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Replace `pexpect` with `subprocess`

my platform: macOS (Intel)

When I was running zamm and approving a terminal process, it stuck for several seconds then raised

│ /Users/markyfsun/.conda/envs/auto_weekly/lib/python3.10/site-packages/langchain_contrib/tools/te │
│ rminal/terminal.py:84 in _get_raw_shell_update_uncached                                          │
│                                                                                                  │
│    81 │   │   │   │   results += latest_output                                                   │
│    82 │   │   │   │   time.sleep(0.1)                                                            │
│    83 │   │   except pexpect.TIMEOUT as e:                                                       │
│ ❱  84 │   │   │   raise UnknownResult(                                                           │
│    85 │   │   │   │   "Terminal output does not have initial prompt of: "                        │
│    86 │   │   │   │   f"'{self.bash_prompt}':\n\n{results}"                                      │
│    87 │   │   │   ) from e                                                                       │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
UnknownResult: Terminal output does not have initial prompt of: '
The default interactive shell is now zsh.
To update your account to use zsh, please run `chsh -s /bin/zsh`.
For more details, please visit https://support.apple.com/kb/HT208050.
[1m[?1034hzamm$ ':

python3 hello.py
Hello world
Bye
zamm$

I assume that pexpect here expects $ as the start flag and the EOF flag, however my terminal wrote something else to the output, so the match could not be found.

I wonder if you can use subprocess.getoutput here to execute bash command, since you only need to get the output of the command?

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