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Python学习笔记——从入门到报废(十五、函数更优雅(下))

  • 2026-04-08 22:42:18
Python学习笔记——从入门到报废(十五、函数更优雅(下))

上一章,我们介绍了快捷定义函数的lambda算子或匿名函数,以及数据类型注释的方法。这一章节,我们继续拓展,讲述更多关于让函数更优雅的内容。

一、函数嵌套

前面我们讲过,判断和循环可以嵌套,那么函数可以吗?当然是可以的。不过,函数内部的子函数是局部的,只在函数内部发挥作用。例如:

def father():    print("father", end=" ")    def child():        print("child")    child()father()# Output: father childchild()# Output: NameError: name 'child' is not defined

如果我们在函数外部调用子函数child,解释器会抛出child未定义的错误。

函数嵌套同样奉行局部优先的原则,即子函数优先于外部函数发挥作用,比如:

def power(numintexpint = 2) -> float:    print("power operation outside")    return num ** expdef square_sum(xintyint) -> float:    def power(ninteint = 2) -> float:        print("power operation inside")        return n ** e    return power(x) + power(y)print(square_sum(34))# Output:# power operation inside# power operation inside# 25

会发现,调用power函数时,其优先使用的是函数内部的同名子函数。

二、函数重载

学习过Java、C++等语言的读者可能想问,Python能不能重载?

重载(Overloading)是指对于同一个函数命名,根据传入参数的类型、数量、顺序等的不同,函数会执行不同的操作。但由于Python对参数的传递很灵活,甚至是比较随意,因此其不支持传统意义上的重载。如果你强行重载,那么就会产生程序错误。例如:

def function(num):    print(f"content: {num}")def function():    print("no content")function()# Output: no contentfunction(123)# Output: TypeError: function() takes 0 positional arguments but 1 was given

后一个function会直接覆盖前一个同名函数,使得带参数的函数无法被正确调用。

当然,你可以使用if-else等来间接实现重载:

def function(num):    if isinstance(num, int):        print("gotten an integer")    elif isinstance(num, float):        print("gotten a float")    else:        print(f"gotten a(n) {type(num)}")function(100)function(100.0)function("100")# Output:# gotten an integer# gotten a float# gotten a(n) <class 'str'>

也可以使用一些函数装饰器来辅助实现。

三、装饰器

简单地说,装饰器(Decorator)是修改其他函数的功能的函数。它们有助于让代码更简短。装饰器是很难掌握的概念,就像C语言的指针一样。因此,我们简要介绍一下,不过多展开。

前序内容,我们提到过函数可以赋值给其他变量,变成异名同效的函数,调用方法也是“变量名+括号+参数(若有)”。既然能用于赋值,那么其也能作为函数的返回值:

def function():    def laugh():        print("hahaha")    return laughcall1 = function()call1()Outputhahahacall2 = functioncall2()()Outputhahaha

也能用于传参:

def power(num, exp=2):    return num ** expdef calc(num, func):    return func(num)print(calc(2, power))# Output: 4

根据先前我们提到的装饰器的定义,我们将上面函数作为参数及返回值的内容合并起来,就可以得到一个装饰器。下面,我们给出一个示例,用于说明在用户调用某项功能时,需要先登录账号:

def login_decorator(func):    def wrapper(*args, **kwargs):        print("User has logged in")        return func(*args, **kwargs)    return wrapperdef user_call(*args, **kwargs):    print("User has called the function")

定义完成后,我们使用login_decorator来修饰user_call函数,使得其先执行登录逻辑:

call = login_decorator(user_call)call()# Output:# User has logged in# User has called the function

这样就会发现,在真正调用函数前,会先执行装饰器中定义在正式调用该函数的代码。或许你会问,这样写好像有些麻烦。其实,我们可以使用“@”来在定义函数时就对其添加装饰器,从而产生同样的效果:

@login_decoratordef user_call(*args, **kwargs):    print("User has called the function")user_call()# Output:# User has logged in# User has called the function

上面函数定义时,我们使用了“*args”和“**kwargs”:前者我们已经提到过,是不定长参数;后者则是关键词参数,即以“key=value”的形式传参,然后函数对kwargs使用字典访问的方式获取参数内容:

def function(*args, **kwargs):    print(f"*args: {args}, type: {type(args)}")    print(f"**kwargs: {kwargs}, type: {type(kwargs)}")function(123, a=4, b=5, c=6)# Output:# *args: (1, 2, 3), type: <class 'tuple'># **kwargs: {'a': 4, 'b': 5, 'c': 6}, type: <class 'dict'>

往期回顾:

绘图封神,Matplotlib全套教程|Part.1

GPU加速版Pandas!cuDF库详解,大数据处理速度直接起飞

Python学习笔记——从入门到报废(十四、函数更优雅(上))

Python学习笔记——从入门到报废(十三、函数(下))

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  1. CONNECT:[ UseTime:0.000504s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001027s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000359s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000270s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000704s ]
  6. SELECT * FROM `set` [ RunTime:0.000251s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000573s ]
  8. SELECT * FROM `article` WHERE `id` = 479707 LIMIT 1 [ RunTime:0.000532s ]
  9. UPDATE `article` SET `lasttime` = 1775661204 WHERE `id` = 479707 [ RunTime:0.010762s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000288s ]
  11. SELECT * FROM `article` WHERE `id` < 479707 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000416s ]
  12. SELECT * FROM `article` WHERE `id` > 479707 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002177s ]
  13. SELECT * FROM `article` WHERE `id` < 479707 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000877s ]
  14. SELECT * FROM `article` WHERE `id` < 479707 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000835s ]
  15. SELECT * FROM `article` WHERE `id` < 479707 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000767s ]
0.089737s