目录
列表类型内置方法
常用操作+内置方法
优先掌握(***)
按索引取值,可存可取
# list之索引取值
name_list = ['nick', 'jason', 'tank', 'sean']
name_list[0] = 'nick handsom'
# name_list[1000] = 'tank sb' # 报错
print(f"name_list[0]: {name_list[0]}")
name_list[0]: nick handsom
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']
长度
# list之长度
name_list = ['nick', 'jason', 'tank', 'sean']
print(f"len(name_list): {len(name_list)}")
成员运算in和not in
# list之成员运算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
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']
删除
# list之删除,也可以删除一个切片范围内的值,甚至可以删除整个列表
name_list = ['nick', 'jason', 'tank', 'sean']
del name_list[2]
print(f"name_list: {name_list}")
name_list: ['nick', 'jason', 'sean']
循环
# list之循环
name_list = ['nick', 'jason', 'tank', 'sean']
for name in name_list:
print(name)
nick
jason
tank
sean
需要掌握(**)
insert()(在指定索引处插入一个元素)
# 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']
pop()(删除指定索引的元素,执行方法时会返回这个元素,不指定索引时默认最后一个)
# list之pop(),pop()默认删除最后一个元素,并返回一个被删除的元素
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']
remove()(删除首个符合你删除要求--和你给出的值相等--的元素)
# 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']
count()(计数器,给出你输入元素值的出现次数)
list之index()
name_list = ['nick', 'jason', 'tank', 'sean']
print(f"name_list.index('nick'): {name_list.index('nick')}")
name_list.index('nick'): 0
index()(查找到给定元素值的索引)
# list之index()
name_list = ['nick', 'jason', 'tank', 'sean']
print(f"name_list.index('nick'): {name_list.index('nick')}")
name_list.index('nick'): 0
clear()(清空整个列表的所有元素)
# list之clear()
name_list = ['nick', 'jason', 'tank', 'sean']
name_list.clear()
print(f"name_list: {name_list}")
name_list: []
copy()(复制整个列表,用于其他操作)
# list之copy()
name_list = ['nick', 'jason', 'tank', 'sean']
print(f"name_list.copy(): {name_list.copy()}")
name_list.copy(): ['nick', 'jason', 'tank', 'sean']
extend()(把另一个列表中的所有元素扩展到指定列表中)
# list之extend()
name_list = ['nick', 'jason', 'tank', 'sean']
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