列表 -- 常用方法

# len()方法：列表元素个数

abc = ["to","ad","dge","to","buy","be"]

num = len(abc)

print(num)

 

# count方法：计算某元素出现次数

abc = ["to","ad","dge","to","buy","be"]

num = abc.count("to")

print(num)

 

#extend方法：继承

a = [1,2,3]

b = [4,5,6]

a.extend(b)

print[a]

 

#index方法：查找元素所在位置

abc = ["to","ad","dge","to","buy","be"]

abc.index("dge")

 

#reverse方法：列表内容反转（该方法没有返回值）

abc = ["to","ad","dge","to","buy","be"]

 abc.reverse()

print(abc)

 

#sort方法：排序（当排序的内容不为数字时，默认按照ASK码先后进行排序）

abc = [3,5,1,6,8,2,9]

x.sort()

 

#enumerate方法：显示列表序号和列表内容

注：enumerate(列表元素，元素编号起始值)

Goods_list = [["iphoneX", 5800], ["mac book", 12000], ["coffee", 30], ["python book", 15], ["bike", 2000]]
for i , v in enumerate(Goods_list , 1):

　　print(i , v)