enumerate 作用：新增一列，自动累加（类似表格中的自增列）,一般用于for循环中
例1：
dic = ["电脑","鼠标","内存","键盘"] for i,j in enumerate(dic,0): print(i,j) inp = input("请输入0-3：") inp2 = int(inp) res = dic[inp2] print("你选择的商品是: " + res)
运行效果：
例2：
dic = [{"name":"电脑","price":4500},{"name":"鼠标","price":35},{"name":"内存","price":200},{"name":"键盘","price":30}]
for i,j in enumerate(dic,0):
print(i,j["name"],j["price"])
inp = input("请输入0-3：")
inp2 = int(inp)
res = dic[inp2]["name"]
res1 = dic[inp2]["price"]
print("你选择的商品是: " + res + " 价格为：" +str(res1))
原文：https://www.cnblogs.com/junzhu2/p/9059962.html