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Python 3 入门与进阶(七):函数定义与使用

  • 2026-02-05 00:49:21
Python 3 入门与进阶(七):函数定义与使用

大家好,我是煜道。

今天我们一起来学习 函数定义与使用

引言

函数是组织代码的基本单元,它将复杂的逻辑封装为可重用的代码块。良好的函数设计遵循"单一职责原则"——每个函数只做一件事。在Python中,函数是一等公民,这意味着函数可以作为参数传递、作为返回值、从另一个函数返回,甚至可以赋值给变量。

本文将深入探讨Python函数的各个方面,包括函数定义、参数传递、返回值、作用域、闭包。通过系统学习,我们将能够编写出模块化、可维护的Python代码。

01 函数的基本概念

1.1 函数的定义

# 基本函数定义defgreet(name):"""向用户打招呼的函数"""returnf"Hello, {name}!"# 函数调用message = greet("Python")print(message)  # Hello, Python!# 查看函数文档print(greet.__doc__)

1.2 函数的特性

# 函数是对象defadd(a, b):return a + bprint(type(add))          # <class 'function'>print(add.__name__)       # 'add'print(add(23))          # 5# 函数可以赋值给变量func = addprint(func(23))         # 5# 函数可以作为参数传递defapply_operation(a, b, op):return op(a, b)result = apply_operation(53, add)print(result)             # 8# 函数可以作为返回值defget_operation(op_name):    operations = {'add'lambda a, b: a + b,'sub'lambda a, b: a - b,'mul'lambda a, b: a * b    }return operations.get(op_name, None)add_func = get_operation('add')print(add_func(23))     # 5

02 函数参数详解

2.1 位置参数

defdescribe_pet(name, age):"""描述宠物信息"""returnf"{name} is {age} years old"# 位置参数调用print(describe_pet("Dog"3))           # Dog is 3 years oldprint(describe_pet("Cat"2))           # Cat is 2 years old

2.2 关键字参数

# 关键字参数调用print(describe_pet(age=3, name="Dog"))  # 顺序可不同# 位置参数和关键字参数混合print(describe_pet("Dog", age=3))       # 位置在前,关键字在后

2.3 默认参数

defgreet(name, greeting="Hello"):"""带默认参数值的函数"""returnf"{greeting}{name}!"print(greet("Python"))           # Hello, Python!print(greet("Python""Hi"))     # Hi, Python!# 默认参数的注意事项defappend_to_list(item, lst=[]):# 危险!默认参数是可变对象    lst.append(item)return lst# 正确做法defappend_to_list_fixed(item, lst=None):if lst isNone:        lst = []    lst.append(item)return lst

2.4 可变参数

# *args - 收集位置参数为元组defsum_numbers(*args):    total = 0for num in args:        total += numreturn totalprint(sum_numbers(12345))  # 15# **kwargs - 收集关键字参数为字典defprint_info(**kwargs):for key, value in kwargs.items():        print(f"{key}{value}")print_info(name="Python", version=3.12, type="language")# name: Python# version: 3.12# type: language

2.5 参数组合使用

deffunc(pos1, pos2, *args, kw1="default", **kwargs):    print(f"pos1: {pos1}, pos2: {pos2}")    print(f"args: {args}")    print(f"kw1: {kw1}")    print(f"kwargs: {kwargs}")func(12345, kw1="custom", extra="value")# pos1: 1, pos2: 2# args: (3, 4, 5)# kw1: custom# kwargs: {'extra': 'value'}

2.6 Python 3.12的参数语法改进

Python 3.12引入了PEP 695的语法改进:

# Python 3.12之前defgreet(name: str, greeting: str = "Hello") -> str:returnf"{greeting}{name}!"# Python 3.12(简化泛型语法)defgreet[T](name: T, greeting: str = "Hello") -> str:returnf"{greeting}{name}!"

03 返回值

3.1 返回单个值

defadd(a, b):return a + bresult = add(34)print(result)  # 7

3.2 返回多个值

defget_min_max(numbers):return min(numbers), max(numbers)# 返回的是元组result = get_min_max([31415926])print(result)  # (1, 9)min_val, max_val = result  # 解包

3.3 隐式返回None

defno_return():    print("This function doesn't return anything")result = no_return()  # This function doesn't return anythingprint(result)          # None

04 作用域与命名空间

4.1 LEGB规则

Python按照LEGB规则查找变量:

  • Local:函数内部局部作用域。
  • Enclosing:嵌套函数的外层函数作用域。
  • Global:模块全局作用域。
  • Built-in:Python内置作用域。
# 内置作用域print(len([123]))  # len是内置函数# 全局作用域x = "global"defouter():# 闭包作用域    x = "enclosing"definner():# 局部作用域        x = "local"        print(x)  # local    inner()    print(x)  # enclosingouter()print(x)  # global

4.2 global关键字

counter = 0defincrement():global counter    counter += 1    print(f"Counter: {counter}")increment()  # Counter: 1increment()  # Counter: 2print(counter)  # 2

4.3 nonlocal关键字

defouter():    count = 0definner():nonlocal count        count += 1return countreturn innerf = outer()print(f())  # 1print(f())  # 2print(f())  # 3

05 闭包

5.1 闭包的定义

闭包是由函数及其相关的引用环境组合而成的实体。 当一个函数引用了外部作用域的变量时,就形成了闭包。

defmake_counter():    count = 0defcounter():nonlocal count        count += 1return countreturn counter# 创建计数器counter1 = make_counter()counter2 = make_counter()print(counter1())  # 1print(counter1())  # 2print(counter2())  # 1(独立的闭包环境)

