Wells wrote:
> Why can't I do this?
>
> teams = { "SEA": "Seattle Mariners" }
> for team, name in teams.items():
> teams[team]["roster"] = ["player1", "player2"]
>
> I get an error:
>
> Traceback (most recent call last):
> File "./gamelogs.py", line 53, in <module>
> teams[team]["roster"] = ["player1", "player2"]
> TypeError: 'str' object does not support item assignment
>
> You can see that I am trying to make a key called "roster" for each
> team item in the dictionary, which is a list of players.
This is not a list as key, it's a nested dictionary. There are several
approaches to this:
- make your keys tuples, like this:
>>> teams[(team, "roster") = [...]
- use setedfault:
>>> teams.setdefault(team, {})["roster"] = ['player1']
- defaultdict
>>> from collections import *
>>> defaultdict
<type 'collections.defaultdict'>
>>> teams = defaultdict(dict)
>>> teams["team"]["roster"] = ["player1"]
>>> teams
defaultdict(<type 'dict'>, {'team': {'roster': ['player1']}})
>>>
Diez
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