code: def _computeP(self):
          
          P = []
          for i in range(self.width):
              #print i,
              _p = {}
              for L in ACGT: _p[L] = math.pow(2.0,self.logP[i][L])
              P.append(_p)
          #print
          self.P = P
docs: m._computeP() -- [utility] Compute the probability matrix (from the internal log-probability matrix)