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Python 的条件、循环和函数,别再拆开学了

  • 2026-08-18 23:11:34
Python 的条件、循环和函数,别再拆开学了
一批订单文件导进系统,跑到第 387 行突然停了。

日志里没什么高深异常,就一句:

ValueError: could not convert string to float: ''

金额字段是空字符串,float() 直接炸掉。更麻烦的是,脚本一停,前面处理了多少、后面还剩多少,全得重新查。

这种代码我一般不急着加 try...except。先看判断写在哪,循环有没有退出策略,函数是不是把脏数据带到了最深处。

原来的处理逻辑大概长这样:

for row in rows:
    amount = float(row["amount"])

if row["status"] == "paid":
        save_order(row["order_no"], amount)

代码不长,问题倒不少。

金额为空会中断;订单号缺失照样往下走;状态不是 paid 的记录虽然不会保存,但前面的转换已经执行了。判断顺序明显不对。

我会先把不能处理的数据挡在循环外层:

for row_no, row in enumerate(rows, start=2):
    order_no = row.get("order_no""").strip()
    amount_text = row.get("amount""").strip()
    status = row.get("status""").strip().lower()

ifnot order_no:
        print(f"第 {row_no} 行跳过:订单号为空")
continue

if status != "paid":
continue

ifnot amount_text:
        print(f"第 {row_no} 行跳过:金额为空,订单={order_no}")
continue

    amount = float(amount_text)
    save_order(order_no, amount)

这里的 continue 很实用。

碰到不符合条件的数据,直接结束本轮循环,不要把后续逻辑再套进三四层 if。代码一旦写成这样,基本就开始难看了:

if order_no:
if status == "paid":
if amount_text:
            ...

业务条件再多两个,右边能一路缩进到屏幕外面。Python 的缩进本来是帮你看结构的,不是拿来堆楼层的。

不过上面的代码还有个坑:金额只要出现 "12元""--" 这种内容,循环还是会中断。

这时候才该把转换单独收进函数。

defparse_amount(raw_value):
    text = str(raw_value or"").strip()

ifnot text:
returnNone

try:
        amount = float(text)
except ValueError:
returnNone

if amount <= 0:
returnNone

return round(amount, 2)

函数在这里不是为了展示“代码复用”,而是隔离不稳定输入。

调用方不需要知道金额怎么清洗,只需要判断结果能不能用:

failed_rows = []
saved_count = 0

for row_no, row in enumerate(rows, start=2):
    order_no = str(row.get("order_no"or"").strip()
    status = str(row.get("status"or"").strip().lower()

ifnot order_no or status != "paid":
continue

    amount = parse_amount(row.get("amount"))

if amount isNone:
        failed_rows.append({
"row_no": row_no,
"order_no": order_no,
"reason""金额格式错误",
        })
continue

    save_order(order_no, amount)
    saved_count += 1

print(f"导入完成:成功 {saved_count} 条,失败 {len(failed_rows)} 条")

条件判断负责决定“这条数据该不该继续”,循环负责控制“下一条什么时候开始”,函数负责把某一段容易出错的逻辑关起来。

这三个东西放到真实代码里,本来就是一起工作的。拆开背语法,写出来很容易变成一坨判断。

for 适合明确的数据集合,while 则更适合次数不固定的过程,比如接口重试。

defpush_order(order, sender, max_attempts=3):
    attempt = 1

while attempt <= max_attempts:
        result = sender(order)

if result.ok:
returnTrue

        print(
f"订单推送失败:order={order['order_no']} "
f"attempt={attempt} error={result.message}"
        )
        attempt += 1

returnFalse

这段代码里,while 不是用来从 1 数到 3,而是表达“只要还没超过重试次数,就继续尝试”。

成功后直接 return,不用再加一个变量记录状态,也不用等循环慢慢走完。超过次数仍然失败,函数自然返回 False

还有个细节我一直不太喜欢:函数里同时做校验、保存数据库、发送通知、打印统计。看着像一个入口解决全部问题,真出错时根本不知道该从哪一段查。

更稳一点的写法,是让每个函数只承担一个清楚的判断:

defshould_import(row):
return (
        bool(str(row.get("order_no"or"").strip())
and str(row.get("status"or"").lower() == "paid"
    )

主流程留下真正的处理顺序:

for row in rows:
ifnot should_import(row):
continue

    amount = parse_amount(row.get("amount"))
if amount isNone:
continue

    save_order(row["order_no"], amount)

代码不花哨,但出了问题很好查。

看到数据没保存,先查 should_import();进入了保存流程却报金额错误,就查 parse_amount();循环提前结束,再找有没有误用 break 或未处理异常。

条件、循环和函数真正有用的地方,不是能写出多少种语法,而是让程序在遇到脏数据、异常状态和重复任务时,仍然知道下一步该往哪走。

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  1. CONNECT:[ UseTime:0.001201s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002268s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007097s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005402s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001774s ]
  6. SELECT * FROM `set` [ RunTime:0.040975s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002119s ]
  8. SELECT * FROM `article` WHERE `id` = 508108 LIMIT 1 [ RunTime:0.004266s ]
  9. UPDATE `article` SET `lasttime` = 1787297979 WHERE `id` = 508108 [ RunTime:0.005310s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000924s ]
  11. SELECT * FROM `article` WHERE `id` < 508108 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000469s ]
  12. SELECT * FROM `article` WHERE `id` > 508108 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000533s ]
  13. SELECT * FROM `article` WHERE `id` < 508108 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001513s ]
  14. SELECT * FROM `article` WHERE `id` < 508108 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.030682s ]
  15. SELECT * FROM `article` WHERE `id` < 508108 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.034733s ]
0.314704s