Index into matrix from function call

[atbug]

I (and probably most people) would prefer

eigvecs(
    a_matrix_with_a_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_long_name
)[:, 1:n]

over

eigvecs(
    a_matrix_with_a_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_long_name
)[
    :,
    1:n
]

Is there anyway to enforce the first formatting?