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  1. ls = [1, 2, 3, 4, 5, 6, 7, 8, 9]
  2.    
  3. ls = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
  4.    
  5. >>> nls=[]
  6. >>> for i in range(0,3):nls.append(ls[3*i:3*i+3])
  7. >>> nls
  8. [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
  9.    
  10. In [132]: ls = [1, 2, 3, 4, 5, 6, 7, 8, 9]
  11.  
  12. In [133]: [ls[i*3:i*3+3] for i in range((len(ls)//3 + (len(ls)%3>0)*1))]
  13. Out[133]: [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
  14.  
  15. In [134]: ls = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
  16.  
  17. In [135]: [ls[i*3:i*3+3] for i in range((len(ls)//3 + (len(ls)%3>0)*1))]
  18. Out[135]: [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10]]
  19.  
  20. In [136]: ls = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
  21.  
  22. In [137]: [ls[i*3:i*3+3] for i in range((len(ls)//3 + (len(ls)%3>0)*1))]
  23. Out[137]: [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11]]
  24.  
  25. In [138]: ls = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
  26.  
  27. In [139]: [ls[i*3:i*3+3] for i in range((len(ls)//3 + (len(ls)%3>0)*1))]
  28. Out[139]: [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]
  29.    
  30. result = [ls[i:i+3] for i in range(0, len(ls), 3)]
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