How to flatten nested python dictionaries?

Question

I\'m trying to flatten the nested dictionary:

dict1 = {
    \'Bob\': {
        \'shepherd\': [4, 6, 3],
        \'collie\': [23, 3, 45],
        \'poodle\':          


        

Answer 1

I started with @DaewonLee's code and extended it to more data types and to recurse within lists:

def flatten(d):
    res = []  # type:list  # Result list
    if isinstance(d, dict):
        for key, val in d.items():
            res.extend(flatten(val))
    elif isinstance(d, list):
        for val in d:
            res.extend(flatten(val))
    elif isinstance(d, float):
        res = [d]  # type: List[float]
    elif isinstance(d, str):
        res = [d]  # type: List[str]
    elif isinstance(d, int):
        res = [d]  # type: List[int]
    else:
        raise TypeError("Undefined type for flatten: %s" % type(d))
    return res