for i,list_item in enumerate(in_[item]):
                out[f"{item}{joiner}{i}"] = in_[item][i]
        elif type(in_[item]) == dict:
            retry = 1
            for dict_item in in_[item]:
                out[f"{item}{joiner}{dict_item}"] = in_[item][dict_item]
        else:
            out[item] = in_[item]

    if retry:
        out=flatten_dict(out, joiner=joiner)
    return out