Definitely agree the API can be tightened up, but just for fun and perspective take a look at pre pandas data wrangling tools like sas. Like Example x3 vs x5 i

Definitely agree the API can be tightened up, but just for fun and perspective take a look at pre pandas data wrangling tools like sas. Like Example x3 vs x5 in their docs on the sum function: http://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a000245953.htm http://support.sas.com/documentation/cdl/en/lrdict/64316/HTM...