code: def check_candidate_exists(self, basepath, candidates):
          
          checked = []
          for item in candidates:
              abspath = os.path.join(basepath, item)
              if os.path.exists(abspath):
                  checked.append(abspath)
  
          return checked
docs: Check that at least one candidate exist into a directory.
  
          Args:
              basepath (str): Directory path where to search for candidate.
              candidates (list): List of candidate file paths.
  
          Returns:
              list: List of existing candidates.