L=[[1,2,3],
[4,2,1],
[9,8,7]]
def recorrerColN(L, F):
L2 = []
for i in range(len(L)):
L2.append(L[i][F-1])
return L2
print(recorrerColN(L, 2)) # Pasando la lista L y el número de columna 2 (tercera columna)
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