大批量删除列表中元素的方法，自己用本办法做的

var_c = ["GiftCnt36","GiftCntAll","GiftCntCard36","GiftCntCardAll","GiftTimeLast",
         "GiftTimeFirst","PromCnt12","PromCnt36","PromCntAll","PromCntCard12",
         "PromCntCard36","PromCntCardAll","StatusCatStarAll","DemAge",
         "DemMedHomeValue","DemPctVeterans","DemMedIncome","GiftAvgLast",
         "GiftAvg36","GiftAvgAll","GiftAvgCard36"]
del_list=['PromCnt12','PromCnt36','PromCntCard12','DemAge','DemPctVeterans','DemMedIncome']
var_c_s = var_c.copy()
for i in del_list:
    var_c_s.remove(i)

var_c_s = set(var_c) - set(['PromCnt12','PromCnt36',
                            'PromCntCard12','DemAge',
                            'DemPctVeterans','DemMedIncome'])
var_c_s = list(var_c_s)