People overestimate the contribution of all the fancy data science libraries and schemes compared to the effort of getting clean data into place where it can be

People overestimate the contribution of all the fancy data science libraries and schemes compared to the effort of getting clean data into place where it can be picked apart. Whether it is worth learning both Perl and Python for the same project is questionable, but as for assembling and cleaning up data, I haven't come across anything as good.