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Python 内置函数系列:t开头系列函数

  • 2026-01-29 18:09:03
Python 内置函数系列:t开头系列函数

tuple():不可变序列的"保险箱"

1. 基础用法:创建不可变序列

tuple()函数用于创建元组,这是一种不可变的序列类型,适合存储不应修改的数据。

# 从列表创建元组
list_data = [1, 2, 3, 4, 5]
tuple_from_list = tuple(list_data)
print
(f"列表转元组: {tuple_from_list}")  # 输出: (1, 2, 3, 4, 5)

# 从字符串创建(字符元组)

string_data = "hello"
tuple_from_string = tuple(string_data)
print
(f"字符串转元组: {tuple_from_string}")  # 输出: ('h', 'e', 'l', 'l', 'o')

# 从范围对象创建

range_data = range(5)
tuple_from_range = tuple(range_data)
print
(f"范围转元组: {tuple_from_range}")  # 输出: (0, 1, 2, 3, 4)

# 空元组

empty_tuple = tuple()
print
(f"空元组: {empty_tuple}")  # 输出: ()

# 从字典创建(只获取键)

dict_data = {'a': 1, 'b': 2, 'c': 3}
tuple_from_dict = tuple(dict_data)
print
(f"字典键元组: {tuple_from_dict}")  # 输出: ('a', 'b', 'c')

2. 实际应用:数据保护和多返回值

class DataProcessor:
    @staticmethod

    def
 get_coordinates():
        """返回坐标(使用元组保护数据)"""

        return
 (10.5, 20.3)  # 不可修改的坐标

    @staticmethod

    def
 get_student_info():
        """返回学生信息(多返回值)"""

        name = "张三"
        age = 20
        grade = 90.5
        return
 (name, age, grade)  # 打包返回

    @staticmethod

    def
 process_data(*args):
        """处理可变数量参数"""

        return
 tuple(args)  # 转换为元组

    @staticmethod

    def
 create_immutable_config(config_dict):
        """创建不可变配置"""

        return
 tuple(config_dict.items())

# 使用示例

processor = DataProcessor()

# 获取坐标(不可修改)

coords = processor.get_coordinates()
print
(f"坐标: {coords}")
print
(f"X坐标: {coords[0]}")
print
(f"Y坐标: {coords[1]}")

# 多返回值解包

name, age, grade = processor.get_student_info()
print
(f"学生: {name}, 年龄: {age}, 成绩: {grade}")

# 处理可变参数

data_tuple = processor.process_data(1, 2, 3, 4, 5)
print
(f"处理结果: {data_tuple}")

# 不可变配置

config = {"host": "localhost", "port": 8080, "debug": True}
immutable_config = processor.create_immutable_config(config)
print
(f"配置元组: {immutable_config}")

type():类型操作的"透视镜"

1. 单参数形式:类型检测

type()函数的单参数形式用于获取对象的类型。

# 基本类型检测
print
(f"整数的类型: {type(42)}")          # 输出: <class 'int'>
print
(f"字符串的类型: {type('hello')}")    # 输出: <class 'str'>
print
(f"列表的类型: {type([1, 2, 3])}")    # 输出: <class 'list'>
print
(f"元组的类型: {type((1, 2, 3))}")   # 输出: <class 'tuple'>

# 自定义类的类型

class
 Person:
    pass


person = Person()
print
(f"自定义类的类型: {type(person)}")  # 输出: <class '__main__.Person'>

# 与__class__比较

print
(f"type与__class__相同: {type(person) == person.__class__}")  # 输出: True

# 类型比较

num = 100
print
(f"num是整数: {type(num) == int}")      # 输出: True
print
(f"num是字符串: {type(num) == str}")    # 输出: False

2. 实际应用:动态类型检查和验证

class TypeChecker:
    @staticmethod

    def
 safe_operation(value, operation):
        """安全的类型化操作"""

        value_type = type(value)

        if
 value_type in (int, float):
            return
 operation(value)
        else
:
            return
 f"不支持的类型: {value_type}"

    @staticmethod

    def
 filter_by_type(data, target_type):
        """按类型过滤数据"""

        return
 [item for item in data if type(item) == target_type]

    @staticmethod

    def
 validate_input(value, expected_type, default=None):
        """验证输入类型"""

        if
 type(value) == expected_type:
            return
 value
        elif
 default is not None:
            return
 default
        else
:
            raise
 TypeError(f"期望类型: {expected_type}, 实际类型: {type(value)}")

# 使用示例

checker = TypeChecker()

# 安全操作

print
(f"安全计算: {checker.safe_operation(10, lambda x: x * 2)}")
print
(f"安全计算: {checker.safe_operation('text', lambda x: x * 2)}")

# 类型过滤

mixed_data = [1, "hello", 3.14, "world", 5, 6.28]
numbers_only = checker.filter_by_type(mixed_data, int)
floats_only = checker.filter_by_type(mixed_data, float)
print
(f"整数: {numbers_only}")
print
(f"浮点数: {floats_only}")

# 输入验证

try
:
    valid = checker.validate_input(100, int, 0)
    print
(f"验证通过: {valid}")

    invalid = checker.validate_input("100", int, 0)
    print
(f"验证结果: {invalid}")
except
 TypeError as e:
    print
(f"验证失败: {e}")

type():动态类创建的"造物主"

