code: def guess_stream_needs_encoding(fileobj, default=True):
      
      # XXX: Unicode
      # On Python 2, stdout is bytes. However, we can't wrap it in a
      # TextIOWrapper, as it's not from IOBase, so it doesn't have .seekable.
      # It does, however, have a mode, and we can cheese it base on that.
      # On Python 3, stdout is a TextIOWrapper, and so we can safely write
      # str to it, and it will encode it correctly for the target terminal or
      # whatever.
      # If it's a io.BytesIO or StringIO, then it won't have a mode, but it
      # is a read/write stream, so we can get its type by reading 0 bytes and
      # checking the type.
      try:
          # If it's a r/w stream, this will give us the type of it
          t = type(fileobj.read(0))
  
          if t is bytes:
              return True
          elif t is unicode:
              return False
  
      except Exception:
          pass
  
      try:
          mode = fileobj.mode
  
          if PY2 and mode == "w":
              mode = "wb"
  
          if "b" in mode:
              return True
          else:
              return False
      except Exception:
          pass
  
      return default
docs: Guess the type (bytes/unicode) of this stream, and return whether or not it
      requires text to be encoded before written into it.