Flattener from Nested Dict to 1d-dict

gistfile1.py

def flat(d):
    res = []
    for k,v in d.items():
        if isinstance(v, dict):
            res.extend([('.'.join([k,ck]), cv) for ck, cv in flat(v).items()])
        else:
            res.append((k,v))
    return dict(res)


> print flat(dict(a=123, b=dict(c=1,d=dict(e='h',f='g',g='j'))))
{'a': 123, 'b.c': 1, 'b.d.g': 'j', 'b.d.f': 'g', 'b.d.e': 'h'}