python: a way to get an exhaustive, sorted list of keys in a nested dictionary?

Posted by saidimu on Stack Overflow See other posts from Stack Overflow or by saidimu
Published on 2010-05-08T01:55:42Z Indexed on 2010/05/08 1:58 UTC
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exhaustive:
- all keys in the dictionary, even if the keys are in a nested dictionary that is a value to a previous-level dictionary key.

sorted:
- this is to ensure the keys are always returned in the same order

The nesting is arbitrarily deep. A non-recursive algorithm is preferred.

level1 = {
    'a'         : 'aaaa',
    'level2_1'  : {'b': 'bbbbb', 'level3': {'c': 'cccc', 'd': 'dddddd'}  },
    'level2_2'  : { 'z': 'zzzzzzz' }
}

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