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Python 内置函数系列:s开头系列函数下篇

  • 2026-01-29 18:14:06
Python 内置函数系列:s开头系列函数下篇

@staticmethod:静态方法的"装饰器"

1. 基础用法:创建静态方法

class MathUtils:
    @staticmethod

    def
 add(a, b):
        """静态方法 - 不依赖实例"""

        return
 a + b

    @staticmethod

    def
 multiply(a, b):
        return
 a * b

    def
 instance_method(self):
        """实例方法"""

        return
 "这是实例方法"

# 使用静态方法

print
(f"加法: {MathUtils.add(5, 3)}")        # 通过类调用
print
(f"乘法: {MathUtils.multiply(5, 3)}")

# 也可以通过实例调用

utils = MathUtils()
print
(f"通过实例调用: {utils.add(2, 3)}")

2. 实际应用:工具类设计

class StringUtils:
    @staticmethod

    def
 is_palindrome(text):
        """检查回文"""

        cleaned = ''.join(c.lower() for c in text if c.isalnum())
        return
 cleaned == cleaned[::-1]

    @staticmethod

    def
 count_vowels(text):
        """统计元音字母"""

        vowels = 'aeiouAEIOU'
        return
 sum(1 for char in text if char in vowels)

    @staticmethod

    def
 safe_convert_to_int(value, default=0):
        """安全转换为整数"""

        try
:
            return
 int(value)
        except
 (ValueError, TypeError):
            return
 default

# 使用示例

text = "A man a plan a canal Panama"
print
(f"是回文: {StringUtils.is_palindrome(text)}")
print
(f"元音数量: {StringUtils.count_vowels(text)}")
print
(f"安全转换: {StringUtils.safe_convert_to_int('123')}")

str():字符串转换的"翻译官"

1. 基础用法:对象转字符串

# 基本类型转换
print
(f"数字转字符串: {str(123)}")        # 输出: "123"
print
(f"浮点数转字符串: {str(3.14)}")    # 输出: "3.14"
print
(f"布尔值转字符串: {str(True)}")    # 输出: "True"

# 列表转字符串

numbers = [1, 2, 3]
print
(f"列表转字符串: {str(numbers)}")    # 输出: "[1, 2, 3]"

# 自定义对象

class
 Person:
    def
 __init__(self, name, age):
        self
.name = name
        self
.age = age

    def
 __str__(self):
        return
 f"Person: {self.name}, {self.age}岁"

person = Person("张三", 25)
print
(f"对象转字符串: {str(person)}")

2. 实际应用:格式化输出

class StringFormatter:
    @staticmethod

    def
 format_currency(amount):
        """格式化货币"""

        return
 f"¥{amount:,.2f}"

    @staticmethod

    def
 truncate_text(text, max_length, suffix="..."):
        """截断文本"""

        if
 len(text) <= max_length:
            return
 text
        return
 text[:max_length - len(suffix)] + suffix

    @staticmethod

    def
 safe_string_conversion(obj, default=""):
        """安全字符串转换"""

        try
:
            return
 str(obj)
        except
:
            return
 default

# 使用示例

formatter = StringFormatter()

print
(f"货币格式: {formatter.format_currency(1234.567)}")
print
(f"文本截断: {formatter.truncate_text('这是一段很长的文本需要截断', 10)}")

# 安全转换

class
 ProblematicObject:
    def
 __str__(self):
        raise
 Exception("转换错误")

safe_str = formatter.safe_string_conversion(ProblematicObject())
print
(f"安全转换结果: {safe_str}")

sum():数值求和的"计算器"

1. 基础用法:可迭代对象求和

# 基本求和
numbers = [1, 2, 3, 4, 5]
total = sum(numbers)
print
(f"列表求和: {total}")  # 输出: 15

# 指定起始值

numbers = [1, 2, 3]
total_from_10 = sum(numbers, 10)
print
(f"从10开始求和: {total_from_10}")  # 输出: 16

# 元组求和

tuple_data = (10, 20, 30)
tuple_sum = sum(tuple_data)
print
(f"元组求和: {tuple_sum}")  # 输出: 60

