code: def tty():
      if os.isatty(1):
          return
  
      fd = os.open("/dev/tty", os.O_RDWR)
      os.dup2(fd, 0)
      os.dup2(fd, 1)
      os.dup2(fd, 2)
      os.close(fd)
  
      old_sys_path = sys.path
      sys.path = list(sys.path)
      try:
          import_readline()
      finally:
          sys.path = old_sys_path
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import argparse
  import pdb
  import sys
  from doctest import UnexpectedException
  from _pytest import outcomes
  from _pytest.config import hookimpl
  from _pytest.config.exceptions import UsageError
label_desc: Use image node_id 2 for calling a global function with example usage: tty() without return types