code: def getFileKeys(self):
          
          files = self.getFileObjects()
  
          files_list = []
  
          for key, value in files.iteritems():
              if value:
                  files_list.append(key)
  
          return files_list
docs: Retrieve a list of file keys that have been read into the database.
  
          This is a utility method that can be used to programmatically access the GsshaPy file objects. Use these keys
          in conjunction with the dictionary returned by the getFileObjects method.
  
          Returns:
              list: List of keys representing file objects that have been read into the database.