code: def browse(request, classifiers):
      
      session = DBSession()
      release = Release.by_classifiers(session, classifiers)
      rv = [(r.package.name, r.version) for r in release]
      return rv
docs: Retrieve a list of (name, version) pairs of all releases classified
      with all of the given classifiers. 'classifiers' must be a list of
      Trove classifier strings.
  
      changelog(since)
      Retrieve a list of four-tuples (name, version, timestamp, action)
      since the given timestamp. All timestamps are UTC values.
      The argument is a UTC integer seconds since the epoch.