very useful when working with information from erlang

pairs_tool.py

def is_pair(item):
    if isinstance(item, list):
        if len(item) == 2:
            if isinstance(item[0], str):  # and isinstance(item[1], list)
                return True
    return False


def is_pairs_list(item):
    if isinstance(item, list):
        if len(item) > 0:
            return all(map(is_pair, item))
    return False


def nested_dict2pairs(dicts):
    pairs = []
    for k, v in dicts.items():
        if isinstance(v, dict):
            pairs.append([k, nested_dict2pairs(v)])
        else:
            pairs.append([k, v])
    return pairs


def nested_pairs2dict(pairs):
    d = {}
    if is_pairs_list(pairs):
        for k, v in pairs:
            d[k] = nested_pairs2dict(v)
        return d
    elif is_pair(pairs):
        k, v = pairs
        d[k] = nested_pairs2dict(v)
        return d
    elif isinstance(pairs, dict):
        for k, v in pairs.items():
            d[k] = nested_pairs2dict(v)
        return d
    else:
        return pairs

if __name__ == "__main__":
  from pprint import pprint
  ex = ["rating", [["key_1", ["key_11", [["key_111", "val_111"], ["key_112", "val_112"], ["key_113", "val_113"]]]],
                     ["key_2", "value_2"], ["key_3", "value_3"]]]
  ex2 = {"rating": {"key2": {"key3": [1, 2, 3], "key4": "123"}, "key2_2": {"key3_1": [4, 5], "key3_2": []}}}
  
  # pprint(nested_pairs2dict(ex))
  # pprint(nested_dict2pairs(ex2))
  print(nested_pairs2dict(nested_dict2pairs(nested_pairs2dict(ex))) == nested_pairs2dict(ex))