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零基础学Python:初学者学Python函数,入手的几个核心要点!

  • 2026-02-06 12:59:18
零基础学Python:初学者学Python函数,入手的几个核心要点!
对于初学者,学习Python函数时,建议从以下几个核心要点入手,掌握函数的基本知识体系。
相关链接:零基础学Python】第九课:编程效率翻倍神器—  函数(function)
【零基础学Python】第十课:探索Python编程利器— 函数(扩展)
1. 函数定义
# 定义一个函数def func_name(参数):   # 参数可选  函数体  return 返回值   # 可选
要点:
  • def关键字:函数定义的开始

  • 函数命名:使用小写字母和下划线(func_name)

  • 冒号和缩进:函数体必须缩进

  • return语句:返回结果,若无return则返回None

2. 函数参数
# 位置参数def greet(name, greeting):    return f"{greeting}{name}!"# 默认参数def greet(name, greeting="Hello"):    return f"{greeting}{name}!"# 关键字参数greet(greeting="Hi", name="Alice")# 可变参数def sum_all(*args):  # 接收任意数量的位置参数    return sum(args)def print_info(**kwargs):  # 接收任意数量的关键字参数    for key, value in kwargs.items():        print(f"{key}{value}")
3. 函数返回值
# 单个返回值def add(a, b):    return a + b# 多个返回值(实际上返回元组)def get_coordinates():    x = 10    y = 20    return x, y  # 等价于 return (x, y)# 无返回值def print_hello():    print("Hello")    # 隐式返回 None
4. 函数作用域
函数作用域的优先级(LEGB原则):
L(local)>  E(enclosing)> G(global)> B(build-in)
示例代码:
a = int(3.14)  # 内置作用域 Bb = 11  #  全局作用域 Gdef outer():  C = 5   # 嵌套的父级函数的局部变量 E  def inner():    d = 6  # 局部作用域 L    return 1
注意点:在函数内部无法直接修改全局变量,如果修改需在函数中进行全局变量的声明。
示例代码:
count = 10   # 定义一个全局变量def func():  count = 5  # 定义了一个局部变量  print(count)func()   # 输出:5print(count)   # 输出:10
count=10def func():    global count  # 对全局变量声明    count=5    print(count)func()   # 输出:5print(count)  # 输出:5
5. 学习建议和注意事项
5.1  初学者常见误区
  • 忘记冒号:def语句后必须有冒号

  • 缩进错误:函数体必须正确缩进

  • 参数顺序:位置参数必须在关键字参数之前

  • 默认参数陷阱:默认参数应为不可变对象

# 错误的默认参数使用def append_to_list(item, my_list=[]):  # 危险!    my_list.append(item)    return my_list# 正确的做法def append_to_list(item, my_list=None):    if my_list is None:        my_list = []    my_list.append(item)    return my_list

5.2 学习路径建议

5.3 实践练习建议
  • 从简单函数开始,如计算器函数

  • 练习使用不同类型的参数

  • 理解return和print的区别

  • 尝试函数组合使用

示例代码:

def debug_function(x, y):    print(f"输入: x={x}, y={y}")  # 调试输出    result = x * y    print(f"结果: {result}")  # 调试输出    return result
总结:函数是代码重用的基本单元,熟练使用函数是成为合格程序员的关键一步。多写、多练、多思考,你会很快掌握这一重要概念!
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  1. CONNECT:[ UseTime:0.000489s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000713s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000314s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000238s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000493s ]
  6. SELECT * FROM `set` [ RunTime:0.000219s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000608s ]
  8. SELECT * FROM `article` WHERE `id` = 466247 LIMIT 1 [ RunTime:0.002125s ]
  9. UPDATE `article` SET `lasttime` = 1770491237 WHERE `id` = 466247 [ RunTime:0.009199s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000359s ]
  11. SELECT * FROM `article` WHERE `id` < 466247 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001208s ]
  12. SELECT * FROM `article` WHERE `id` > 466247 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003419s ]
  13. SELECT * FROM `article` WHERE `id` < 466247 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008274s ]
  14. SELECT * FROM `article` WHERE `id` < 466247 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012081s ]
  15. SELECT * FROM `article` WHERE `id` < 466247 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014293s ]
0.123968s