Python ?? ???? readlines()? ?????

??:

subprocess.Popen? ???? Ruby ????? ??? ?? ? ???? ??? readline()? readline()? ????? ???? ?? ???? ????.

??:

Ruby ??? ??? ? ?? ?????? ?? ??? ????? ?? ???? ?? ?????.

from subprocess import Popen, PIPE, STDOUT
import pty
import os

file_path = '/Users/luciano/Desktop/ruby_sleep.rb'

command = ' '.join(["ruby", file_path])

master, slave = pty.openpty()
proc = Popen(command, bufsize=0, shell=True, stdout=slave, stderr=slave, close_fds=True)     
stdout = os.fdopen(master, 'r', 0)

while proc.poll() is None:
    data = stdout.readline()
    if data != "":
        print(data)
    else:
        break

print("This is never reached!")

ruby_sleep.rb ????? 2? ??? ??? ???? ?????. ??:

puts "hello"

sleep 2

puts "goodbye!"

?? ??:

ruby ????? ?? ???? ??(?, ?? ??) ???? ???? ??? readline()? ?? ??? ??? ?????. ?? ?? readline()? ?? ??? ?? ??? ??? ??? ???? ???.

???:

??? ???? ?? ?? ?? ?? ??? ????.

• Linux:

  ?? ?????? pty? ???? ?? ???(tty)? ?? Ruby ??? ? ???? ????? ? ?? ????? ???? ???.

  import os
  import pty
  from subprocess import Popen, STDOUT
  
  master_fd, slave_fd = pty.openpty()  # provide tty to enable
                                       # line-buffering on ruby's side
  proc = Popen(['ruby', 'ruby_sleep.rb'],
               stdin=slave_fd, stdout=slave_fd, stderr=STDOUT, close_fds=True)
  os.close(slave_fd)
  try:
      while 1:
          try:
              data = os.read(master_fd, 512)
          except OSError as e:
              if e.errno != errno.EIO:
                  raise
              break # EIO means EOF on some systems
          else:
              if not data: # EOF
                  break
              print('got ' + repr(data))
  finally:
      os.close(master_fd)
      if proc.poll() is None:
          proc.kill()
      proc.wait()
  print("This is reached!")

• Linux ??? ?? ???:

  ?? ??????? pty? ???? ??? ?? ???? ??? ??????? ???? ???? ???? ?? ???? ????? ???.

  import os
  import pty
  import select
  from subprocess import Popen, STDOUT
  
  master_fd, slave_fd = pty.openpty()  # provide tty to enable
                                       # line-buffering on ruby's side
  proc = Popen(['ruby', 'ruby_sleep.rb'],
               stdout=slave_fd, stderr=STDOUT, close_fds=True)
  
  timeout = .04 # seconds
  while 1:
      ready, _, _ = select.select([master_fd], [], [], timeout)
      if ready:
          data = os.read(master_fd, 512)
          if not data:
              break
          print("got " + repr(data))
      elif proc.poll() is not None: # select timeout
          assert not select.select([master_fd], [], [], 0)[0] # detect race condition
          break # proc exited
  os.close(slave_fd) # can't do it sooner: it leads to errno.EIO error
  os.close(master_fd)
  proc.wait()
  
  print("This is reached!")

• ??? ??? ??:

  ?? stdbuf? ???? ???? ???? ?? ???? ???? ? ????.

  from subprocess import Popen, PIPE, STDOUT
  
  proc = Popen(['stdbuf', '-oL', 'ruby', 'ruby_sleep.rb'],
               bufsize=1, stdout=PIPE, stderr=STDOUT, close_fds=True)
  for line in iter(proc.stdout.readline, b''):
      print line,
  proc.stdout.close()
  proc.wait()

??? ???? ?? Ruby ??? ?? ???? ????? ? ?? ????? ???? ?? readline( ) ???? ?????

? ??? Ruby ?????? ?? ? `readline()`? ?? `subprocess.Popen`? ???? ??? ???? ? ??? ??? ??? ? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!