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Python优雅处理变量值交换

  • 2026-02-26 00:52:42
Python优雅处理变量值交换

最近学习Python,学到元组(tuple)使用中有个组包和解包的逻辑,发现变量值的交换,目前就只有Python是最优雅的,叹为观止!!

Python目前来看是当之无愧的明星编程语言:

下面我用我用过的五种编程语言实现两个数字交换:

1. C语言

#include<stdio.h>// 方式1:临时变量voidswap1(int* x, int* y){    int temp = *x;    *x = *y;    *y = temp;}// 方式2:加减法(注意: 可能会溢出) 算是一个比较妙的方法voidswap2(int* x, int* y){    *x = *x + *y;    *y = *x - *y;    *x = *x - *y;}// 方式3:异或(位运算)voidswap3(int* x, int* y){    *x = *x ^ *y;    *y = *x ^ *y;    *x = *x ^ *y;}intmain(){    int x = 20, y = 10;    printf("before:x=%d, y=%d\n", x, y);    // 使用了指针, 指针是C/C++令人不喜的原因之一    swap1(&x, &y); // 中间变量    // swap2(&x, &y); // 减法    // swap3(&x, &y); // 异或    printf("after:x=%d, y=%d\n", x, y);    return 0;}

2. C++语言

#include<iostream>using namespace std;// 方式1:临时变量voidswap1(int &x, int &y){    int temp = x;    x = y;    y = temp;}// 方法2:使用STL函数#include<algorithm>intmain(){    int x = 20, y = 10;    // 自定义函数    swap1(x, y);    cout<<"交换:x="<<x<<",y="<<y<<endl;    // 恢复原值    x = 20; y = 10;    // 使用STL swap    swap(x, y);    cout<<"STL交换:x="<<x<<",y="<<y<<endl;    return 0;}

3. Java语言

public class SwapTwoNumber {    // Java不能直接交换基本类型,需要包装类或数组    // 数组+临时变量    publicstaticvoidswap(int[] arrNums) {        int temp = arrNums[0];        arrNums[0] = arrNums[1];        arrNums[1] = temp;    }    // 包装类    publicstaticvoidswap(IntegerPacker x, IntegerPacker y) {        int temp = x.value;        x.value = y.value;        y.value = temp;    }    publicstaticvoidmain(String[] args) {        // 都需要一个中间变量        // 1:使用数组        int[] nums = {2010};        System.out.println("before:"+nums[0]+","+nums[1]);        swap(nums);        System.out.println("after:"+nums[0]+","+nums[1]);        // 2:使用包装类        IntegerPacker x = new IntegerPacker(20);        IntegerPacker y = new IntegerPacker(10);        System.out.println("before:x="+x.value+",y="+y.value);        swap(x, y);        System.out.println("after:x="+x.value+",y="+y.value);    }    // 辅助包装类    static class IntegerPacker {        int value;        IntegerPacker(int num) {            this.value = num;        }    }}

java代码量目前看是最多的.

4. Python语言

# 方式1:Python特有的元组解包def swap1(x, y):    return y, x# 方式2:临时变量def swap2(x, y):    temp = x    x = y    y = temp    return x, y# 方式3:加减法def swap3(x, y):    x = x + y    y = x - y    x = x - y    return x, y# 方式4:异或(只适用于整数)def swap4(x, y):    x = x ^ y    y = x ^ y    a = x ^ y    return x, y# 测试x, y = 2010print(f"before:x = {x}, y = {y}")# Python中最简单的交换方式# 使用了 元组的组包\解包, "="右边的结果是组包, "="左边再解包# 就是这么优雅x, y = y, xprint(f"after:x = {x}, y = {y}")

5. JavaScript语言

// 方法1:临时变量function swap1(x, y) {    let temp = x;    x = y;    y = temp;    return [x, y];}// 方式2:解构赋值(ES6) 这个和python 有点像了function swap2(x, y) {    [x, y] = [y, x];    return [x, y];}// 方式3:加减法function swap3(x, y) {    x = x + y;    y = x - y;    x = x - y;    return [x, y];}// 方法4:异或(只适用于数字)function swap4(x, y) {    x = x ^ y;    y = x ^ y;    x = x ^ y;    return [x, y];}// 测试let x = 20, y = 10;console.log(`before:x = ${x}, y = ${y}`);// 使用解构赋值[x, y] = [y, x];console.log(`after:x = ${x}, y = ${y}`);// 使用函数let result = swap1(2010);console.log(`after1:a = ${result[0]}, b = ${result[1]}`);

总结

不同语言实现数字交换的特点:

· C语言:需要指针操作,直接内存操作, 指针比较危险, 大多数人不喜欢

· C++:支持引用和STL,更加方便, 指针\引用等方式都可以.

· Java:没有指针,需要通过数组或对象包装,比较麻烦

· Python:语法简洁,支持元组解包, 优雅简单

· JavaScript:支持解构赋值,语法灵活

由此可见每种语言都有其独特的实现方式,反映了各自的设计哲学和语法特性。

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  1. CONNECT:[ UseTime:0.000551s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000847s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003520s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000724s ]
  6. SELECT * FROM `set` [ RunTime:0.000702s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000673s ]
  8. SELECT * FROM `article` WHERE `id` = 477143 LIMIT 1 [ RunTime:0.001966s ]
  9. UPDATE `article` SET `lasttime` = 1772233915 WHERE `id` = 477143 [ RunTime:0.000965s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000291s ]
  11. SELECT * FROM `article` WHERE `id` < 477143 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.018509s ]
  12. SELECT * FROM `article` WHERE `id` > 477143 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.029841s ]
  13. SELECT * FROM `article` WHERE `id` < 477143 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007309s ]
  14. SELECT * FROM `article` WHERE `id` < 477143 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.046057s ]
  15. SELECT * FROM `article` WHERE `id` < 477143 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.027917s ]
0.221205s