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Python的调用和传参:点、括号以及self

  • 2026-07-01 04:09:18
Python的调用和传参:点、括号以及self

1. 什么时候加 .,什么时候不加?

核心规则:. 代表“的”。当需要从某个东西(对象/模块/类)里面去拿它的零件(属性或方法)时,就必须用 .

  • 加 . 的情况
    • 访问属性/方法:比如 rect.area(获取 rect 的 area)、"hello".upper()(获取字符串的 upper 方法)、math.pi(获取 math 模块里的 pi 常量)
    • 调用实例方法:比如 rect.get_area()(调用 rect 的 get_area 方法)
  • 不加 . 的情况
    • 使用独立的全局函数或变量:比如 Python 自带的 print()len(),或者你自己直接在文件最外层定义的变量和函数。它们不属于任何特定的对象,所以直接用就行。

2. 什么时候加 (),什么时候不加?

核心规则:() 代表“动手执行”。当你希望某个函数或方法立刻开始干活并给你一个结果时,就要加括号;如果你只是想把它的名字记下来或者传给别人,就不加括号

  • 加 () 的情况(立刻执行)
    • 调用函数/方法:比如 print("你好")rect.get_area()。哪怕是 @property 装饰的方法,如果它后面有括号(比如 rect.area()),Python 也会尝试去执行它(不过对于 @property,通常不加括号,加了反而会报错,因为它已经被伪装成属性了)。
    • 实例化一个类:比如 rect = Rect(800, 200),这里的括号代表“按图纸生产一个实物”
  • 不加 () 的情况(只拿名字/引用)
    • 把函数当参数传递:比如 button.on_click(handle_click)。这里你只是告诉按钮:“被点击时,请去调用 handle_click 这个函数”,而不是现在就立刻调用它
    • 访问 @property 装饰的方法:比如 rect.area。因为 @property 的作用就是把方法伪装成普通属性,所以访问它时绝对不能加括号

3. 括号里什么时候加 self,什么时候不加?

核心规则:self 代表“我自己”。在定义实例方法时,Python 规定必须把“我自己”写在第一个位置;但在外面调用时,Python 会自动帮你塞进去,你绝对不能自己画蛇添足

  • 需要写 self 的情况(仅限定义时)
    • 在 class 内部定义普通方法时:比如 def area(self):。这里的 self 是告诉 Python:“这个方法是需要绑定到具体某个实例上的”。如果你在方法内部想用自己的属性(比如 self.width)或调用自己的其他方法(比如 self.other_func()),都必须带上 self.
  • 不需要写 self 的情况
    • @property 和普通的实例方法一样,定义时括号里要写 self
    • @staticmethod 是纯工具函数,跟具体的“我自己”没关系,所以定义时括号里不需要写 self
    • 在类外面调用方法时:比如 rect.area。虽然定义时有 self,但调用时 Python 会自动把 rect 当作 self 传进去,你写了反而会报错(提示参数给多了)
    • 定义 @property@staticmethod(静态方法)时

⚡️ 极速避坑对照表

为了方便你记忆,我把这些规则浓缩成了一张表:

场景写法示例规则说明
调用 @property 方法rect.area加点,不加括号。定义时要写 self,调用时不写
调用普通实例方法rect.get_area()加点,加括号。定义时要写 self,调用时不写
把函数当参数传递func_name不加括号。表示只传递函数的地址,不立刻执行
定义静态工具方法def add(a, b):定义时不写 self。它只是一个放在类里的普通函数
实例化一个类Rect(800, 200)加括号。括号里传的是 __init__ 方法里除了 self 以外的参数

一句话总结:用 . 拿东西,用 () 让它干活;定义方法时老实写上 self 代表“我自己”,调用方法时把 self 忘掉交给 Python 自动处理;遇到 @property 就把它当成一个普通的变量(加点、不加括号)去用就好!

class Rect:

    def __init__(self, width, height):

        self._width = width  # 内部变量通常加个下划线,表示它是受保护的

        self._height = height

    @property

    def area(self):

        return self._width * self._height

    # 这里的 width 必须和下面 setter 的名字保持一致

    @property

    def width(self):

        return self._width

    # 固定写法:@刚才的属性名.setter

    @width.setter

    def width(self, value):

        if value < 0:

            print("宽度不能为负数!")

            return

        self._width = value

rect = Rect(800, 200)

print("面积为:", rect.area)  # 像访问属性一样获取面积

rect.width = -100  # 触发 setter 里的限制逻辑,打印“宽度不能为负数!”

print("修改后的宽为:", rect.width) 

rect.width=2

print("修改后的宽为:", Rect.width) 

输出结果:

面积为: 160000 
宽度不能为负数! 
修改后的宽为: 800 
修改后的宽为: <property object at 0x000001EF7D8E9080>

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  1. CONNECT:[ UseTime:0.000648s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000894s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000310s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000239s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000450s ]
  6. SELECT * FROM `set` [ RunTime:0.000192s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000507s ]
  8. SELECT * FROM `article` WHERE `id` = 493857 LIMIT 1 [ RunTime:0.000838s ]
  9. UPDATE `article` SET `lasttime` = 1783043243 WHERE `id` = 493857 [ RunTime:0.011650s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000405s ]
  11. SELECT * FROM `article` WHERE `id` < 493857 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000611s ]
  12. SELECT * FROM `article` WHERE `id` > 493857 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000443s ]
  13. SELECT * FROM `article` WHERE `id` < 493857 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000931s ]
  14. SELECT * FROM `article` WHERE `id` < 493857 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003112s ]
  15. SELECT * FROM `article` WHERE `id` < 493857 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003468s ]
0.094312s