Normalize nested Json into Flat dict structure

helpers.py

def json_flat(item, nest=''):
    new = {}
    for k,v in item.iteritems():
        key = '%s_%s' % (nest, k) if nest else k
        if isinstance(v, dict):
            new.update(json_flat(v, k))
        else:
            new[key] = v
    return new