Python dict deepen

deepen.py

def deepen(shallow_obj):
    """Recursively deepens a dictionary based on keys"""
    shallow_copy = copy.copy(shallow_obj)
    deep_obj = {}
    for key in shallow_copy:
        if isinstance(shallow_copy[key], dict):
            shallow_copy[key] = deepen(shallow_copy[key])

        t = deep_obj
        parts = key.split('.')
        n_key = parts.pop()
        while parts:
            part, parts = parts[0], parts[1:]
            t[part] = t.get(part, {})
            t = t[part]
        t[n_key] = shallow_copy[key]
    return deep_obj

Takes properties in

{
    "a.b.c": "taco",
    "a.d": "burrito"
}

and converts it to

{
    "a": {
        "b": {
            "c": "taco"
        },
        "d": "burrito"
    }
}