code: def DecompressionFile(src_fp, algorithm):
      
      if algorithm == "lzma":
          return lzma.open(src_fp, "r")
  
      if algorithm == "snappy":
          return SnappyFile(src_fp, "rb")
  
      if algorithm:
          raise InvalidConfigurationError("invalid compression algorithm: {!r}".format(algorithm))
  
      return src_fp
docs: This looks like a class to users, but is actually a function that instantiates a class based on algorithm.