2. 实际应用:统计计算

class StatisticsCalculator:
    @staticmethod

    def
 calculate_average(numbers):
        """计算平均值"""

        if
 not numbers:
            return
 0
        return
 sum(numbers) / len(numbers)

    @staticmethod

    def
 weighted_sum(values, weights):
        """加权求和"""

        if
 len(values) != len(weights):
            raise
 ValueError("值和权重长度必须相同")
        return
 sum(v * w for v, w in zip(values, weights))

    @staticmethod

    def
 cumulative_sum(numbers):
        """计算累加和"""

        result = []
        current_sum = 0
        for
 num in numbers:
            current_sum += num
            result.append(current_sum)
        return
 result

# 使用示例

calc = StatisticsCalculator()

data = [10, 20, 30, 40, 50]
print
(f"平均值: {calc.calculate_average(data)}")

values = [1, 2, 3]
weights = [0.1, 0.2, 0.7]
print
(f"加权和: {calc.weighted_sum(values, weights)}")

print
(f"累加和: {calc.cumulative_sum(data)}")

super():继承调用的"超级代理"

1. 基础用法:调用父类方法

class Animal:
    def
 __init__(self, name):
        self
.name = name

    def
 speak(self):
        return
 "动物叫声"

class
 Dog(Animal):
    def
 __init__(self, name, breed):
        super
().__init__(name)  # 调用父类构造器
        self
.breed = breed

    def
 speak(self):
        base_sound = super().speak()  # 调用父类方法
        return
 f"{base_sound} - 汪汪!"

# 使用示例

dog = Dog("旺财", "金毛")
print
(f"狗的名字: {dog.name}")
print
(f"狗的品种: {dog.breed}")
print
(f"狗的叫声: {dog.speak()}")

2. 实际应用:多重继承和方法重写

class Logger:
    def
 log(self, message):
        print
(f"日志: {message}")

class
 Database:
    def
 save(self, data):
        print
(f"保存数据: {data}")

class
 UserService(Logger, Database):
    def
 __init__(self, username):
        self
.username = username

    def
 create_user(self):
        # 调用Logger的方法

        super
().log(f"创建用户: {self.username}")
        # 调用Database的方法

        super
().save(f"用户数据: {self.username}")
        return
 f"用户 {self.username} 创建成功"

# 使用示例

service = UserService("张三")
result = service.create_user()
print
(result)

# 方法解析顺序查看

print
(f"方法解析顺序: {UserService.__mro__}")

总结

通过本文的详细解析,我们深入了解了Python中八个重要的内置功能:

  1. 1. @staticmethod - 静态方法装饰器,工具函数、数学计算、格式转换
  2. 2. str() - 字符串转换,日志输出、数据展示、格式化
  3. 3. sum() - 数值求和,统计计算、数值汇总、数据分析
  4. 4. super() - 父类方法调用,继承体系、方法重写、代码复用

关键知识点总结:

  • • @staticmethod创建不依赖实例的静态方法
  • • str()将对象转换为可读字符串
  • • sum()计算可迭代对象的总和
  • • super()调用父类方法,支持多重继承

版本兼容性提醒:

  • • Python 3.8+:sum()支持start关键字参数
  • • Python 3.10+:super()在零参数形式下的改进

阅读推荐

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  1. CONNECT:[ UseTime:0.001016s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001517s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000649s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000616s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001477s ]
  6. SELECT * FROM `set` [ RunTime:0.000991s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001331s ]
  8. SELECT * FROM `article` WHERE `id` = 468841 LIMIT 1 [ RunTime:0.006549s ]
  9. UPDATE `article` SET `lasttime` = 1770484927 WHERE `id` = 468841 [ RunTime:0.005209s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000697s ]
  11. SELECT * FROM `article` WHERE `id` < 468841 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001119s ]
  12. SELECT * FROM `article` WHERE `id` > 468841 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007557s ]
  13. SELECT * FROM `article` WHERE `id` < 468841 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008162s ]
  14. SELECT * FROM `article` WHERE `id` < 468841 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005633s ]
  15. SELECT * FROM `article` WHERE `id` < 468841 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005073s ]
0.214856s