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from導入的是指向,如果這個變量的指向用=號的話,那么指向就變了.
import就不會出現這個問題

![](https://box.kancloud.cn/3130d307090f39c90cd1876e680923f3_968x521.png)

如果from導入的這個變量用global
![](https://box.kancloud.cn/b2463d4598833a5c1b3a0fdbc67ae25b_627x576.png)

這能當前模塊改變,但是導入的那個模塊不會,所以不行



                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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