code: def run(self, gin):
          
          with ScratchDir("."):
              p = subprocess.Popen(
                  self._gulp_cmd, stdout=subprocess.PIPE,
                  stdin=subprocess.PIPE, stderr=subprocess.PIPE
              )
  
              out, err = p.communicate(bytearray(gin, "utf-8"))
              out = out.decode("utf-8")
              err = err.decode("utf-8")
  
              if "Error" in err or "error" in err:
                  print(gin)
                  print("----output_0---------")
                  print(out)
                  print("----End of output_0------\n\n\n")
                  print("----output_1--------")
                  print(out)
                  print("----End of output_1------")
                  raise GulpError(err)
  
              # We may not need this
              if "ERROR" in out:
                  raise GulpError(out)
  
              # Sometimes optimisation may fail to reach convergence
              conv_err_string = "Conditions for a minimum have not been satisfied"
              if conv_err_string in out:
                  raise GulpConvergenceError()
  
              gout = ""
              for line in out.split("\n"):
                  gout = gout + line + "\n"
              return gout
docs: Run GULP using the gin as input
  
          Args:
              gin: GULP input string
  
          Returns:
              gout: GULP output string