docstr: Call the ``prover9`` binary with the given input.
  
  :param input_str: A string whose contents are used as stdin.
  :param args: A list of command-line arguments.
  :return: A tuple (stdout, returncode)
  :see: ``config_prover9``
docstr_tok: ["Call","the","``","prover9","``","binary","with","the","given","input",".",":","param","input_str",":","A","string","whose","contents","are","used","as","stdin",".",":","param","args",":","A","list","of","command-line","arguments",".",":","return",":","A","tuple","(","stdout",",","returncode",")",":","see",":","``","config_prover9","``"]
code: def _call_prover9(self, input_str, args=[], verbose=False):
      """
      Call the ``prover9`` binary with the given input.
  
      :param input_str: A string whose contents are used as stdin.
      :param args: A list of command-line arguments.
      :return: A tuple (stdout, returncode)
      :see: ``config_prover9``
      """
      if self._prover9_bin is None:
          self._prover9_bin = self._find_binary("prover9", verbose)
  
      updated_input_str = ""
      if self._timeout > 0:
          updated_input_str += (
              "assign(max_seconds, %d).\n\n" % self._timeout
          )
      updated_input_str += input_str
  
      stdout, returncode = self._call(
          updated_input_str, self._prover9_bin, args, verbose
      )
  
      if returncode not in [0, 2]:
          errormsgprefix = "%%ERROR:"
          if errormsgprefix in stdout:
              msgstart = stdout.index(errormsgprefix)
              errormsg = stdout[msgstart:].strip()
          else:
              errormsg = None
          if returncode in [3, 4, 5, 6]:
              raise Prover9LimitExceededException(returncode, errormsg)
          else:
              raise Prover9FatalException(returncode, errormsg)
  
      return stdout, returncode
  
imports: import os
  import subprocess
  import nltk
  from nltk.inference.api import BaseProverCommand, Prover
  from nltk.sem.logic import AllExpression, AndExpression, EqualityExpression, ExistsExpression, Expression, IffExpression, ImpExpression, NegatedExpression, OrExpression
label_desc: Use image node_id 4 for calling the Prover9 obj's underlying member method code with example usage: obj._call_prover9(input_str, args, verbose) and returns: stdout,  returncode