code: def init_db(self):
      '''init_db for the filesystem ensures that the base folder (named 
         according to the studyid) exists.
      '''
      self.session = None
  
      if not os.path.exists(self.data_base):
          mkdir_p(self.data_base)
  
      self.database = "%s/%s" %(self.data_base, self.study_id)
      if not os.path.exists(self.database):
          mkdir_p(self.databasef init_db(self):
      '''init_db for the filesystem ensures that the base folder (named 
         according to the studyid) exists.
      '''
      self.session = None
  
      if not os.path.exists(self.data_base):
          mkdir_p(self.data_base)
  
      self.database = "%s/%s" %(self.data_base, self.study_id)
      if not os.path.exists(self.database):
          mkdir_p(self.database)
docs: init_db for the filesystem ensures that the base folder (named 
         according to the studyid) exists.