code: def dumps(self):
          
  
          _s = super().dumps()
  
          # Tabu tables support a unusual syntax:
          # \begin{tabu} spread 0pt {<col format...>}
          #
          # Since this syntax isn't common, it doesn't make
          # sense to support it in the baseclass (e.g., Environment)
          # rather, here we fix the LaTeX string post-hoc
          if self._preamble:
              if _s.startswith(r"\begin{longtabu}"):
                  _s = _s[:16] + self._preamble + _s[16:]
              elif _s.startswith(r"\begin{tabu}"):
                  _s = _s[:12] + self._preamble + _s[12:]
              else:
                  raise TableError("Can't apply preamble to Tabu table "
                                   "(unexpected initial command sequence)")
  
          return _s
docs: Turn the tabu object into a string in Latex format.