Display values from a deeply nested dict in python

dicty.py

def dicty(d, key=None):
    """removes empty string and None values from a nested dict, if key, then prints all values within the dict"""
    if key:
        for k, v in d.items():
            if k.lower() == key.lower():
                print "{}: {}".format(k, v)
            if isinstance(v, dict):
                dicty(v, key)
            if isinstance(v, list):
                for x in v:
                    if isinstance(x, dict):
                        dicty(x, key)
    else:
        temp_d = {}
        for k, v in d.items():
            if v is None or (isinstance(v, basestring) and not v.strip()):
                continue
            elif isinstance(v, dict):
                temp_nested_d = dicty(v)
                if temp_nested_d:
                    temp_d[k] = temp_nested_d
            else:
                temp_d[k] = v
        return temp_d
                
                        

Usage:

>>> d = {'a': 0, 'b': {'hello': None}, 'c': ['a', {'d': None, 'stage': 'IN_PROGRESS'}, {'stage': 'DONE'}]}
>>> dicty(d)
{'a': 0, 'c': ['a', {'d': None, 'e': 0}, {'e': 1}]}
>>> dicty(d, 'stage')
stage: IN_PROGRESS
stage: DONE