dictionary get for nested dictionary

dict_get.py

>>>
>>> d = {
... 'key1' : {
...     'value': "parent-key1",
...     'subkey1': {
...         'value': "child1"
...     },
...     'subkey2': {
...         'value': "child2"
...     }
... },
... 'key2': {
...     'value': "parent-key2",
...     'subkey1': {
...         'value': "child3"
...     },
...     'subkey2': {
...         'value': "child4"
...     }
... }}
>>>
>>> def get_value(key, subkey):
...     dkey = d.get(key)
...     return dkey.get(subkey, {}).get('value', dkey.get('value'))
...
>>> print get_value("key1", "subkey1")
child1
>>> print get_value("key2", "subkey2")
child4
>>> print get_value("key2", "subkey3")
parent-key2
>>>