import itertools
import collections
def is_non_string_sequence(seq):
    return isinstance(seq, collections.Sequence) and not isinstance(seq, basestring)
def is_dict(d):
    return isinstance(d, collections.Mapping) or hasattr(d, 'iteritems') and not isinstance(d, basestring)
def iterable_paths(o, level=0):
    if is_dict(o):
        seqs = []
        for k, v in o.iteritems():
            newseqs = iterable_paths(v, level=level+1)
            for newseq in newseqs:
                seqs.append([k])
                seqs[-1].extend(newseq)
    elif is_non_string_sequence(o):
        seqs = [[]]
        for item in o:
            if not is_dict(item) and not is_non_string_sequence(item):
                seqs[-1].append(item)
            else:
                newseqs = iterable_paths(item, level=level+1)
                for newseq in newseqs:
                    for s in seqs:
                        s.extend(newseq)
        
    else:
        seqs = [[o]]
    return seqs


def test_iterable_paths():
    data = {'i think i will': {'not consider': {'refactoring': 'this'},
      'test': {'a': 'value', 'a':['list','ofthings', {'including':{'nesting':'vals'}}]}},
     'testing': {'Nones': None, 'emptystrings': ''}}
    expected = [['testing', 'emptystrings', ''],
             ['testing', 'Nones', None],
             ['i think i will',
              'test',
              'a',
              'list',
              'ofthings',
              'including',
              'nesting',
              'vals'],
             ['i think i will', 'not consider', 'refactoring', 'this']]
    vals = iterable_paths(data)
    assert expected == vals
test_iterable_paths()