from sandpaper import SandPaper

paper = SandPaper('my-sandpaper')\
   .strip(                                  # strip whitespace from column comment
      column_filter=r'comment'
   )\
   .translate_text({                        # get group id from column group
      r'^group_(\d+)$': '{0}'
   }, column_filter=r'group')\
   .translate_date({                        # normalize date from column date
      '%Y-%m-%d': '%c',
      '%m-%d': '%c'
   }, column_filter=r'date')

# apply sandpaper rules to a source file and write results to a target file
paper.apply('/home/you/source.csv', '/home/you/target.csv')