[{"1":"1", "2":"2", "3":"3"}, {"1":"4", "2":"5", "3":"6"}...]

data = [{"1":"1", "2":"2", "3":"3"}, {"1":"4", "2":"5", "3":"6"}, ...]

data = [{k: v for k, v in i.items() if k != '2'} for i in data]

data = [{"1":"1", "2":"2", "3":"3"}, {"1":"4", "2":"5", "3":"6"}, {}, ]
for d in data: d.pop('2', '')