Multidimensional Dictionaries: Possible?

[Stewart Wilson]

Skip Montanaro wrote:
> 
> If what you really want are nested dicts, then you should use something like
> 
>     >>> dict = {}
>     >>> dict[1] = {}
>     >>> dict[1][2] = 'foo'
>     >>> dict.keys()
>     [1]
>     >>> dict[1].keys()
>     [2]
> 

In addition, and to answer your original question on incrementing the
value, if your top level dictionary contains the first key, then you can
do:

dict["key1"]["key2"] = dict["key1"].get("key2",0) + 1

As in this example:

>>> dict = {}
>>> dict["key1"] = {}
>>> dict["key1"]["key2"] = dict["key1"].get("key2",0) + 1
>>> dict["key1"]["key2"]
1
>>> dict["key1"]["key2"] = dict["key1"].get("key2",0) + 1
>>> dict["key1"]["key2"]
2


---
Stewart Wilson
wilson at nortelnetworks.com