0-3  0˾$la eJvţ e^̿?import os import sys import time import pty import tty import errno import signal from contextlib import contextmanager import ptyprocess from ptyprocess.ptyprocess import use_native_pty_fork from .exceptions import ExceptionPexpect, EOF, TIMEOUT from .spawnbase import SpawnBase from .utils import ( which, split_command_line, select_ignore_interrupts, poll_ignore_interrupts ) @contextmanager def _wrap_ptyprocess_err(): """Turn ptyprocess errors into our own ExceptionPexpect errors""" try: yield except ptyprocess.PtyProcessError as e: raise ExceptionPexpect(*e.args) PY3 = (sys.version_info[0] >= 3) class spawn(SpawnBase): '''This is the main class interface for Pexpect. Use this class to start and control child applications. ''' # This is purely informational now - changing it has no effect use_native_pty_fork = use_native_pty_fork def __init__(self, command, args=[], timeout=30, maxread=2000, searchwindowsize=None, logfile=None, cwd=None, env=None, ignore_sighup=False, echo=True, preexec_fn=None, encoding=None, codec_errors='strict', dimensions=None, use_poll=False): '''This is the constructor. The command parameter may be a string that includes a command and any arguments to the command. For example:: child = pexpect.spawn('/usr/bin/ftp') child = pexpect.spawn('/usr/bin/ssh user@example.com') child = pexpect.spawn('ls -latr /tmp') You may also construct it with a list of arguments like so:: child = pexpect.spawn('/usr/bin/ftp', []) child = pexpect.spawn('/usr/bin/ssh', ['user@example.com']) child = pexpect.spawn('ls', ['-latr', '/tmp']) After this the child application will be created and will be ready to talk to. For normal use, see expect() and send() and sendline(). Remember that Pexpect does NOT interpret shell meta characters such as redirect, pipe, or wild cards (``>``, ``|``, or ``*``). This is a common mistake. If you want to run a command and pipe it through another command then you must also start a shell. For example:: child = pexpect.spawn('/bin/bash -c "ls -l | grep LOG > logs.txt"') child.expect(pexpect.EOF) The second form of spawn (where you pass a list of arguments) is useful in situations where you wish to spawn a command and pass it its own argument list. This can make syntax more clear. For example, the following is equivalent to the previous example:: shell_cmd = 'ls -l | grep LOG > logs.txt' child = pexpect.spawn('/bin/bash', ['-c', shell_cmd]) child.expect(pexpect.EOF) The maxread attribute sets the read buffer size. This is maximum number of bytes that Pexpect will try to read from a TTY at one time. Setting the maxread size to 1 will turn off buffering. Setting the maxread value higher may help performance in cases where large amounts of output are read back from the child. This feature is useful in conjunction with searchwindowsize. When the keyword argument *searchwindowsize* is None (default), the full buffer is searched at each iteration of receiving incoming data. The default number of bytes scanned at each iteration is very large and may be reduced to collaterally reduce search cost. After :meth:`~.expect` returns, the full buffer attribute remains up to size *maxread* irrespective of *searchwindowsize* value. When the keyword argument ``timeout`` is specified as a number, (default: *30*), then :class:`TIMEOUT` will be raised after the value specified has elapsed, in seconds, for any of the :meth:`~.expect` family of method calls. When None, TIMEOUT will not be raised, and :meth:`~.expect` may block indefinitel