scrapy啓動過程源碼分析

看了上一節分析的scrapy架構，咱們最想了解的，應該就是5大核心模塊是怎麼實現的吧。好，從github中找到各大核心模塊的源碼：html (1) Engine：scrapy/scrapy/core/engine.py (2) Scheduler：scrapy/scrapy/core/scheduler.py (3) Downloader：scrapy/scrapy/core/downloader

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