remove duplication by converting list of formulas to set

Author: zmzhang

python/pubchem.py

@@ -71,5 +71,6 @@ def load_jsons(json_path):
 # pool = ProcessingPool(os.cpu_count())
 # pool.map(process_sdf, sdfs, range(len(sdfs)), [len(sdfs)]*len(sdfs)) 
  mols = load_jsons(sdf_path)
+ mols_rd = list(set(mols))