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                            ```
ITEM_PIPELINES = {
    'scrapy_demo.pipelines.ScrapyDemoPipeline': 300,  pipeline的位置，權重
}
```
```
1.pipeline可以有多個
2.權重越小優先級越高
3.可能會有多個pipeline，因為可能會有多個spider，不同的pipeline處理不同的item
4.一個spider的內容可能要做不同的操作，比如存入不同的數據庫中
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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