few months ago i had to optimize some old python code, .. and found that my longtime assumptions from py 1,2 and early 3.x are not anymore true. So put up some

few months ago i had to optimize some old python code, .. and found that my longtime assumptions from py 1,2 and early 3.x are not anymore true. So put up some comparisons.. Check them here: https://github.com/svilendobrev/transit-python3/blob/master/benchmark/timing-probi.py https://github.com/svilendobrev/transit-python3/blob/master/... (comment out the import transit.* and the two checks after it as they are specific. Takes ~25 seconds to finish) Results like below. Most make sense, after thinking deeper about it, but some are weird. One thing stays axiomatic though: no way of doing something is faster than not doing it at all. Lesson: measure before assuming anything "from-not-so-fresh-experience". btw, unrelated, probably will be looking for work next month. Have fun. $ python timing-probi.py ... :::: c_pfx_check :::: f_tuple 0.10805996900126047 f_list 0.10568888399939169 f_tuple_global 0.10741564899944933 f_list_global 0.10980218799886643 f_dict_global 0.09630626599937386 f_tuple_global20 0.6103107449998788 f_list_global20 0.6878404369999771 f_one_by_one 0.05088467200039304 :::: c_func_glob_vs_staticmethod :::: f_glob_func 0.08005491699987033 f_staticmethd 0.10022392999962904 :::: c_for_loop_vs_gen_for :::: for_loop 0.2255296620005538 gen_loop 0.29973782500019297 :::: c_dictget_vs_dict_subscr :::: dictgetattr_get 0.05093873599980725 dictfuncget 0.048424991000501905 dictin_dictsubscr 0.04722780499832879 dictsubscr 0.04069488099958107 :::: c_listget_vs_list_subscr :::: listgetattr_get 0.0779018819994235 listfuncget 0.07271830799982126 listsubscr 0.057812218999970355 :::: c_property_vs_funccall :::: property 0.08194994600125938 funccall 0.08422214100028214 :::: c_a_in_abc_vs_a_eq_b_or :::: x_in_str 0.04265176899934886 x_in_tuple 0.0530087259994616 x_in_tuple_global 0.05479079300130252 x_eq_a_or 0.049807468998551485 :::: c_tuple_vs_slots :::: slots 0.17708088200015482 plain 0.18551878399921407 tuple 0.07675717399979476 dict 0.14878148099887767 namedtuple 0.2637523979992693 dataclass 0.18731526199917425 dataclassfrozen 0.38634534500124573 :::: c_dictcomp_vs_dict_gen_tuples_vs_loop :::: dictcomp 4.476536423999278 dict_gen_tuples 7.045798945999195 dict_listcomp 6.461099333000675 dictloop 4.889642943000581 :::: c_listcomp_vs_list_gen_vs_loop :::: listcomp 1.4269603859993367 list_gen 2.6340354429994477 listloop1 1.856299590001072 listloop2 2.1041324060006446 :::: c_funccall_args_vs_kargs :::: args 0.14374798999961058 kargs 0.1689707850000559 kargs_ignored 0.2658924890001799 kargs_default 0.26562809300048684