列表类型内置方法(list)
1.用途：多个装备、多个爱好、多门课程，甚至是多个女朋友
- 2.定义：[]内可以有多个任意类型的值，逗号分隔元素
# my_girl_friend = list(['jason','tank','sean'])
my_girl_friend = ['jason', 'tank', 'sean']
print(f"my_girl_friend: {my_girl_friend}")my_girl_friend: ['jason', 'tank', 'sean']
l = list('hello nick')
print(f"l: {l}")l: ['h', 'e', 'l', 'l', 'o', ' ', 'n', 'i', 'c', 'k']
3*.常用操作+内置方法：
1.按索引取值（正向取值+反向取值），即可存也可以取
2.切片
3.长度len
4.成员运算in和not in
5.追加append
6.删除del
7.循环
1.按索引取值（正向取值+反向取值），即可存也可以取
# list之索引取值
name_list = ['nash', 'langyigang', 'fujiachen', 'jinyi']
name_list[0] = 'nash handsom'
# name_list[1000] = 'tank sb' # 报错
print(f"name_list[0]: {name_list[0]}")name_list[0]: nash handsom
2.切片
# list之切片
name_list = ['nash', 'langyigang', 'fujiachen', 'jinyi']
print(f"name_list[0:3:2]: {name_list[0:3:2]}")name_list[0:3:2]: ['nash', 'fujiachen']
3.长度
# list之长度
name_list = ['nash', 'langyigang', 'fujiachen', 'jinyi']
print(f"len(name_list): {len(name_list)}")len(name_list): 4
4.成员运算in和not in
# list之成员运算in和not in
name_list = ['nash', 'fujiachen', 'langyigang', 'jinyi']
print(f"'langyigang sb' in name_list: {'langyigang sb' in name_list}")
print(f"'nash handsome' not in name_list: {'nash handsome' not in name_list}")'fujiachen sb' in name_list: False 'nash handsome' not in name_list: True
5.追加值
# list之追加值
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
name_list.append('langyigang sb')
print(f"name_list: {name_list}")name_list: ['nash', 'xuguangduo', 'fujiachen', 'jinyi', 'langyigang sb']
6.删除
# list之删除
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
del name_list[2]
print(f"name_list: {name_list}")name_list: ['nash', 'xuguangduo', 'jinyi']
7.循环
# list之循环
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
for name in name_list:
print(name)nash xuguangduo fujiachen jinyi
其他方法
insert
pop
remove
count
index
clear
copy
extend
reverse
sort
1.insert()
# list之insert()
name_list =
name_list.insert(1, 'handsome')
print(f"name_list: {name_list}")name_list: ['nash', 'handsome', 'xuguangduo', 'fujiachen', 'jinyi']
2.pop()
# list之pop()，pop()默认删除最后一个元素
name_list = ['nash','xuguangduo', 'fujiachen', 'jinyi']
print(f"name_list.pop(1): {name_list.pop(1)}")
print(f"name_list: {name_list}")name_list.pop(1): jason name_list: ['nash', 'fujiachen', 'jinyi']
3.remove()
# list之remove()
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
print(f"name_list.remove('nash'): {name_list.remove('nick')}")
print(f"name_list: {name_list}")
name_list.remove('nick'): None name_list: ['xuguangduo', 'fujiachen', 'jinyi']
4.count()
# list之count()
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
print(f"name_list.count('nash'): {name_list.count('nash')}")name_list.count('nash'): 1
5.index()
# list之index()
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
print(f"name_list.index('nash'): {name_list.index('nash')}")name_list.index('nash'): 0
6.clear()
# list之clear()
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
name_list.clear()
print(f"name_list: {name_list}")name_list: []
7.copy()
# list之copy()
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
print(f"name_list.copy(): {name_list.copy()}")name_list.copy(): ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
8.extend()
# list之extend()
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
name_list2 = ['nash handsome']
name_list.extend(name_list2)
print(f"name_list: {name_list}")name_list: ['nash', 'xuguangduo', 'fujiachen', 'jinyi', 'nash handsome']
9.reverse()
# list之reverse()
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
name_list.reverse()
print(f"name_list: {name_list}")name_list: ['jinyi', 'fujiachen', 'xuguangduo', 'nash']
10.sort()
# list之sort()，使用sort列表的元素必须是同类型的
name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi']
name_list.sort()
print(f"name_list: {name_list}")
name_list.sort(reverse=True)
print(f"name_list_reverse: {name_list}")name_list = ['nash', 'xuguangduo', 'fujiachen', 'jinyi'] name_list.sort() print(f"name_list: {name_list}") name_list.sort(reverse=True) print(f"name_list_reverse: {name_list}") ``
存一个值or多个值：
多个值
有序or无序：有序
hobby_list = ['read', 'run', 'girl']
print(f'first:{id(hobby_list)}')
hobby_list[2] = ''
print(f'second:{id(hobby_list)}')
first:4522187016
second:4522187016