1、追加,追加元素在原列表末尾
li = [1,2,3]
li.append(4)
print(li)
li = [1,2,3,4]
2、清空
li = [1,2,3]
li.clear()
print(li)
li = []
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3、拷贝(浅拷贝)
li = [1,2,3]
v = li.copy()
print(v)
v = [1,2,3]
4、查询元素在列表中出现的次数
li = [1,2,3]
v = li.count(2)
print(v)
v = 1
5、扩展原列表,参数为可迭代对象
li = [1,2,3]
li.extend([4,"alex"])
print(li)
li = [1,2,3,4,"alex")
li.extend("123")
print(li)
li = [1,2,3,"1","2","3"]