Python flatten ordereddict

from collections import OrderedDict


def flatten_dict_keep_lists(data):
    flat = {}

    def _flatten(obj, parent_key=''):
        if isinstance(obj, (dict, OrderedDict)):
            for k, v in obj.items():
                key = k.split(':')[-1] if ':' in k else k
                _flatten(v, key)
        elif isinstance(obj, list):
            # If it's a list of dicts, flatten each item
            if all(isinstance(i, (dict, OrderedDict)) for i in obj):
                flat[parent_key] = [
                    flatten_dict_keep_lists(i) for i in obj
                ]
            else:
                # List of values, store as is
                flat[parent_key] = obj
        else:
            flat[parent_key] = obj

    _flatten(data)
    return flat