求助一个小代码问题，小白刚入门，求求了

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1. def not_bad(sentence):
   
2.     not_i = sentence.find('not')
   
3.     bad_i = sentence.find('bad')
   
4.     if not_i == -1 or bad_i == -1:
   
5.         return sentence
   
6.     elif bad_i > not_i:
   
7.         return sentence[:not_i] + 'good' + sentence[bad_i+3:]
   
8.     else:
   
9.         return sentence
   
10. 
    
11. string = 'not....bad'
    
12. result = not_bad(string)
    
13. print(result)

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