for 循环出来的结果如何生成列表？

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1. In [1]: r = []
   
2. 
   
3. In [2]: for i in range(1, 4):
   
4.    ...:     r.append(str(i))
   
5.    ...:     
   
6. 
   
7. In [3]: r
   
8. Out[3]: ['1', '2', '3']
   
9. 
   
10. In [4]: [str(i) for i in range(1, 4)]
    
11. Out[4]: ['1', '2', '3']
    
12. 
    
13. In [5]: list(map(str, range(1, 4)))
    
14. Out[5]: ['1', '2', '3']

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