L = [ ['Apple','Google','Microsoft'], ['Java','Python','Ruby','PHP'], ['Adam','Bart','Lisa'] ] print(len(L)) print(L[0][0]) print(L[1][1]) print(L[2][-1])
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承德沈楠
L = [ ['Apple','Google','Microsoft'], ['Java','Python','Ruby','PHP'], ['Adam','Bart','Lisa'] ] print(len(L)) print(L[0][0]) print(L[1][1]) print(L[2][-1])