'''
description: 列表的操作
Version: 1.0
Author: Victor
Date: 2023年4月18日

'''

def ListFunc_len():
 '''
 len函数访问列表长度
 '''
 pass

def ListFunc_append():
 '''
 append函数向列表末尾添加元素,无返回值
 '''
 append_list = [1, 2, 3]
 append_list.append(4)
 print("列表元素", append_list)

 append_list=["hello","world"]
 append_list.append("python")
 print("列表元素",append_list)

def ListFunc_insert():
 '''
 insert()函数向列表中插入元素,无返回值
 '''

 insert_list=[1,2,3]
 insert_list.insert(2,10)
 print("列表元素",insert_list)

 insert_list=["hello","world"]
 insert_list.insert(0,"python")
 print("列表元素",insert_list)

def ListFunc_extend():
 '''
 extend函数在列表的末尾添加另一个列表
 '''

 list_a = [1,2,3]
 list_b = [4,5,6]
 list_a.extend(list_b)

 print("输出列表list_a",list_a)

def ListFunc_del():
 '''
 del:可以直接删除列表,也可以删除指定下标数据
 '''
 pass

def ListFunc_remove():
 '''
 remove函数从列表移除元素,无返回值
 '''

 remove_list = [1,2,3]
 remove_list.remove(3)
 
 print("输出列表remove_list:",remove_list)

 remove_list=["hello","world","python","hello"]
 remove_list.remove("hello")
 print("输出列表remove_list:",remove_list)

def ListFunc_pop():
 '''
 pop函数移除列表中指定位置的元素,并返回要移除的元素。
 '''
 pop_list = ["hello","world","python","hello"]
 elem = pop_list.pop(1)
 print("移除的元素是:",elem)
 print("移除元素后的列表:",pop_list)


def ListFunc_clear():
 '''
 clear函数用于将列表清空
 '''
 clear_list = ["hello","world","python","hello"]
 clear_list.clear()

 print("输出清空后的列表:",clear_list)
 print("输出清空后的列表长度:",len(clear_list))

def ListFunc_reverse():
 '''
 reverse函数用于将列表反向排列
 '''
 reverse_list = ["hello","world","python","hello"]
 reverse_list.reverse()
 print("输出反向排列的列表:",reverse_list)

def ListFunc_sort():
 '''
 sort函数用于将列表进行排序
 '''
 sort_list = ["hello","world","hello","python"]
 # 默认进行升序排列
 sort_list.sort()
 print("将列表进行升序排序:",sort_list)

 sort_list = [1,9,6,7]
 # 降序排列
 sort_list.sort(reverse=True)
 print("对列表进行降序排序:",sort_list)

 sort_list=[{"price":10.5},
 {"price":24},
 {"price":15}]

 sort_list.sort(key=lambda item:item["price"],reverse=True)
 print("对列表中数据按指定条件进行降序排序:\n",sort_list)


def ListFunc_copy():
 '''
 copy函数用于创建列表的副本
 '''
 list_a=["hello","world","hello","python"]
 list_b = list_a.copy()
 print("创建list_a的一个副本并赋值给list_b:",list_b)

 del list_a[0]
 print("删除list_a[0]元素后,在输出list_b:",list_b)

 list_c = ["hello","world","hello","python"]
 list_d = list_c
 del list_c[0]
 print("删除list_c[0]元素后,再输出list_d:",list_d)


def ListFunc_index():
 '''
 index函数用于返回所匹配的元素的索引
 '''
 index_list = ["hello","world","hello","python"]
 result = index_list.index("hello")
 print("hello在列表中的索引位置:",result)

 result = index_list.index("hello",1,3)
 print("hello在列表中的索引位置:",result)

def ListFunc_count():
 '''
 count函数用于统计某个元素在列表中出现的次数
 '''
 count_list = ["hello","world","hello","python"]
 result = count_list.count("world")
 print("world在列表中的个数:",result)

 result = count_list.count("hello")
 print("hello在列表中的个数:",result)

def ListFunc_count():
 '''
 count函数用于统计某个元素在列表中出现的次数
 '''
 count_list = ["hello","world","hello","python"]
 result = count_list.count("world")
 print("world在列表中的个数:",result)

 result = count_list.count("hello")
 print("hello在列表中的个数:",result)

def ListFunc_traversal():
 '''
 列表遍历
 '''
 # while循环:
 i = 0
 traversal_list = ["hello","world","hello","python"]
 while i < len(traversal_list):
 print(traversal_list[i])
 i += 1

 # for循环:

 for i in range(len(traversal_list)):
 print(i, end=' ')
 print(traversal_list[i])

 for ele in traversal_list:
 print(traversal_list.index(ele), end=' ')
 print(ele)

 for i, s in enumerate(traversal_list):
 print(i, end=' ')
 print(s)


def ListFunc_nesting():
 '''
 列表嵌套
 '''
 nesting_list =[['A', 'G', 'H'], ['E', 'F'], ['B', 'C', 'D']]
 for j in nesting_list:
 for k in j:
 print(k,end='')
 print()


if __name__ == '__main__':
 ListFunc_len()
 ListFunc_append()
 ListFunc_insert()
 ListFunc_extend()
 ListFunc_del()
 ListFunc_remove()
 ListFunc_pop()
 ListFunc_clear()
 ListFunc_reverse()
 ListFunc_sort()
 ListFunc_copy()
 ListFunc_index()
 ListFunc_count()
 ListFunc_traversal()
 ListFunc_nesting()