Someone

def generator_n(start,end,step):    start,end,step = int(start),int(end),int(step)    for i in xrange(start,end,step):        yield {"n" : "n_%d" % i}        def generator_change(start,end,step):    start,end,step = int(start),int(end),int(step)    for i in xrange(start,end,step):        yield {"change" : "change_%d" % i}def generator_date(start,end,step):    start,end,step = int(start),int(end),int(step)    for i in xrange(start,end,step):        yield {"date" : "date_%d" % i}