列表類型內置方法

目錄

• 一、列表類型內置方法(list)
  • 1.1 優先掌握(*****)
  • 1.2 需要掌握(****)

一、列表類型內置方法(list)

1.用途：多個裝備、多個愛好、多門課程，甚至是多個女朋友

2.定義：[]內可以有多個任意類型的值，逗號分隔元素

# 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+內置方法：常用操作和內置方法分為優先掌握（今天必須得記住）、需要掌握（一周內記住）、其他操作（了解）三個部分。

1.1 優先掌握(*****)

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. 長度len

4. 成員運算in和not in

5. 追加append

6. 刪除del

7. 循環

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 = ['nick', 'jason', 'tank', 'sean']
name_list[0] = 'nick handsom'
# name_list[1000] = 'tank sb'  # 報錯

print(f"name_list[0]: {name_list[0]}")

name_list[0]: nick handsom

2.切片

# list之切片
name_list = ['nick', 'jason', 'tank', 'sean']

print(f"name_list[0:3:2]: {name_list[0:3:2]}")

name_list[0:3:2]: ['nick', 'tank']

3.長度

# list之長度
name_list = ['nick', 'jason', 'tank', 'sean']

print(f"len(name_list): {len(name_list)}")

len(name_list): 4

4.成員運算in和not in

# list之成員運算in和not in
name_list = ['nick', 'jason', 'tank', 'sean']

print(f"'tank sb' in name_list: {'tank sb' in name_list}")
print(f"'nick handsome' not in name_list: {'nick handsome' not in name_list}")

'tank sb' in name_list: False
'nick handsome' not in name_list: True

5.追加值

# list之追加值
name_list = ['nick', 'jason', 'tank', 'sean']
name_list.append('tank sb')

print(f"name_list: {name_list}")

name_list: ['nick', 'jason', 'tank', 'sean', 'tank sb']

6.刪除

# list之刪除
name_list = ['nick', 'jason', 'tank', 'sean']
del name_list[2]

print(f"name_list: {name_list}")

name_list: ['nick', 'jason', 'sean']

7.循環

# list之循環
name_list = ['nick', 'jason', 'tank', 'sean']

for name in name_list:
    print(name)

nick
jason
tank
sean

1.2 需要掌握(****)

1. insert

2. pop

3. remove

4. count

5. index

6. clear

7. copy

8. extend

9. reverse

10. sort

1.insert()

# list之insert()
name_list = ['nick', 'jason', 'tank', 'sean']
name_list.insert(1, 'handsome')

print(f"name_list: {name_list}")

name_list: ['nick', 'handsome', 'jason', 'tank', 'sean']

2.pop()

# list之pop()，pop()默認刪除最后一個元素
name_list = ['nick', 'jason', 'tank', 'sean']

print(f"name_list.pop(1): {name_list.pop(1)}")
print(f"name_list: {name_list}")

name_list.pop(1): jason
name_list: ['nick', 'tank', 'sean']

3.remove()

# list之remove()
name_list = ['nick', 'jason', 'tank', 'sean']

print(f"name_list.remove('nick'): {name_list.remove('nick')}")
print(f"name_list: {name_list}")

name_list.remove('nick'): None
name_list: ['jason', 'tank', 'sean']

4.count()

# list之count()
name_list = ['nick', 'jason', 'tank', 'sean']

print(f"name_list.count('nick'): {name_list.count('nick')}")

name_list.count('nick'): 1

5.index()

# list之index()
name_list = ['nick', 'jason', 'tank', 'sean']

print(f"name_list.index('nick'): {name_list.index('nick')}")

name_list.index('nick'): 0

6.clear()

# list之clear()
name_list = ['nick', 'jason', 'tank', 'sean']
name_list.clear()

print(f"name_list: {name_list}")

name_list: []

7.copy()

# list之copy()
name_list = ['nick', 'jason', 'tank', 'sean']

print(f"name_list.copy(): {name_list.copy()}")

name_list.copy(): ['nick', 'jason', 'tank', 'sean']

8.extend()

# list之extend()
name_list = ['nick', 'jason', 'tank', 'sean']
name_list2 = ['nick handsome']
name_list.extend(name_list2)

print(f"name_list: {name_list}")

name_list: ['nick', 'jason', 'tank', 'sean', 'nick handsome']

9.reverse()

# list之reverse()
name_list = ['nick', 'jason', 'tank', 'sean']
name_list.reverse()

print(f"name_list: {name_list}")

name_list: ['sean', 'tank', 'jason', 'nick']

10.sort()

# list之sort()，使用sort列表的元素必須是同類型的
name_list = ['nick', 'jason', 'tank', 'sean']
name_list.sort()

print(f"name_list: {name_list}")

name_list.sort(reverse=True)
print(f"name_list_reverse: {name_list}")

name_list: ['jason', 'nick', 'sean', 'tank']
name_list_reverse: ['tank', 'sean', 'nick', 'jason']

4.存一個值or多個值：多個值

5.有序or無序：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

6.可變or不可變：可變數據類型