pyhton基础学习《列表的常用操作》

Posted 2021-01-02 wings-xu

1.创建列表

name_list = [1,2,3,]  或  name_list = list([1,2,3])

2.列表的基本操作

class list(object):     #列表的类
 
    def append(self, p_object): # real signature unknown; restored from __doc__     #追加：将对象附加到列表结尾
        """ L.append(object) -> None -- append object to end """

name_list = [1,2,3,]
print(name_list)
name_list.append(11)   #添加的对象可以是一个列表、元组、单个元素
print(name_list)

    

    def clear(self): # real signature unknown; restored from __doc__               #清空列表
        """ L.clear() -> None -- remove all items from L """

name_list = [1,2,3,]
print(name_list)
name_list.clear()   
print(name_list)
     
def copy(self): # real signature unknown; restored from __doc__          #复制：浅的复制

        """ L.copy() -> list -- a shallow copy of L """

    def count(self, value): # real signature unknown; restored from __doc__               #计数：计算列表中元素出现的次数，并返回值
        """ L.count(value) -> integer -- return number of occurrences of value """
 

    def extend(self, iterable): # real signature unknown; restored from __doc__     #扩展列表：把对象添加到列表，对象可以是元素、元组、列表
        """ L.extend(iterable) -> None -- extend list by appending elements from the iterable ""
 

    def index(self, value, start=None, stop=None): # real signature unknown; restored from __doc__         #索引：查找元素的位置，并返回一个值
        """
        L.index(value, [start, [stop]]) -> integer -- return first index of value.
        Raises ValueError if the value is not present.
        """

    def insert(self, index, p_object): # real signature unknown; restored from __doc__            #插入：在索引值之前插入对象
        """ L.insert(index, object) -- insert object before index """
 

    def pop(self, index=None): # real signature unknown; restored from __doc__      #删除对象，并返回一个索引值，默认是列表最后一个
        """
        L.pop([index]) -> item -- remove and return item at index (default last).
        Raises IndexError if list is empty or index is out of range.
        """

    def remove(self, value): # real signature unknown; restored from __doc__           #删除：删除第一次值出现的对象
        """
        L.remove(value) -> None -- remove first occurrence of value.
        Raises ValueError if the value is not present.
        """

    def reverse(self): # real signature unknown; restored from __doc__         #反转
        """ L.reverse() -- reverse *IN PLACE* """
 

def sort(self, key=None, reverse=False): # real signature unknown; restored from __doc__       #排序
    """ L.sort(key=None, reverse=False) -> None -- stable sort *IN PLACE* """