product=[["电视机",1999],["冰箱",5999],["空调",2999]]
for item in product:
print("商品:{},价格:{}".format(item[0],item[1]))
del product[1]
product.append(["洗衣机",3999])
print("修改后商品列表:",product)
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商品:电视机,价格:1999
商品:冰箱,价格:5999
商品:空调,价格:2999
修改后商品列表: [['电视机', 1999], ['空调', 2999], ['洗衣机', 3999]]