code: def convert2pstats(stats):
      
      if not isinstance(stats, YFuncStats):
          raise YappiError("Source stats must be derived from YFuncStats.")
      
      import pstats
      class _PStatHolder:
          def __init__(self, d):
              self.stats = d
          def create_stats(self):
              pass                
      def pstat_id(fs):
          return (fs.module, fs.lineno, fs.name)
      
      _pdict = {}
      
      # convert callees to callers
      _callers = {}
      for fs in stats:
          if not fs in _callers:
              _callers[fs] = {}
              
          for ct in fs.children:
              if not ct in _callers:
                  _callers[ct] = {}
              _callers[ct][pstat_id(fs)] = (ct.ncall, ct.nactualcall, ct.tsub ,ct.ttot)
      
      # populate the pstat dict.
      for fs in stats:
          _pdict[pstat_id(fs)] = (fs.ncall, fs.nactualcall, fs.tsub, fs.ttot, _callers[fs], )        
       
      return pstats.Stats(_PStatHolder(_pdict))
docs: Converts the internal stat type of yappi(which is returned by a call to YFuncStats.get())
      as pstats object.