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Python3入门系列 | Day 7: 字符串操作——文本处理基本功

  • 2026-07-02 08:54:47
Python3入门系列 | Day 7: 字符串操作——文本处理基本功

昨天我们学了元组和集合,知道了什么是"不可变"以及怎么快速去重。今天的内容更贴近日常:字符串操作

不管你是爬虫、数据分析,还是写 Web 应用,80% 以上的场景都在跟文本打交道。把字符串操作用熟了,写代码的效率能提升一大截。

一、字符串就是文本

先理清一个最基本的概念。在 Python 里,字符串就是一串字符,用单引号或双引号包起来都行。

name = '张三'city = "北京"

单引号双引号没区别,唯一的坑是:如果你字符串里本身有单引号,外面就用双引号,反过来也一样。

sentence = "我说:'今天天气不错'"

如果是长文本,三引号是你的好朋友:

long_text = """这是第一行这是第二行这是第三行"""

二、字符串拼接——把内容串起来

最直观的方式是用 +

first = "张"last = "三"full = first + last  # "张三"

但如果你想在中间加空格或标点,重复写 + 很烦人。推荐用 f-string:

name = "张三"age = 25# f-string,Python 3.6+ 可用info = f"我叫{name},今年{age}岁"print(info)  # 输出:我叫张三,今年25岁

花括号里可以直接写变量名,甚至写表达式:

price = 9.9count = 3total = f"总价:{price * count}元"print(total)  # 输出:总价:29.7元

以前我还用过 % 格式化和 format() 方法,但自从有了 f-string,我基本只用它了。简单直接。

三、字符串索引与切片——取某一段

字符串可以理解成"字符组成的列表",所以能用下标取单个字符:

text = "Hello Python"print(text[0])   # 输出:H(下标从0开始)print(text[6])   # 输出:P(空格占1位)print(text[-1])  # 输出:n(-1表示倒数第一个)

切片是 Python 的特色语法,用一个冒号取子串:

text = "Hello Python"print(text[0:5])    # 输出:Hello(取下标0到4,左闭右开)print(text[6:])     # 输出:Python(从6到最后)print(text[:5])     # 输出:Hello(从头到5)print(text[-6:])    # 输出:Python(取后6个字符)

记法:[start:end],取 start 到 end-1 这一段。第二个不写就取到底,第一个不写就从开头取。

四、常用字符串方法——干活就靠这些

Python 的字符串方法非常丰富,下面这几个是日常最高频的。

去掉空白字符

从用户输入或者文件里读数据,经常带着多余的空格和换行。

raw = "   Hello World   \n"print(raw.strip())      # "Hello World"(去掉首尾空白)print(raw.lstrip())     # "Hello World   \n"(去掉左边空白)print(raw.rstrip())     # "   Hello World"(去掉右边空白)

记住 strip(),几乎每个处理文本的程序都会用到。

分割与合并

一个字符串按某个分隔符拆成列表,或者反过来说,把列表拼成字符串。

# 分割data = "apple,banana,orange"fruits = data.split(",")print(fruits)   # ['apple', 'banana', 'orange']# 合并fruits = ['apple''banana''orange']text = ", ".join(fruits)print(text)     # "apple, banana, orange"

join 的写法有点反直觉——它是字符串的方法,不是列表的方法。"分隔符".join(列表),记住这个顺序就行。

查找与替换

text = "Hello World, Hello Python"# 查找子串位置print(text.find("World"))     # 输出:6(下标从0开始)print(text.find("Java"))      # 输出:-1(没找到)# 是否包含print("Hello"in text)        # Trueprint("Java"notin text)     # True# 替换new_text = text.replace("Hello""你好")print(new_text)               # "你好 World, 你好 Python"

find 和 in 的区别:in 只返回 True/False,find 返回位置下标。判断有没有某个词用 in,想知道在哪用 find

大小写转换

text = "hello python"print(text.upper())         # "HELLO PYTHON"print(text.capitalize())    # "Hello python"(首字母大写)print(text.title())         # "Hello Python"(每个单词首字母大写)

判断内容

print("123".isdigit())      # Trueprint("abc".isalpha())      # Trueprint("abc123".isalnum())   # True(字母或数字)print("  ".isspace())       # True(全是空白字符)

这些判断方法在数据清洗时特别有用——比如判断用户输入的是不是纯数字,或者过滤掉空行。

五、转义字符——特殊符号怎么表示

当你想在字符串里放引号、换行、Tab,就要用到转义字符:

# 换行print("第一行\n第二行")# 输出:# 第一行# 第二行# Tabprint("a\tb")# 输出:a    b# 反斜杠本身print("C:\\Users\\张三")# 输出:C:\Users\张三# 原始字符串(推荐文件路径用这个)print(r"C:\Users\张三")# 输出:C:\Users\张三(加 r 就不需要转义了)

文件路径我每次都写成原始字符串(前面加 r),省得被反斜杠坑。

六、一个真实的场景——清洗用户手机号

把零散的知识点串起来,看一个实际例子。假设用户输入了一个手机号,里面可能带了空格、短横线或者加号前缀,我们要清洗成纯数字:

raw_input = "   +86 138-1234-5678  "defclean_phone(phone_str):# 去掉首尾空白    phone = phone_str.strip()# 去掉可能存在的国际区号if phone.startswith("+86"):        phone = phone[3:]# 去掉所有空格和短横线    phone = phone.replace(" """).replace("-""")return phoneresult = clean_phone(raw_input)print(result)  # 输出:13812345678

这一串操作里,用了 stripstartswith、切片、replace——都是今天讲的方法。把这些基础方法组合起来,就能处理很多实际问题。

小结

今天的内容比较多,但全是干货。记不住的不用硬背,写代码时多查几次自然就熟了。重点记住这几个:

  • strip() 去掉多余空白
  • split() 按分隔符拆成列表
  • join() 把列表拼回字符串
  • replace() 替换文本
  • f-string 格式化字符串

字符串操作是 Python 里最常用的技能之一。多练几次,你会发现自己在不知不觉中就用得很熟练了。

下一篇:Day 8 —— 函数——把重复代码封起来

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  1. CONNECT:[ UseTime:0.000907s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000846s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000299s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000351s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000470s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000497s ]
  8. SELECT * FROM `article` WHERE `id` = 491852 LIMIT 1 [ RunTime:0.001011s ]
  9. UPDATE `article` SET `lasttime` = 1783123947 WHERE `id` = 491852 [ RunTime:0.013482s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000250s ]
  11. SELECT * FROM `article` WHERE `id` < 491852 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000457s ]
  12. SELECT * FROM `article` WHERE `id` > 491852 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000376s ]
  13. SELECT * FROM `article` WHERE `id` < 491852 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000775s ]
  14. SELECT * FROM `article` WHERE `id` < 491852 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001004s ]
  15. SELECT * FROM `article` WHERE `id` < 491852 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014630s ]
0.191561s