遍历列表

products=[[‘Iphone8’,6888],[‘MacPro’,14800],[‘Coffee’,31],[‘Book’,80],[‘Nike shoes’,799]]

#方法一：普通循环
for i in products:
n=products.index(i)
print(n,products[n][0],products[n][1])

#方法二：enumetare 将一个可遍历的序列组合成一个索引序列，同时列出数据下标
for index,i in enumerate(products):
print(index,i[0],i[1])

#格式化输出
for index,i in enumerate(products):
print("%d. %s %s"%(index,i[0],i[1]))