cute python function to tell if one dict is a subset of another that took me way too long to write

dict_subset.py

def dict_subset(d1, d2):
    """Return true if d2 is contained within d1."""
    if type(d1) is not dict or type(d2) is not dict:
        return False
    res = []
    for key, val in d2.items():
        if key in d1.keys():
            if type(val) is dict:
                res.append(dict_subset(d1[key], val))
            elif val != d1[key]:
                return False
        else:
            return False
    return all(res)