Python; jump to a concrete line

[Horacius ReX]

Hi, sorry but after looking for information, I still did not get how,
when reading a text file in python, can one jump to a concrete line
and then read the different data (separated by spaces). In each line
there is different number of columns so sometimes i get kind of "index
out" error. Is there a better way to read the different data on each
row and avoiding to know the exact number of columns ?

Thanks