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Python 内置函数系列:v开头系列函数

  • 2026-02-06 04:27:34
Python 内置函数系列:v开头系列函数

vars():对象属性的"字典视图"

1. 基础用法:获取对象的属性字典

vars()函数返回对象的__dict__属性,提供了对对象内部属性的字典式访问。

# 创建简单类
class
 Person:
    def
 __init__(self, name, age):
        self
.name = name
        self
.age = age

# 创建实例

person = Person("张三", 25)

# 使用vars()获取属性字典

attributes = vars(person)
print
(f"对象属性字典: {attributes}")  # 输出: {'name': '张三', 'age': 25}

# 修改属性字典会影响原对象

attributes['age'] = 30
print
(f"修改后年龄: {person.age}")  # 输出: 30

# 添加新属性

attributes['city'] = '北京'
print
(f"新属性城市: {person.city}")  # 输出: 北京

# 直接访问__dict__属性

print
(f"直接访问: {person.__dict__}")  # 与vars()相同

2. 无参数调用:类似locals()的行为

def demonstrate_vars():
    """演示函数内无参数调用vars()"""

    x = 10
    y = 20
    z = "hello"

    # 无参数调用,类似locals()

    local_vars = vars()  # 等同于 locals()
    print
(f"局部变量: {local_vars}")

    # 动态添加变量

    local_vars['new_var'] = "动态添加"
    print
(f"新变量: {new_var}")  # 可以访问

    return
 local_vars

# 函数调用

result = demonstrate_vars()
print
(f"函数返回的变量: {result}")

# 模块级别的vars()

import
 math
module_vars = vars(math)
print
(f"math模块的部分属性: {list(module_vars.keys())[:5]}")

实际应用:动态属性管理和调试

1. 属性序列化和配置管理

class ConfigObject:
    """使用vars()进行配置管理"""

    def
 __init__(self, **kwargs):
        for
 key, value in kwargs.items():
            setattr
(self, key, value)

    def
 to_dict(self):
        """转换为字典(使用vars())"""

        return
 dict(vars(self))

    def
 update_from_dict(self, config_dict):
        """从字典更新配置"""

        for
 key, value in config_dict.items():
            setattr
(self, key, value)

    def
 filter_attributes(self, prefix=None):
        """过滤特定前缀的属性"""

        all_attrs = vars(self)
        if
 prefix:
            return
 {k: v for k, v in all_attrs.items() if k.startswith(prefix)}
        return
 all_attrs

    def
 __repr__(self):
        """使用vars()生成表示字符串"""

        attrs = ', '.join(f"{k}={v!r}" for k, v in vars(self).items())
        return
 f"{self.__class__.__name__}({attrs})"

# 使用示例

config = ConfigObject(debug=True, host="localhost", port=8080, log_level="INFO")
print
(f"配置对象: {config}")

# 转换为字典

config_dict = config.to_dict()
print
(f"配置字典: {config_dict}")

# 过滤属性

debug_attrs = config.filter_attributes('debug')
print
(f"调试相关属性: {debug_attrs}")

# 动态更新

config.update_from_dict({'timeout': 30, 'max_connections': 100})
print
(f"更新后配置: {config}")

2. 高级调试和对象检查

class ObjectInspector:
    """使用vars()进行对象检查"""


    @staticmethod

    def
 inspect_object(obj, include_private=False):
        """检查对象的所有属性"""

        try
:
            obj_vars = vars(obj)
        except
 TypeError:
            return
 "该对象没有__dict__属性(可能使用了__slots__)"

        inspection = {
            'type'
: type(obj).__name__,
            'module'
: getattr(obj, '__module__', 'Unknown'),
            'attributes'
: {}
        }

        for
 attr_name, attr_value in obj_vars.items():
            # 过滤私有属性

            if
 not include_private and attr_name.startswith('_'):
                continue


            inspection['attributes'][attr_name] = {
                'value'
: attr_value,
                'type'
: type(attr_value).__name__,
                'id'
: id(attr_value)
            }