5.2 闭包的应用

# 工厂函数defmake_power(exponent):defpower(base):return base ** exponentreturn powersquare = make_power(2)cube = make_power(3)print(square(5))  # 25print(cube(5))    # 125# 带状态的函数defmake_average():    total = 0    count = 0defaverage(new_value):nonlocal total, count        total += new_value        count += 1return total / count if count > 0else0return averageavg = make_average()print(avg(10))  # 10.0print(avg(20))  # 15.0print(avg(30))  # 20.0

06 特殊函数类型

6.1 匿名函数(lambda)

# lambda表达式add = lambda a, b: a + bprint(add(23))  # 5# 与高阶函数配合numbers = [12345]squares = list(map(lambda x: x**2, numbers))print(squares)  # [1, 4, 9, 16, 25]# 排序keypoints = [(12), (31), (50)]points.sort(key=lambda p: p[1])print(points)  # [(5, 0), (3, 1), (1, 2)]

6.2 高阶函数

# 接受函数作为参数defapply_twice(func, value):return func(func(value))defadd_five(x):return x + 5print(apply_twice(add_five, 10))  # 20# 返回函数defmake_multiplier(factor):defmultiplier(x):return x * factorreturn multiplierdouble = make_multiplier(2)triple = make_multiplier(3)print(double(7))   # 14print(triple(7))   # 21

6.3 内置高阶函数

numbers = [12345]squared = list(map(lambda x: x**2, numbers))print(squared)# filtereven = list(filter(lambda x: x % 2 == 0, numbers))print(even)# reducefrom functools import reducetotal = reduce(lambda x, y: x + y, numbers)print(total)# sorted(返回新列表)sorted_list = sorted(numbers, reverse=True)sorted_by_abs = sorted([-12-34], key=abs)print(sorted_list)print(sorted_by_abs)

07 函数装饰器

7.1 基本装饰器

装饰器是修改函数行为的语法糖:

defmy_decorator(func):defwrapper(*args, **kwargs):        print("调用前处理")        result = func(*args, **kwargs)        print("调用后处理")return resultreturn wrapper@my_decoratordefsay_hello():    print("Hello!")say_hello()# 调用前处理# Hello!# 调用后处理

7.2 带参数的装饰器

defrepeat(times):defdecorator(func):defwrapper(*args, **kwargs):for _ in range(times):                result = func(*args, **kwargs)return resultreturn wrapperreturn decorator@repeat(3)defgreet(name):    print(f"Hello, {name}!")greet("Python")# Hello, Python!# Hello, Python!# Hello, Python!

7.3 使用functools.wraps

import functoolsdefmy_decorator(func):    @functools.wraps(func)defwrapper(*args, **kwargs):"""包装后函数的注释文档"""return func(*args, **kwargs)return wrapper@my_decoratordeforiginal():"""原始的函数注释文档"""passprint(original.__name__)  # 'original'(而非'wrapper')print(original.__doc__)   # 'Original function docstring'

7.4 常见装饰器示例

import functoolsimport time# 计时装饰器deftimer(func):    @functools.wraps(func)defwrapper(*args, **kwargs):        start = time.time()        result = func(*args, **kwargs)        end = time.time()        print(f"{func.__name__} 花费 {end - start:.4f} 秒")return resultreturn wrapper# 缓存装饰器defcache(func):    cache_dict = {}    @functools.wraps(func)defwrapper(*args):if args in cache_dict:return cache_dict[args]        result = func(*args)        cache_dict[args] = resultreturn resultreturn wrapper# 验证装饰器defvalidate_args(func):    @functools.wraps(func)defwrapper(*args, **kwargs):# 示例:验证所有参数为数字for arg in args:ifnot isinstance(arg, (int, float)):raise TypeError("参数必须是数字")return func(*args, **kwargs)return wrapper

08 小结

本文系统介绍了Python函数的各个方面:

  1. 函数定义与调用:函数作为对象,函数名、参数、返回值。
  2. 参数类型:位置参数、关键字参数、默认参数、可变参数。
  3. 作用域规则:LEGB规则,global和nonlocal关键字。
  4. 闭包:闭包的定义、实现原理和应用场景。
  5. 特殊函数:lambda表达式、高阶函数、内置函数。
  6. 装饰器:装饰器的定义、使用方法和使用场景。

函数是Python编程的核心概念之一。掌握函数的定义、参数传递、作用域等知识,对于编写清晰、可维护的代码至关重要。

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  1. CONNECT:[ UseTime:0.000513s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000869s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.012085s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.009703s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000611s ]
  6. SELECT * FROM `set` [ RunTime:0.000222s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000608s ]
  8. SELECT * FROM `article` WHERE `id` = 471273 LIMIT 1 [ RunTime:0.029668s ]
  9. UPDATE `article` SET `lasttime` = 1770443445 WHERE `id` = 471273 [ RunTime:0.032239s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003946s ]
  11. SELECT * FROM `article` WHERE `id` < 471273 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002552s ]
  12. SELECT * FROM `article` WHERE `id` > 471273 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005526s ]
  13. SELECT * FROM `article` WHERE `id` < 471273 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004972s ]
  14. SELECT * FROM `article` WHERE `id` < 471273 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000828s ]
  15. SELECT * FROM `article` WHERE `id` < 471273 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000706s ]
0.174691s