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Day3 | Python基础语法与数据类型(下)

  • 2026-08-18 23:11:57
Day3 | Python基础语法与数据类型(下)

Python 爬虫系列 · Day 3

Python 基础语法与数据类型(下)

文件读写避坑 · 异常处理三板斧 · 面向对象为 Scrapy 打地基

系列导航(20+ 天)

   ✅ Day1 | ✅ Day2(上) | ▶ Day3(下) | Day4 HTTP 协议 | Day5 TCP/IP | ...   

上篇回顾(Day 2):数据类型总览、字符串清洗、列表推导式、字典与集合的爬虫应用。本文接上篇,讲文件操作、异常处理、面向对象。

五、文件操作 — 数据持久化的第一步

爬虫拿到数据后,必须存下来。面试常考三个问题:with open 为什么比 open 好?CSV 写入有什么坑?JSON 怎么正确处理中文?

步骤知识点代码 / 坑点

with open 上下文管理器

自动关闭文件,不用手动 f.close()

     with open("data.txt","w") as f:    f.write(content)     

CSV 写入的编码坑

Windows 用 utf-8-sig,否则 Excel 乱码

     open("out.csv","w",  encoding="utf-8-sig",  newline="")     

JSON 中文不转义

ensure_ascii=False,否则中文变 \uXXXX

     json.dump(data,f,  ensure_ascii=False)     

面试常考:with open 底层调用了 __enter__ 和 __exit__ 魔术方法,即使代码抛异常也会自动关闭文件。这就是「上下文管理器」协议。

六、异常处理 — 爬虫不死的关键

爬虫在线上跑,网络超时、JSON 格式错误、Key 不存在——这些天天发生。没做好异常处理,爬虫跑 5 分钟就崩。

异常类型触发场景应对策略
requests.Timeout
目标服务器无响应
加 timeout 参数 + 重试
JSONDecodeError
返回的不是合法 JSON
先检查 Content-Type
KeyError
dict 中键不存在
用 .get() 代替 [] 取值
ConnectionError
DNS 失败 / 网络断开
加代理池 + 重试

千万别写裸 except:except: 会吃掉所有异常(包括 KeyboardInterrupt),爬虫卡死都不知道为什么。至少指定异常类型:except requests.Timeout:

最佳实践:try/except 只包裹可能出错的代码行,不要把整个爬虫塞进一个 try 里。每个独立操作(发请求、解析、写文件)各自 try/except + 各自日志。

七、面向对象 — 为 Scrapy 打地基

Scrapy 框架的核心就是面向对象:Spider 类继承、Item 数据模型、Pipeline 处理链。不懂类继承,Scrapy 就只会照抄模板。

概念一句话爬虫应用
类继承
子类复用父类的属性和方法
Scrapy 所有 Spider 继承 scrapy.Spider
@dataclass
自动生成 __init__,少写样板代码
定义 Item 数据模型
方法重写
子类覆盖父类方法
重写 parse()、start_requests()

面试能加分:能说出 super().__init__() 的作用(调用父类初始化),说明你理解继承链,不只是会用。Scrapy 源码里大量用到 super()。

提升问答:这段代码里用到了 set 去重、@dataclass 数据类、requests 发请求、try/except 精确捕获 Timeout、CSV/JSON 写入。你能逐行解释每个元素的类型和作用吗?

———— 基础语法篇完结 ————

自查提问(每题 30 秒,先自己想再看提示)

Q1  with open 比 open 好在哪里?底层协议叫什么?

💡 提示:自动关闭、__enter__/__exit__、上下文管理器

Q2  Windows 下写 CSV 为什么乱码?两个参数怎么设?

💡 提示:BOM、utf-8-sig、newline=""

Q3  为什么不能写裸 except?应该怎么做?

💡 提示:KeyboardInterrupt、精确捕获、每个操作单独 try

下篇预告(Day 4)— HTTP 协议全解析

   请求报文结构 · HTTP/1.0 → 2.0 演进 · GET vs POST 六大差异关键请求头(UA/Cookie/Referer)· 状态码应对策略 · HTTPS 为什么不能随便 verify=False

Python 爬虫系列 · 20+ 天 · 难度层层递进

下一篇:Day 4 — HTTP 协议全解析

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  1. 请求信息 : 2026-08-21 14:39:07 HTTP/2.0 GET : https://f.mffb.com.cn/a/509991.html
  2. 运行时间 : 0.214926s [ 吞吐率:4.65req/s ] 内存消耗:4,651.16kb 文件加载:140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=9fc7b12bb62aa5633b3480a9853c5b35
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  1. CONNECT:[ UseTime:0.000835s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000720s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001424s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000290s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.010375s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001151s ]
  8. SELECT * FROM `article` WHERE `id` = 509991 LIMIT 1 [ RunTime:0.022553s ]
  9. UPDATE `article` SET `lasttime` = 1787294348 WHERE `id` = 509991 [ RunTime:0.001323s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000372s ]
  11. SELECT * FROM `article` WHERE `id` < 509991 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001882s ]
  12. SELECT * FROM `article` WHERE `id` > 509991 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002120s ]
  13. SELECT * FROM `article` WHERE `id` < 509991 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001218s ]
  14. SELECT * FROM `article` WHERE `id` < 509991 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002342s ]
  15. SELECT * FROM `article` WHERE `id` < 509991 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001935s ]
0.217627s