code: def collect_single_s3(self, path):
          
  
          # The S3 folder contains the tokens needed to perform
          # matching of project, gitref, etc.
          folder = os.path.dirname(path)
  
          rinfo = re.findall(r'(?P<tag>[^-]+)-(?P<val>.*?)__', folder)
          if rinfo is None or len(rinfo) == 0:
              # print('Incorrect folder/file name format for %s' % folder)
              return None
  
          info = dict(rinfo)
  
          # Ignore AppVeyor Debug builds
          if info.get('bldtype', '').lower() == 'debug':
              print('Ignoring debug artifact %s' % folder)
              return None
  
          tag = info.get('tag', None)
          if tag is not None and (len(tag) == 0 or tag.startswith('$(')):
              # AppVeyor doesn't substite $(APPVEYOR_REPO_TAG_NAME)
              # with an empty value when not set, it leaves that token
              # in the string - so translate that to no tag.
              tag = None
  
          sha = info.get('sha', None)
  
          # Match tag or sha to gitref
          if (tag is not None and tag == self.gitref) or (sha is not None and sha.startswith(self.gitref)):
              return Artifact(self, path, info)
  
          return None
docs: Collect single S3 artifact
           :param: path string: S3 path