        return
 inspection

    @staticmethod

    def
 compare_objects(obj1, obj2):
        """比较两个对象的属性差异"""

        try
:
            vars1 = vars(obj1)
            vars2 = vars(obj2)
        except
 TypeError as e:
            return
 f"比较失败: {e}"

        common_keys = set(vars1.keys()) & set(vars2.keys())
        unique_to_obj1 = set(vars1.keys()) - set(vars2.keys())
        unique_to_obj2 = set(vars2.keys()) - set(vars1.keys())

        differences = {}
        for
 key in common_keys:
            if
 vars1[key] != vars2[key]:
                differences[key] = {
                    'obj1_value'
: vars1[key],
                    'obj2_value'
: vars2[key]
                }

        return
 {
            'common_attributes'
: list(common_keys),
            'unique_to_obj1'
: list(unique_to_obj1),
            'unique_to_obj2'
: list(unique_to_obj2),
            'value_differences'
: differences
        }

    @staticmethod

    def
 create_snapshot(obj):
        """创建对象状态快照"""

        try
:
            return
 {
                'timestamp'
: __import__('time').time(),
                'vars'
: dict(vars(obj)),
                'type'
: type(obj).__name__
            }
        except
 TypeError:
            return
 None

# 使用示例

inspector = ObjectInspector()

# 创建测试对象

class
 TestClass:
    def
 __init__(self):
        self
.public_attr = "公开属性"
        self
._protected_attr = "受保护属性"
        self
.__private_attr = "私有属性"
        self
.value = 42

test_obj = TestClass()

# 对象检查

inspection = inspector.inspect_object(test_obj)
print
("对象检查结果:")
for
 key, value in inspection.items():
    print
(f"  {key}: {value}")

# 包含私有属性的检查

full_inspection = inspector.inspect_object(test_obj, include_private=True)
print
(f"包含私有属性的属性数量: {len(full_inspection['attributes'])}")

# 对象比较

obj1 = TestClass()
obj2 = TestClass()
obj2.value = 100  # 修改一个属性

comparison = inspector.compare_objects(obj1, obj2)
print
("对象比较结果:")
for
 key, value in comparison.items():
    print
(f"  {key}: {value}")

总结

本文的详细解析了Python中重要的内置函数vars()

核心功能总结:

  • • vars([object])返回对象的__dict__属性
  • • 无参数调用时,在Python 3.13+中与locals()行为类似
  • • 提供对对象内部属性的字典式访问和修改

关键特性:

  • • 支持模块、类实例等有__dict__属性的对象
  • • 对于使用__slots__的类会抛出TypeError
  • • 返回的字典是实时的,修改会影响原对象
  • • 是Python自省和元编程的重要工具

实用场景推荐:

  • • 调试分析:快速查看对象的所有属性
  • • 动态编程:运行时检查和修改对象结构
  • • 序列化准备:获取可序列化的属性字典
  • • 配置管理:统一管理对象配置属性
  • • 测试验证:验证对象状态和属性值

vars()函数虽然简单,但它是理解Python对象模型和进行高级编程的重要工具。从简单的调试到复杂的元编程,掌握vars()能够帮助你更深入地理解Python的面向对象特性,编写出更加强大和灵活的程序。

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  1. CONNECT:[ UseTime:0.000832s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001131s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007759s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005148s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001266s ]
  6. SELECT * FROM `set` [ RunTime:0.003217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001347s ]
  8. SELECT * FROM `article` WHERE `id` = 470096 LIMIT 1 [ RunTime:0.034874s ]
  9. UPDATE `article` SET `lasttime` = 1770442852 WHERE `id` = 470096 [ RunTime:0.005840s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002077s ]
  11. SELECT * FROM `article` WHERE `id` < 470096 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007104s ]
  12. SELECT * FROM `article` WHERE `id` > 470096 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011450s ]
  13. SELECT * FROM `article` WHERE `id` < 470096 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.031106s ]
  14. SELECT * FROM `article` WHERE `id` < 470096 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.045431s ]
  15. SELECT * FROM `article` WHERE `id` < 470096 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.170861s ]
0.404363s