> Complaints about this seem to come from the functional language circles, where chaining 10 .filter()'s, .map()'s, etc. together in a single line is considered

> Complaints about this seem to come from the functional language circles, where chaining 10 .filter()'s, .map()'s, etc. together in a single line is considered not only normal, but desirable and idiomatic. To go full circle, pandas, an extremely popular python library, forces you to do exactly that, because the straightforward imperative loop is slow as a glacier.