1. 三参数形式:动态创建类

type()函数的三参数形式用于在运行时动态创建类,这是Python元编程的核心功能。

# 动态创建简单类
# 等效于: class Person: pass

Person = type('Person', (), {})
person1 = Person()
print
(f"动态创建的类: {Person}")
print
(f"类名: {Person.__name__}")
print
(f"实例: {person1}")

# 带属性的类

Student = type('Student', (), {
    'name'
: '张三',
    'age'
: 20,
    'greet'
: lambda self: f"你好,我是{self.name}"
})
student1 = Student()
print
(f"学生姓名: {student1.name}")
print
(f"问候: {student1.greet()}")

# 带继承的类

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

# 动态创建继承类

Dog = type('Dog', (Animal,), {
    'breed'
: '金毛',
    'bark'
: lambda self: f"{self.breed}在汪汪叫"
})
dog1 = Dog()
print
(f"狗的品种: {dog1.breed}")
print
(f"狗叫: {dog1.bark()}")
print
(f"动物方法: {dog1.speak()}")

2. 实际应用:元编程和动态类生成

class DynamicClassFactory:
    @staticmethod

    def
 create_class(class_name, base_classes=(), attributes=None, methods=None):
        """动态创建类"""

        class_dict = {}

        # 添加属性

        if
 attributes:
            class_dict.update(attributes)

        # 添加方法

        if
 methods:
            for
 method_name, method_func in methods.items():
                class_dict[method_name] = method_func

        # 创建类

        new_class = type(class_name, base_classes, class_dict)
        return
 new_class

    @staticmethod

    def
 create_data_class(class_name, field_names):
        """创建类似数据类的简单类"""

        class_dict = {'__slots__': field_names}

        # 添加初始化方法

        def
 init_method(self, *args):
            for
 field, value in zip(field_names, args):
                setattr
(self, field, value)

        class_dict['__init__'] = init_method

        # 添加字符串表示

        def
 repr_method(self):
            fields = ', '.join(f'{field}={getattr(self, field)}'
                              for
 field in field_names)
            return
 f'{class_name}({fields})'

        class_dict['__repr__'] = repr_method

        return
 type(class_name, (), class_dict)

    @staticmethod

    def
 add_method_to_class(cls, method_name, method_func):
        """向现有类添加方法"""

        setattr
(cls, method_name, method_func)
        return
 cls

# 使用示例

factory = DynamicClassFactory()

# 创建数据类

Point = factory.create_data_class('Point', ['x', 'y', 'z'])
point = Point(1, 2, 3)
print
(f"点对象: {point}")
print
(f"点坐标: ({point.x}, {point.y}, {point.z})")

# 创建复杂类

Calculator = factory.create_class(
    'Calculator'
,
    (),
    {
        'version'
: '1.0',
        'description'
: '简单的计算器类'
    },
    {
        'add'
: lambda self, a, b: a + b,
        'multiply'
: lambda self, a, b: a * b
    }
)

calc = Calculator()
print
(f"计算器版本: {calc.version}")
print
(f"加法: {calc.add(5, 3)}")
print
(f"乘法: {calc.multiply(5, 3)}")

# 动态添加方法

def
 power_method(self, base, exp):
    return
 base ** exp

Calculator = factory.add_method_to_class(Calculator, 'power', power_method)
print
(f"幂运算: {calc.power(2, 3)}")

总结

本文的详细解析了Python中两个重要的内置功能:

  1. 1. tuple(iterable) - 不可变序列的保险箱
  2. 2. type(object) - 类型检测的透视镜
  3. 3. type(name, bases, dict) - 动态类创建的造物主

关键知识点总结:

  • • tuple()创建不可变序列,适合保护数据不被修改
  • • type()单参数形式返回对象类型,三参数形式动态创建类
  • • 动态类创建是Python元编程的核心,允许运行时定义类结构

实用场景推荐:

  • • tuple():多返回值、配置存储、字典键、数据保护
  • • type():类型检查、动态验证、元编程、插件系统
  • • 动态类创建:ORM框架、API生成、代码生成、动态行为

这两个功能代表了Python在不同层面的强大能力:tuple()体现了数据封装的简洁性,type()展示了动态语言的灵活性。掌握它们能够帮助你编写出更加安全、灵活和高效的Python代码,从简单的数据封装到复杂的元编程,为各种编程场景提供了强大的支持。

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  1. CONNECT:[ UseTime:0.000706s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000837s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000409s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000273s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000536s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000566s ]
  8. SELECT * FROM `article` WHERE `id` = 469313 LIMIT 1 [ RunTime:0.001165s ]
  9. UPDATE `article` SET `lasttime` = 1770534863 WHERE `id` = 469313 [ RunTime:0.006233s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000267s ]
  11. SELECT * FROM `article` WHERE `id` < 469313 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000423s ]
  12. SELECT * FROM `article` WHERE `id` > 469313 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000434s ]
  13. SELECT * FROM `article` WHERE `id` < 469313 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002475s ]
  14. SELECT * FROM `article` WHERE `id` < 469313 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000953s ]
  15. SELECT * FROM `article` WHERE `id` < 469313 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004846s ]
0.092639s