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Python基础数据类型与变量—字符串

  • 2026-08-18 23:12:04
Python基础数据类型与变量—字符串

1 定义

字符串 (String) 是用于表示文本的数据类型,由零个或多个字符组成的不可变序列。可以使用单引号 ('...')、双引号 ("...") 或三引号 ('''...''' 或 """...""") 创建字符串。 三引号可以用于创建多行字符串

代码:

# 创建字符串str1 = 'Hello'str2 = "World"str3 = """This is amulti-line string"""print(str1)print(str2)print(str3)

2 索引和切片

字符串中的字符可以通过索引访问,也可以通过切片获取子字符串。

代码:

# 索引和切片string = "Python"print(f"第一个字符:{string[0]}, 最后一个字符:{string[-1]}, 切片:{string[1:4]}"# P, n, yth

3 拼接

可以使用 + 运算符将多个字符串拼接成一个字符串。

代码:

# 拼接greeting = str1 + " " + str2print(greeting)  # Hello World

4 格式化

可以使用 % 运算符、.format() 方法或 f-string 对字符串进行格式化。

代码:

# 格式化name = "Alice"age = 30print("Hello, %s! You are %d years old." % (name, age))  # 使用 % 运算符print("Hello, {}! You are {} years old.".format(name, age))  # 使用 .format() 方法print(f"Hello, {name}! You are {age} years old.")  # 使用 f-string

5 常用方法

find():查找子字符串。    replace():替换子字符串。    split():分割字符串。    join():连接字符串。    upper():转换为大写。    lower():转换为小写。    strip():去除字符串两端的空格。 

代码:

# 常用方法text = "  Python is awesome!  "print(f"查找 'is' 的位置:{text.find('is')}")print(f"替换 'awesome' 为 'great':{text.replace('awesome''great')}")print(f"分割字符串:{text.split()}")print(f"转换为大写:{text.upper()}")print(f"转换为小写:{text.lower()}")print(f"去除空格:{text.strip()}")

6 案例

①字符串反转

代码:

#字符串反转def reverse_string(s):    """    反转字符串.    Args:        s: 待反转的字符串.    Returns:        反转后的字符串.    """    return s[::-1# 使用切片实现反转print(f"反转 'Python':{reverse_string('Python')}")

②统计字符串中某个字符出现的次数

代码:

def count_char(s, char):    """    统计字符串中某个字符出现的次数.    Args:        s: 待统计的字符串.        char: 待统计的字符.    Returns:        字符出现的次数.    """    count = 0    for c in s:        if c == char:            count += 1    return countprint(f"字符串 'banana' 中 'a' 出现的次数:{count_char('banana''a')}")

③判断一个字符串是否为回文串

代码:

#判断一个字符串是否为回文串def is_palindrome(s):    """    判断一个字符串是否为回文串.    Args:        s: 待判断的字符串.    Returns:        如果是回文串,返回True;否则返回False.    """    s = s.lower() # 忽略大小写    return s == s[::-1]print(f"'madam' 是否为回文串:{is_palindrome('madam')}")print(f"'racecar' 是否为回文串:{is_palindrome('racecar')}")print(f"'hello' 是否为回文串:{is_palindrome('hello')}")

④提取字符串中的数字或字母

代码:

#提取字符串中的数字或字母def extract_digits(s):    """    提取字符串中的数字.    Args:        s: 待提取的字符串.    Returns:        提取到的数字组成的字符串.    """    digits = ""    for c in s:        if c.isdigit(): # 检查是否为数字            digits += c    return digitsprint(f"提取 'abc123def456' 中的数字:{extract_digits('abc123def456')}")

7 应用场景

  • 文本处理   
  • 数据清洗   
  • 网络编程   
  • 用户界面   
  • 日志记录   

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  1. CONNECT:[ UseTime:0.001062s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001714s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000737s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000697s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001350s ]
  6. SELECT * FROM `set` [ RunTime:0.000547s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001476s ]
  8. SELECT * FROM `article` WHERE `id` = 510175 LIMIT 1 [ RunTime:0.001056s ]
  9. UPDATE `article` SET `lasttime` = 1787301512 WHERE `id` = 510175 [ RunTime:0.033472s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000637s ]
  11. SELECT * FROM `article` WHERE `id` < 510175 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001157s ]
  12. SELECT * FROM `article` WHERE `id` > 510175 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001167s ]
  13. SELECT * FROM `article` WHERE `id` < 510175 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002152s ]
  14. SELECT * FROM `article` WHERE `id` < 510175 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002101s ]
  15. SELECT * FROM `article` WHERE `id` < 510175 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004558s ]
0.219787s