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Python快速入门学习笔记九:数据容器 之 序列操作(切片、相加、重复)

  • 2026-06-30 10:30:20
Python快速入门学习笔记九:数据容器 之 序列操作(切片、相加、重复)

Python入门第九课,主要学习最重要的数据容器——序列的常用操作,切片、相加、重复等序列操作,提供了灵活的数据提取、组合与复制功能,是高效处理有序数据的核心工具。

  • 什么是序列
  • 什么是切片
  • 切片语法格式
  • 序列相加
  • 序列相乘(重复)

什么是序列

何为序列?—— 能连续存放元素的数据容器,而且元素有先后顺序,并可以通过下标访问,就是序列。比如之前学过的:列表、元组、字符串,都是序列。

什么是切片

何为切片?—— 从序列中按照指定的范围,取出一部分元素,形成一个新的序列的操作。

切片是序列的一个重要操作,当然序列还有其他常用操作,如:相加、相乘(重复),下文会详细介绍。

切片语法格式

基本语法:

序列[起始索引:结束索引:步长]

语法解析:

  • 切片操作的区间是左闭右开的,即:截取时包含起始位置,但不包含结束位置。
  • 步长是指取出元素时的间隔,例如:
    • 步长为 1,就是一个一个取出;
    • 步长为 2,就是每次越过 1 个元素取出;
    • 步长为 3,就是每次越过 2 个元素取出;
    • 步长为 n,就是每次越过 (n-1)个元素取出。
  • 起始索引默认值为0,结束索引默认截取到末尾,步长默认为1。
  • 当起始索引大于结束索引时,步长必须为负数,否则结果是空列表。

示例代码:

# 对列表切片list1 = [012345678910]print(list1[0:5:1]) # [0, 1, 2, 3, 4]print(list1[1:8:2]) # [1, 3, 5, 7]print(list1[1:8:3]) # [1, 4, 7]print(list1[::]) # [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]print(list1[:999:]) # [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]print(list1[3::]) # [3, 4, 5, 6, 7, 8, 9, 10]print(list1[:5:]) # [0, 1, 2, 3, 4]print(list1[::4]) # [0, 4, 8]print(list1[7:2:-1]) # [7, 6, 5, 4, 3]print(list1[::-1]) # [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]print() # 换行# 对元组进行切片tuple1 = (012345678910)print(tuple1[0:5:1]) # (0, 1, 2, 3, 4)print(tuple1[1:8:2]) # (1, 3, 5, 7)print(tuple1[::-1]) # (10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)print() # 换行# 对字符串进行切片msg1 = '0123456789'print(msg1[0:5:1]) # 01234print(msg1[1:8:2]) # 1357print(msg1[::-1]) # 9876543210

序列相加

就是把两个序列拼接在一起。

需要注意的是:只有同类型的序列才能相加(字符串+字符串、列表+列表、元组+元组)。

示例代码:

# 列表相加list1 = [0123]list2 = ['a''b''c''d']print(list1 + list2) # [0, 1, 2, 3, 'a', 'b', 'c', 'd']# 元组相加tuple1 = (0123)tuple2 = ('a''b''c''d')print(tuple1 + tuple2) # (0, 1, 2, 3, 'a', 'b', 'c', 'd')# 字符串相加str1 = '01234'str2 = '56789'print(str1 + str2) # 0123456789

序列相乘(重复)

就是把序列重复指定的次数。

# 列表list1 = [0123]print(list1 * 3)# 元组tuple1 = (0123)print(tuple1 * 3)# 字符串str1 = '01234'print(str1 * 3)

学习感受,虽然只是浅浅的学习了序列的常用基础操作,但是作为有着十几年PHP Web开发经验的程序员,真心觉得 python 的语法真的太简洁,太高效了,和给了我更大的学习动力。

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  1. CONNECT:[ UseTime:0.000575s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000791s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002638s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.042370s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000979s ]
  6. SELECT * FROM `set` [ RunTime:0.070198s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000852s ]
  8. SELECT * FROM `article` WHERE `id` = 490235 LIMIT 1 [ RunTime:0.103186s ]
  9. UPDATE `article` SET `lasttime` = 1783123843 WHERE `id` = 490235 [ RunTime:0.083155s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.041573s ]
  11. SELECT * FROM `article` WHERE `id` < 490235 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000790s ]
  12. SELECT * FROM `article` WHERE `id` > 490235 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000486s ]
  13. SELECT * FROM `article` WHERE `id` < 490235 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000909s ]
  14. SELECT * FROM `article` WHERE `id` < 490235 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009950s ]
  15. SELECT * FROM `article` WHERE `id` < 490235 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.022985s ]
0.460141s