PEP formatting. Some code cleanup. Add in method to find a datafile by name and datadir id.
PEP formatting. Some code cleanup. Add in method to find a datafile by name and datadir id.

materials-commons/materialscommons.org,materials-commons/materialscommons.org,materials-commons/materialscommons.org,materials-commons/materialscommons.org,materials-commons/materialscommons.org