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Python快速入门学习笔记八:数据容器 之 字符串

  • 2026-06-29 14:05:11
Python快速入门学习笔记八:数据容器 之 字符串

Python入门第八课,主要学习最重要的数据容器——字符串,字符串是Python中表示文本的不可变序列,支持丰富的操作方法,是进行文本处理和数据清洗的基础工具。

  • 什么是字符串
  • 下标
  • 常用方法
    • index()
    • split()
    • replace()
    • count()
    • strip()
  • 常用内置函数
  • 遍历字符串

什么是字符串

字符串是用来存储一组有序的字符数据,但其中的内容不可修改(只能查,不能增删改)。

下标

字符串和列表、元组一样,也支持下标。

msg = 'welcome to taiyuan'print(msg[1])print(msg[-1])

常用方法

index()

使用字符串.index(字符),获取指定字符在字符串中第一次出现的下标,返回值:下标。

msg = 'welcome to taiyuan'result = msg.index('t')print(result)

split()

使用字符串.split(字符),将字符串按照指定字符进行分隔,返回值:列表。

day = '2026-03-18'result = day.split('-')print(result, type(result)) # ['2026', '03', '18'] <class 'list'>print(day) # 2026-03-18

replace()

使用字符串.replace(被替换的字符串片段,目标字符串),将字符串中被替换的字符串替换成目标字符串,不会修改原字符串,返回新字符串。

msg = 'welcome to taiyuan'result = msg.replace('taiyuan''太原')print(result) # welcome to 太原print(msg) # welcome to taiyuan

count()

使用字符串.count(字符),统计指定字符在字符串中出现的次数。

msg = 'welcome to taiyuan'result = msg.count('o')print(result) # 2

strip()

使用字符串.strip(字符),从某个字符串中删除指定字符串中的任意字符,不会不会修改原字符串,返回值:新字符串。删除规则是:从字符串的两端开始删除,直到遇到第一个不在指定字符串中的字符就停止。

# 删除两端的msg1 = '666尚6硅6谷6666'result = msg1.strip('6')print(result) # 尚6硅6谷# 删除两端的,与字符顺序无关msg2 = '1234尚12硅34谷3412'result = msg2.strip('1324')print(result)  # 尚12硅34谷# 删除两端的,遇到第一个不在strip方法参数指定的字符串字符就停止msg3 = '34215尚12硅34谷4132'result = msg3.strip('5432')print(result) # 15尚12硅34谷41

注意:如果 strip() 的参数省略或为None,则会删除两端的空白。

msg4 = '  尚硅谷   'result = msg4.strip()print(result) # 尚硅谷print(msg4) #   尚硅谷result = msg4.strip(None)print(result) # 尚硅谷print(msg4) #   尚硅谷

Python还有更多好玩的方法,请阅读官方手册:https://docs.python.org/zh-cn/3.13/library/stdtypes.html#string-methods

常用内置函数

字符串也可以使用:max()、min()、len()、sorted() 等函数,但实际开发中 len() 最常用。

使用len(字符串)获取字符串中的字符的个数(字符串长度)。

msg1 = '12345'print(len(msg1)) # 5msg2 = 'abcd'print(len(msg2)) # 4msg3 = '大龄程序员'print(len(msg3)) # 5

注意:一个数据或一个字母代表长度1,一个汉字也代表长度1。

学习更多内置函数,请阅读官方手册:https://docs.python.org/zh-cn/3.13/library/functions.html#len

遍历字符串

字符串与列表、元组一样,也可以使用 while 或 for 来循环遍历。

# 使用while遍历字符串words = 'welcome'index = 0while index < len(words):    print(words[index])    index += 1print() # 换行# 使用for遍历字符串for letter in words:    print(letter)

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  1. CONNECT:[ UseTime:0.000890s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000823s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006806s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000607s ]
  6. SELECT * FROM `set` [ RunTime:0.000219s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000512s ]
  8. SELECT * FROM `article` WHERE `id` = 490033 LIMIT 1 [ RunTime:0.000406s ]
  9. UPDATE `article` SET `lasttime` = 1783134308 WHERE `id` = 490033 [ RunTime:0.013339s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001973s ]
  11. SELECT * FROM `article` WHERE `id` < 490033 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000493s ]
  12. SELECT * FROM `article` WHERE `id` > 490033 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000373s ]
  13. SELECT * FROM `article` WHERE `id` < 490033 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001643s ]
  14. SELECT * FROM `article` WHERE `id` < 490033 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000700s ]
  15. SELECT * FROM `article` WHERE `id` < 490033 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003240s ]
0.143821s