Benchmark: timing 1000 iterations of build_print, list_print...
build_print: 120 wallclock secs (119.84 usr +  0.04 sys = 119.88 CPU) @  8.34/s (n=1000)
list_print: 92 wallclock secs (91.23 usr +  0.11 sys = 91.34 CPU) @ 10.95/s (n=1000)
              Rate build_print  list_print
build_print 8.34/s          --        -24%
list_print  10.9/s         31%          --