splitting one dictionary into two

[Raymond Hettinger]

[jsaul]
> I have to split a dict into two dicts. Depending on their values,
> the items shall remain in the original dict or be moved to another
> one and at the same time be removed from the original dict.
> 
> OK, this is how I do it right now:
> 
>     dict1 = { "a":1, "b":3, "c":5, "d":4, "e":2 }
>     dict2 = {}
>     klist = []
> 
>     for key in dict1:
>         if dict1[key] > 3: # some criterion
>             dict2[key] = dict1[key]
>             klist.append(key)
> 
>     for key in klist:
>         del dict1[key]
> 
>     print dict1
>     print dict2
> 
> That means that I store the keys of the items to be removed from
> the original dict in a list (klist) and subsequently remove the
> items using these keys.
> 
> Is there an "even more pythonic" way?

Your way seems clean enough to me.

One other approach is to use items() so you can modify dict1 as you go:

    for key, value in dict1.items():
        if value > 3:
            dict2[key] = value
            del dict1[key]



Raymond Hettinger