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第三十一课:Python函数的值传递和引用传递

  • 2026-02-01 22:57:01
第三十一课:Python函数的值传递和引用传递
Python中函数的参数传递机制都是“值传递”。所谓值传递,就是将实际参数的副本(复制品)传入函数,而参数本身不会受到任何影响。看例子:
def swap(a , b) :    # 下面代码实现a、b变量的值交换    a, b = b, a    print("swap函数里,a的值是",a, ";b的值是", b)a = 6b = 9swap(a , b)print("交换结束后,变量a的值是",a , ";变量b的值是", b)

执行过程(按值传递理解):

  1. 主程序中定义变量
    • a = 6
    • b = 9
  2. 调用swap(a, b)
    • 系统把当前 a 的值(6)和 b 的值(9)复制一份,传给函数swap
      的两个参数。
    • 也就是说,函数内部的a
      b新的局部变量,初始值分别是 6 和 9。
    • 这个过程就是值传递:实参的值被复制给形参,函数内部操作的是副本。
  3. swap函数内部执行 a, b = b, a
    • 把函数内部的
      a和 b 的值互换。
    • 此时函数内的
      a变成 9,b 变成 6。
    • 打印输出:swap函数里,a的值是 9 ;b的值是 6
  4. 函数执行结束,返回主程序
    • 函数内部的
      ab是局部变量,随着函数结束而消失。
    • 主程序中的原始变量
      a和 b从未被修改,仍然保持原来的值:6 和 9。
    • 所以最后一行输出:交换结束后,变量a的值是 6 ;变量b的值是 9
    值传递实质:实参的值被复制给形参,函数内部对形参的任何修改都不会影响主程序中的原始变量传的是值的副本,不是原始变量本身接下来是引用传递:
    def swap(dw):    # 下面代码实现dw的a、b两个元素的值交换    dw['a'], dw['b'] = dw['b'], dw['a']    print("swap函数里,a元素的值是",dw['a'], ";b元素的值是", dw['b'])    # 把dw直接赋值为None,让它不再指向任何对象    dw = Nonedw = {'a'6'b'9}swap(dw)print("交换结束后,a元素的值是",dw['a'], ";b元素的值是", dw['b'])

    第一步:主程序创建字典

    • dw = {'a': 6, 'b': 9}
    → 创建了一个字典,包含两个键值对。

    第二步:调用 swap(dw)

    • 把 dw传给函数参数 dw
    • 在 Python 中,字典是可变类型,当它作为参数传入函数时,函数内部的参数 dw 和主程序中的 dw指向同一个字典
    • 这种行为看起来像“引用传递”:函数内对字典内容的修改,会直接反映到主程序中。
    第三步:在函数内交换字典的值
    dw['a'], dw['b'] = dw['b'], dw['a']
    • 这行代码修改了字典内部的数据
      • 原来
        'a': 6'b': 9
      • 现在变成
        'a': 9'b': 6
    • 因为函数内的 dw
       和主程序的 dw指向同一个字典,所以这个修改是全局生效的
    • 打印输出
      swap函数里,a元素的值是 9 ;b元素的值是 6

    第四步:dw = None

    • 这行代码只是让函数内部的局部变量dw
      不再指向原来的字典,而是指向 None
    • 这不会影响主程序中的dw
    • 主程序中的 dw
      仍然指向那个已经被修改过的字典{'a': 9, 'b': 6}

    第五步:函数返回,执行主程序打印

    print("交换结束后,a元素的值是", dw['a'], ";b元素的值是", dw['b'])
    • 主程序的dw
      仍然是那个字典,且内容已被交换。
    • 所以输出:交换结束后,a元素的值是 9 ;b元素的值是 6

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    1. CONNECT:[ UseTime:0.000571s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000507s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000395s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003619s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
    6. SELECT * FROM `set` [ RunTime:0.000810s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000568s ]
    8. SELECT * FROM `article` WHERE `id` = 467735 LIMIT 1 [ RunTime:0.001696s ]
    9. UPDATE `article` SET `lasttime` = 1770484926 WHERE `id` = 467735 [ RunTime:0.000817s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000238s ]
    11. SELECT * FROM `article` WHERE `id` < 467735 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000583s ]
    12. SELECT * FROM `article` WHERE `id` > 467735 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003997s ]
    13. SELECT * FROM `article` WHERE `id` < 467735 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003413s ]
    14. SELECT * FROM `article` WHERE `id` < 467735 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009743s ]
    15. SELECT * FROM `article` WHERE `id` < 467735 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003888s ]
    0.206846s