This lets you get all the keys in a weirdly nested json document. Very useful for working with mongodb. Works like variety.js but at the item-level.

listNkeys.py

def listNkeys(obj, prefix=''):
    """
    This lets you list ALL the keys of large nested dictionaries a la mongodb documents.
    from: http://stackoverflow.com/questions/17952981/return-a-list-of-all-variable-names-in-a-python-nested-dict-json-document-in-dot

    Usage:
    >>> x = {
            'a': 'meow',
            'b': {
                'c': 'asd'
            },
            'd': [
                {
                    "e": "stuff",
                    "f": 1
                },
                {
                    "e": "more stuff",
                    "f": 2
                }
                ],
            'g': ''
        }
    >>> list(listNkeys(x))
    ['a', 'b.c', 'd[0].e', 'd[0].f', 'd[1].e', 'd[1].f', 'g']
    >>> map(partial(getByDot,x),list(listNkeys(x)))
    ['meow', 'asd', 'stuff', 1, 'more stuff', 2, '']
    """
    if isinstance(obj, dict):
        if prefix: prefix += '.'
        for k, v in obj.items():
            for res in listNkeys(v, prefix+str(k)):
                yield res
    elif isinstance(obj, list):
        for i, v in enumerate(obj):
            for res in listNkeys(v, prefix+'['+str(i)+']'):
                yield res
    else:
        yield prefix