Python 3: Flattening nested dictionaries and lists within dictionaries

Question

I am dealing with a complex nested dictionary and list data structure. I need to flatten the data and bring all nested items to level 0. See below example for more clarity :

Answer 1

In my project, I am using an updated version of function from DSMs answer to flatten dict which may contain other dict or list or list of dict. I hope it will be helpful.

def flatten(input_dict, separator='_', prefix=''):
    output_dict = {}
    for key, value in input_dict.items():
        if isinstance(value, dict) and value:
            deeper = flatten(value, separator, prefix+key+separator)
            output_dict.update({key2: val2 for key2, val2 in deeper.items()})
        elif isinstance(value, list) and value:
            for index, sublist in enumerate(value, start=1):
                if isinstance(sublist, dict) and sublist:
                    deeper = flatten(sublist, separator, prefix+key+separator+str(index)+separator)
                    output_dict.update({key2: val2 for key2, val2 in deeper.items()})
                else:
                    output_dict[prefix+key+separator+str(index)] = value
        else:
            output_dict[prefix+key] = value
    return output_dict