首页 > 代码库 > Python-基础知识-列表list和元组tuple
Python-基础知识-列表list和元组tuple
列表List
创建列表：
>>> week = ["Sun","Mon","Tue","Wen","Thu","Fri","Sat"]
>>> week
[‘Sun‘, ‘Mon‘, ‘Tue‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘Sat‘]
基本操作：
- 索引
- 切片
- 追加
- 删除
- 长度
- 切片
- 循环
- 包含
一、索引
用索引来访问list中每一个位置的元素，记得索引是从0开始，使用-1获取list中最后一个元素：
>>> week[0] ‘Sun‘ >>> week[-1] ‘Sat‘
二、切片
>>> print(week[0:3]) #切片 [‘Sun‘, ‘Mon‘, ‘Tue‘] >>> week[3:-1] [‘Wen‘, ‘Thu‘, ‘Fri‘] >>> print(week[::2]) #带偏移切片 [‘Sun‘, ‘Tue‘, ‘Thu‘, ‘Sat‘]
三、追加
>>> week.append("One")
>>> week
[‘Sun‘, ‘Mon‘, ‘Tue‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘Sat‘, ‘One‘]
四、插入
>>> week.insert(1,"Two") #在指定位置插入元素 >>> week [‘Sun‘, ‘Two‘, ‘Mon‘, ‘Tue‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘Sat‘, ‘One‘]
五、修改
>>> week = ["Sun","Mon","Tue","Wen","Thu","Fri","Sat"] >>> week [‘Sun‘, ‘Mon‘, ‘Tue‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘Sat‘] >>> week[1] = "Four" #修改指定元素的值 >>> week [‘Sun‘, ‘Four‘, ‘Tue‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘Sat‘]
六、删除
>>> week.remove("One") #删除list中指定值的元素
>>> week
[‘Sun‘, ‘Four‘, ‘Mon‘, ‘Tue‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘Sat‘]
>>> del week[3] #删除list中指定位置元素
[‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘Sat‘]
>>> week.pop() #删除list中最后一个元素
‘Sat‘
>>> week
[‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘]
七、扩展
>>> Num = ["One","Two","Three","Four","Five","Six","Seven"] >>> week.extend(Num) >>> week [‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘]
八、拷贝
>>> week2 = week.copy() #深复制,id值不一样 >>> week [‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘] >>> week2 [‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘] >>> id(week) 2608861285192 >>> id(week2) 2608861285896 >>> week2 = week #浅复制，id值一样 >>> week [‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘] >>> week2 [‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘] >>> id(week) 2608861285192 >>> id(week2) 2608861285192 #另一种复制方法 >>> import copy >>> week2 = copy.deepcopy(week) >>> week [‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘] >>> week2 [‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘] >>> id(week) 2608861285192 >>> id(week2) 2608862744520 >>> week2 = copy.copy(week) >>> week [‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘] >>> week2 [‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘] >>> id(week) 2608861285192 >>> id(week2) 2608861304840
九、排序和翻转
>>> names [‘Alex‘, ‘Tenglan‘, ‘Amy‘, ‘Tom‘, ‘Amy‘, 1, 2, 3] >>> names.sort() #排序 Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unorderable types: int() < str() #3.0里不同数据类型不能放在一起排序了，擦 >>> names[-3] = ‘1‘ >>> names[-2] = ‘2‘ >>> names[-1] = ‘3‘ >>> names [‘Alex‘, ‘Amy‘, ‘Amy‘, ‘Tenglan‘, ‘Tom‘, ‘1‘, ‘2‘, ‘3‘] >>> names.sort() >>> names [‘1‘, ‘2‘, ‘3‘, ‘Alex‘, ‘Amy‘, ‘Amy‘, ‘Tenglan‘, ‘Tom‘] >>> names.reverse() #反转 >>> names [‘Tom‘, ‘Tenglan‘, ‘Amy‘, ‘Amy‘, ‘Alex‘, ‘3‘, ‘2‘, ‘1‘]
十、统计
>>> names
[‘Alex‘, ‘Tenglan‘, ‘Amy‘, ‘Tom‘, ‘Amy‘, 1, 2, 3]
>>> names.count("Amy")
2
十一、获取下标
>>> week
[‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘]
>>> week.index("Mon") #返回第一个找到的元素的下标
2
元组Tuple
元组其实跟列表差不多，也是存一组数，只不是它一旦创建，便不能再修改，所以又叫只读列表。
创建元组，因为元组不能修改，它只有2个方法，一个是count，一个是index。
>>> week = (‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘)
>>> week
(‘Sun‘, ‘Four‘, ‘Mon‘, ‘Wen‘, ‘Thu‘, ‘Fri‘, ‘One‘, ‘Two‘, ‘Three‘, ‘Four‘, ‘Five‘, ‘Six‘, ‘Seven‘)
>>> week.index("Mon")
2
>>> week.count(‘Mon‘)
1
Python-基础知识-列表list和元组tuple
声明：以上内容来自用户投稿及互联网公开渠道收集整理发布，本网站不拥有所有权，未作人工编辑处理，也不承担相关法律责任，若内容有误或涉及侵权可进行投诉： 投诉/举报 工作人员会在5个工作日内联系你，一经查实，本站将立刻删除涉嫌侵权内容。