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Python 如何不使用中间变量,交换两个变量的值?

  • 2026-07-01 19:28:35
Python 如何不使用中间变量,交换两个变量的值?

库存清洗脚本里看到这么一段,我第一眼就想删。

tmp = sku_asku_a = sku_bsku_b = tmp

不是它错了,是太像从 C 语言课本里搬过来的。Python 里交换两个变量,正常就写一行:

sku_a, sku_b = sku_b, sku_a

这事小,但我见过不少代码就是从这种小地方开始别扭的。一个批处理脚本,本来三十行能看完,硬是写出一堆临时变量,后面再夹几个状态字段,读代码的人就开始猜:这个 tmp 后面还会不会用?有没有被覆盖?是不是有业务含义?

没有。它只是个中间变量。

Python 交换变量靠的是“右边先算完,左边再接住”。

看这个例子:

left_box = "A1001"right_box = "B7782"left_box, right_box = right_box, left_boxprint(left_box)   # B7782print(right_box)  # A1001

执行到交换这一行时,Python 会先把右边的 right_box, left_box 取出来,形成一组值,然后再按位置塞回左边。

所以它不会出现这种问题:

left_box = right_boxright_box = left_box

这两行看着也像交换,其实已经把 left_box 原来的值弄丢了。

现场排这种问题挺烦的,日志里通常长这样:

before swap: left=A1001 right=B7782after  swap: left=B7782 right=B7782

看到两个值一样,我一般先不怀疑数据源,先搜有没有这种“手写交换”。因为这种 bug 没报错,跑得还挺安静。

我平时写批量处理脚本,经常在调整顺序时用这个写法。

比如导入一批区间配置,有人把开始时间和结束时间填反了。你不能直接让任务挂掉,有些数据可以兜一下:

deffix_time_range(row):    start_at = row["start_at"]    end_at = row["end_at"]if start_at > end_at:        start_at, end_at = end_at, start_at        row["remark"] = "time_range_fixed"    row["start_at"] = start_at    row["end_at"] = end_atreturn row

这里如果写成 tmp 也不是不行,但没必要。交换动作本身就很清楚,代码读到这里,不会多想。

再看一个更像脚本里的场景。处理接口返回的价格区间,低价高价可能被上游传反:

defnormalize_price(item):    low = int(item.get("low_price"or0)    high = int(item.get("high_price"or0)if low and high and low > high:        low, high = high, lowreturn {"sku": item["sku"],"low_price": low,"high_price": high,    }

这种代码我愿意留下。判断条件、交换动作、返回结果都贴在一起,没什么绕的。

有些人会问,既然不用中间变量,那能不能用异或交换?

a = a ^ bb = a ^ ba = a ^ b

这东西我基本不写。它只适合整数,还怕两个变量指向同一个值的特殊情况,更要命的是可读性差。你把它放到业务代码里,后面接手的人大概率要停下来想几秒。

代码让人停下来,不一定是高级,有时只是添堵。

Python 里更要注意一点:左边变量数量和右边值数量要对上。

a, b = 1020a, b = b, a      # 正常x, y = 123# 直接 ValueError

报错会很直接:

ValueError: too many values to unpack

还有一种写法在列表里也常用,比如交换两个位置的数据:

orders = ["paid""packed""checked"]orders[1], orders[2] = orders[2], orders[1]print(orders)# ['paid', 'checked', 'packed']

这个比先 pop 再 insert 干净多了。尤其是做排序、修正顺序、调整字段位置时,一行交换就够。

我自己判断要不要这么写,一般就看两点。

第一,交换是不是纯交换。如果交换中间还夹着校验、转换、日志,那就拆开写,别硬挤一行。

第二,变量名是不是清楚。像 a, b = b, a 在小例子里没问题,业务代码里最好别全是 ab。你写成 min_price, max_price = max_price, min_price,别人一眼知道你在修价格边界。

所以这不是语法炫技。

在 Python 里,不使用中间变量交换两个变量,就写:

x, y = y, x

该用就用,别再手写 tmp。除非你真想让后面的人多看三行。

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  1. CONNECT:[ UseTime:0.000337s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000611s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000280s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000246s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000475s ]
  6. SELECT * FROM `set` [ RunTime:0.003955s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000635s ]
  8. SELECT * FROM `article` WHERE `id` = 498132 LIMIT 1 [ RunTime:0.010444s ]
  9. UPDATE `article` SET `lasttime` = 1783042669 WHERE `id` = 498132 [ RunTime:0.003610s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000265s ]
  11. SELECT * FROM `article` WHERE `id` < 498132 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001564s ]
  12. SELECT * FROM `article` WHERE `id` > 498132 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008592s ]
  13. SELECT * FROM `article` WHERE `id` < 498132 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.026460s ]
  14. SELECT * FROM `article` WHERE `id` < 498132 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015761s ]
  15. SELECT * FROM `article` WHERE `id` < 498132 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.045246s ]
0.190042s