我尝试在 AWS lambda 中使用 pexpect 库，但收到以下错误：
[ERROR] OSError: out of pty devices
事实证明，任何包含 pty.spawn() 的代码都会在 lambda 中失败。下面是失败的 lambda 的最短代码：
import json
import pty
def lambda_handler(event, context):
pty.spawn('ls')
return {
'statusCode': 200,
'body': json.dumps('Hello from Lambda!')
}
等效的期望代码也非常基本：
cmd = f'sftp -i my_key_file -q username@server'
child = pexpect.spawn(cmd, encoding='utf-8')
产生的异常是：
[ERROR] OSError: out of pty devices
Traceback (most recent call last):
...
child = pexpect.spawn(...)
File "/var/lang/lib/python3.7/site-packages/pexpect/pty_spawn.py", line 205, in __init__
self._spawn(command, args, preexec_fn, dimensions)
File "/var/lang/lib/python3.7/site-packages/pexpect/pty_spawn.py", line 304, in _spawn
cwd=self.cwd, **kwargs)
File "/var/lang/lib/python3.7/site-packages/pexpect/pty_spawn.py", line 315, in _spawnpty
return ptyprocess.PtyProcess.spawn(args, **kwargs)
File "/var/lang/lib/python3.7/site-packages/ptyprocess/ptyprocess.py", line 230, in spawn
pid, fd = pty.fork()
File "/var/lang/lib/python3.7/pty.py", line 96, in fork
master_fd, slave_fd = openpty()
File "/var/lang/lib/python3.7/pty.py", line 29, in openpty
master_fd, slave_name = _open_terminal()
File "/var/lang/lib/python3.7/pty.py", line 59, in _open_terminal
raise OSError('out of pty devices')
[ERROR] OSError: out of pty devices Traceback (most recent call last):
