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  1. lista = [['DE','DO','OU'],['AE','YHH','OO'],['OW','LA','FOR']]
  2.  
  3. lista_lower = [[w.lower() for w in line] for line in lista]
  4. print(lista_lower)
Success #stdin #stdout 0.03s 27704KB
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Standard input is empty
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[['de', 'do', 'ou'], ['ae', 'yhh', 'oo'], ['ow', 'la', 'for']]
https://ideone.com/2Nzf0Q
language:
Python 3 (python  3.9.5)
created:
7 years ago
visibility:
public

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