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Python新手必看:这6个“看似聪明”的写法,其实全是反模式!

  • 2026-02-25 02:14:45
Python新手必看:这6个“看似聪明”的写法,其实全是反模式!

你是不是也曾经为写出一行“超酷”的Python代码而沾沾自喜?
结果上线后被同事疯狂吐槽、性能炸裂、维护到凌晨三点?
别慌——你不是一个人

今天我就来扒一扒那些 “看起来很聪明”但实则坑爹的Python反模式
这些写法,新手爱用,老手看了直摇头 👀。


1. 用 list + list 拼接大列表?小心内存爆炸 💥

# ❌ 反模式
big_list = []
for item in range(100000):
    big_list = big_list + [item]  # 每次都新建一个列表!

你以为只是加了个元素?
实际上,Python每次都会创建一个全新列表,时间复杂度是 **O(n²)**。

正确姿势是用 append() 或 extend()

# ✅ 正确写法
big_list = []
for item in range(100000):
    big_list.append(item)
# 或者更 Pythonic:
big_list = list(range(100000))

实测:拼接10万项,反模式耗时 **8秒+**,append 只要 0.01秒。差距千倍!


2. 用 try...except: pass 吞掉所有异常?你在埋雷 🧨

# ❌ 危险操作
try:
    risky_function()
except:
pass# 啥也不干,假装没事发生

这等于给程序装了“静音炸弹”
出错了?不知道。数据丢了?不知道。用户骂你?还是不知道。

至少要记录日志:

# ✅ 起码这样
import logging
try:
    risky_function()
except Exception as e:
    logging.error("出错了:%s", e)

真实案例:某公司因吞异常,导致数据库连续3天写入空值,损失百万订单。


3. 过度使用 lambda 和一行式推导?可读性直接归零 📉

# ❌ 聪明过头
result = list(map(lambda x: (x**2if x % 2 == 0else x**3) + 10, filter(lambda y: y > 0, data)))

这行代码,连你自己三天后都看不懂
别为了“炫技”牺牲可维护性。

拆开写,清晰又安全:

# ✅ 人类友好版
deftransform(x):
if x % 2 == 0:
return x**2 + 10
return x**3 + 10

result = [transform(x) for x in data if x > 0]

记住:代码是写给人看的,机器只是顺便执行一下


4. 用 is 判断数字或字符串相等?小心踩进CPython的坑 🕳️

# ❌ 危险对比
if user_id is1000:
    grant_access()

is 比较的是对象身份,不是值!
CPython 对小整数(-5~256)做了缓存,所以 5 is 5 成立,但 1000 is 1000 可能失败!

永远用 == 做值比较:

# ✅ 正确做法
if user_id == 1000:
    grant_access()

我见过因为这个 bug,导致 VIP 用户权限被拒的事故。别笑,真事。


5. 在函数默认参数里写可变对象?你的bug正在排队 🐛

# ❌ 经典陷阱
defadd_item(item, target_list=[]):
    target_list.append(item)
return target_list

默认参数只在函数定义时创建一次!
多次调用会共享同一个列表:

print(add_item(1))  # [1]
print(add_item(2))  # [1, 2] ← 啊??

正确写法:

# ✅ 安全版本
defadd_item(item, target_list=None):
if target_list isNone:
        target_list = []
    target_list.append(item)
return target_list

这是 Python 面试高频题,也是新手最容易栽的坑之一。


6. 用 exec 或 eval 执行动态代码?等于给黑客开后门 🔓

# ❌ 千万别这么干
user_input = input("输入表达式:")
result = eval(user_input)  # 如果输入 __import__('os').system('rm -rf /')...

eval 是安全灾难
哪怕你加了“过滤”,高手也能绕过。

替代方案:用 ast.literal_eval(仅限安全字面量),或自己写解析器。

# ✅ 安全做法(仅支持数字、列表、字典等)
import ast
try:
    result = ast.literal_eval(user_input)
except (ValueError, SyntaxError):
    print("非法输入!")

某开源项目曾因 eval 被远程执行命令,GitHub 上被狂喷上千条 issue。


写在最后:聪明≠好代码 💡

编程不是比谁写的代码最短、最炫、最像黑客帝国。
真正的高手,写的是清晰、安全、可维护的代码

这些反模式,我当年也全踩过 😅。
现在分享出来,就是希望你少走弯路。

记住:代码跑通只是开始,跑得稳、改得动、看得懂,才是本事。

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  1. CONNECT:[ UseTime:0.000340s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000543s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000507s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003988s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000481s ]
  6. SELECT * FROM `set` [ RunTime:0.003133s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000591s ]
  8. SELECT * FROM `article` WHERE `id` = 475824 LIMIT 1 [ RunTime:0.003900s ]
  9. UPDATE `article` SET `lasttime` = 1772260577 WHERE `id` = 475824 [ RunTime:0.001370s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000351s ]
  11. SELECT * FROM `article` WHERE `id` < 475824 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007562s ]
  12. SELECT * FROM `article` WHERE `id` > 475824 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003568s ]
  13. SELECT * FROM `article` WHERE `id` < 475824 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.022255s ]
  14. SELECT * FROM `article` WHERE `id` < 475824 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000909s ]
  15. SELECT * FROM `article` WHERE `id` < 475824 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005373s ]
0.145947s