【每日一坑 2】 去除重复

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1. 
   
2. list_num = [4, 7, 3, 4, 1, 9, 8, 3, 7]
   
3. list_copy=list_num
   
4. print list_num
   
5. 
   
6. for x in list_copy:
   
7.       num_count=list_copy.count(x)  
   
8.       if num_count>1:
   
9.          list_copy.remove(x)
   
10. 
    
11. list_copy.sort()   
    
12. print list_copy
    

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