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这些Python库,简直是“偷懒”界的诺贝尔奖得主!

  • 2026-01-19 00:04:04
这些Python库,简直是“偷懒”界的诺贝尔奖得主!

这些Python库,简直是”偷懒”界的诺贝尔奖得主!

程序员有句老话:懒惰是第一生产力。这话听着像是在找借口,但你仔细琢磨,好像还真有那么点道理。那些让你少写代码、少加班的Python库,本质上就是把”偷懒”这件事做到了极致。今天聊几个我用了就回不去的库,它们能把原本要写几十行的活儿,压缩成一两行搞定。

Pandas:数据处理的瑞士军刀

处理表格数据这事儿,以前是真的头疼。读个CSV文件,要写循环;筛选数据,又要写循环;做个汇总统计,还是循环。代码写得人眼花,还容易出bug。


Pandas的出现直接把这些活儿都接管了。核心就两个东西:SeriesDataFrame。你可以把DataFrame理解成一张Excel表格,但它比Excel聪明多了。

importpandasaspd

# 一行代码读取文件
df = pd.read_csv('员工信息.csv')

# 筛选年龄大于30的员工
result = df[df['年龄'] > 30]

# 按部门统计平均工资
avg_salary = df.groupby('部门')['工资'].mean()

看到没?三行代码干了以前三十行的事情。那个groupby尤其好用,以前手写分组逻辑能把人写崩溃,现在一行搞定。


温馨提示:新手常犯一个错,就是用df['列名'] = 30想着筛选,结果把整列数据都改成30了。筛选要用双层中括号或者.loc,别搞混了。

Requests:发请求跟说话一样简单

Python标准库里那个urllib,用过的人都知道有多别扭。光是发个GET请求,就要写一堆让人看不懂的代码。


Requests库的口号是”HTTP for Humans”,翻译过来就是”给人用的HTTP库”。这名字起得相当自信,但人家确实有这个底气。

importrequests

# 发送GET请求
response = requests.get('https://api.example.com/users')

# 拿到JSON数据
data = response.json()

# 发送POST请求带参数
result = requests.post('https://api.example.com/login', 
                       data={'username': 'admin', 'password': '123456'})

就这么简单。想带Cookie?用Session对象自动管理。想设置超时?加个timeout参数。写爬虫、调接口,基本离不开这玩意儿。


我见过有人为了”学习底层原理”坚持用urllib写了个爬虫项目,写完之后他说再也不想碰urllib了。有些苦没必要吃。

FastAPI:自动挡的Web框架

写后端API有个烦人的事儿,就是要处理参数校验。用户传过来的数据五花八门,你得一个个检查:这个字段是不是必填的?那个字段类型对不对?检查完还得写文档告诉前端怎么调用……


FastAPI把这些破事儿都自动化了。你只要声明好参数类型,框架自己就会校验。

fromfastapiimport FastAPI
frompydanticimport BaseModel

app = FastAPI()

classUser(BaseModel):
    name: str
    age: int
    email: str

@app.post("/users/")
defcreate_user(user: User):
    return {"message": f"用户{user.name}创建成功"}

这段代码做了三件事:接收JSON数据、自动校验类型、返回结果。如果前端传的age是个字符串,FastAPI会自动返回错误信息,你连判断都不用写。


更绝的是,它还自动生成API文档。启动服务后访问/docs路径,一份可交互的Swagger文档就出来了,前端同事看了直呼内行。


温馨提示:FastAPI底层用的是Pydantic做数据校验,这两个库经常一起出现。面试时候问到FastAPI,八成会顺带问Pydantic,记得一块儿看看。

Typer:命令行工具的福音

写个Python脚本,想让它支持命令行参数,传统做法是用argparse。那个库功能是够用,但写起来真的啰嗦,定义一个参数要好几行。


Typer用了个讨巧的办法:直接利用Python的类型提示来生成命令行界面。

importtyper

![](https://imgs.cheemao.com/images/2026/01/07/8c6b121b6b32430e9148eb812be1b65c.jpg)

defmain(name: str, count: int = 1, uppercase: bool = False):
"""打招呼的小工具"""
    greeting = f"你好, {name}!" * count
    if uppercase:
        greeting = greeting.upper()
    print(greeting)

if __name__ == "__main__":
    typer.run(main)

就这么点代码,已经支持了--name--count--uppercase这些参数,还自动生成了帮助信息。你在终端敲python main.py --help,会看到一份漂亮的使用说明,连函数的docstring都给你用上了。


以前写个像样的CLI工具要折腾半天,现在十分钟能搞定,剩下的时间摸鱼不香吗?

一个容易踩的坑

这些库虽然好用,但有个问题要注意:版本兼容性


Pandas从1.x升级到2.x改了不少东西,老项目直接升级可能会炸。Requests倒是比较稳,但也遇到过SSL证书相关的坑。装库之前看一眼项目的Python版本要求和依赖关系,能省不少排错时间。


回过头看,这些库的共同点就是把重复劳动封装起来,让你只关心业务逻辑。有人说用库太多会变成”调包侠”,这话有一定道理,但也不能因噎废食。理解原理是一回事,干活效率是另一回事。会用Pandas不影响你理解数据结构,会用Requests也不妨碍你搞懂HTTP协议。


把节省下来的时间拿去学更深的东西,这才是真正的”偷懒”哲学。

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  1. CONNECT:[ UseTime:0.000385s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000521s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000252s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002158s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000582s ]
  6. SELECT * FROM `set` [ RunTime:0.005430s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000612s ]
  8. SELECT * FROM `article` WHERE `id` = 462111 LIMIT 1 [ RunTime:0.000683s ]
  9. UPDATE `article` SET `lasttime` = 1770623303 WHERE `id` = 462111 [ RunTime:0.012114s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000277s ]
  11. SELECT * FROM `article` WHERE `id` < 462111 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000347s ]
  12. SELECT * FROM `article` WHERE `id` > 462111 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001652s ]
  13. SELECT * FROM `article` WHERE `id` < 462111 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000798s ]
  14. SELECT * FROM `article` WHERE `id` < 462111 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001187s ]
  15. SELECT * FROM `article` WHERE `id` < 462111 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007575s ]
0.101395s