Jupyter Notebook中使用inquirer库出现(25, 'Inappropriate ioctl for device')错误求助

问题描述 #

使用inquirer编写选择题交互功能，代码为示例代码理论无问题，但在Jupyter Notebook运行时先显示选择界面，随即抛出error: (25, 'Inappropriate ioctl for device')错误，完整报错栈见下文。

运行代码 #

name = input("What's your name ?  ")

options = ['Social media', 'Ads', 'TV', 'Other']

questions = [
    inquirer.List('options', 
                 message = 'Welcome,' + name + '. How did you find out about this app?',
                 choices = options,
                 ),
]
answers = inquirer.prompt(questions)
print(answers)
print(answers['options'])

运行时显示的选择界面 #

[?] Welcome,David. How did you find out about this app?: Social media

> Social media
   Ads
   TV
   Other

完整报错栈 #

error                                     Traceback (most recent call last)
Cell In[25], line 25
     17 options = ['Social media', 'Ads', 'TV', 'Other']
     19 questions = [
     20     inquirer.List('options', 
     21                  message = 'Welcome,' + name + '. How did you find out about this app?',
     22                  choices = options,
     23                  ),
     24 ]
---> 25 answers = inquirer.prompt(questions)
     26 print(answers)
     27 print(answers['options'])

File ~/anaconda3/lib/python3.10/site-packages/inquirer/prompt.py:11, in prompt(questions, render, answers, theme, raise_keyboard_interrupt)
      9 try:
     10     for question in questions:
---> 11         answers[question.name] = render.render(question, answers)
     12     return answers
     13 except KeyboardInterrupt:

File ~/anaconda3/lib/python3.10/site-packages/inquirer/render/console/__init__.py:38, in ConsoleRender.render(self, question, answers)
     35 self.clear_eos()
     37 try:
---> 38     return self._event_loop(render)
     39 finally:
     40     print("")

File ~/anaconda3/lib/python3.10/site-packages/inquirer/render/console/__init__.py:51, in ConsoleRender._event_loop(self, render)
     48         self._print_header(render)
     49         self._print_options(render)
---> 51         self._process_input(render)
     52         self._force_initial_column()
     53 except errors.EndOfInput as e:

File ~/anaconda3/lib/python3.10/site-packages/inquirer/render/console/__init__.py:95, in ConsoleRender._process_input(self, render)
     93 def _process_input(self, render):
     94     try:
---> 95         ev = self._event_gen.next()
     96         if isinstance(ev, events.KeyPressed):
     97             render.process_input(ev.value)

File ~/anaconda3/lib/python3.10/site-packages/inquirer/events.py:22, in KeyEventGenerator.next(self)
     21 def next(self):
---> 22     return KeyPressed(self._key_gen())

File ~/anaconda3/lib/python3.10/site-packages/readchar/_posix_read.py:34, in readkey()
     30 def readkey() -> str:
     31     """Get a keypress. If an escaped key is pressed, the full sequence is
     32     read and returned as noted in `_posix_key.py`."""
---> 34     c1 = readchar()
     36     if c1 in config.INTERRUPT_KEYS:
     37         raise KeyboardInterrupt

File ~/anaconda3/lib/python3.10/site-packages/readchar/_posix_read.py:18, in readchar()
     14 """Reads a single character from the input stream.
     15 Blocks until a character is available."""
     17 fd = sys.stdin.fileno()
---> 18 old_settings = termios.tcgetattr(fd)
     19 term = termios.tcgetattr(fd)
     20 try:

error: (25, 'Inappropriate ioctl for device')

问题原因 #

Jupyter Notebook的输入输出环境并非标准终端（pty），inquirer依赖termios模块修改终端设置以捕获键盘交互，但Notebook的标准输入(stdin)不支持这类终端控制操作，因此触发报错。

解决方案 #

方案1：改用Jupyter原生交互组件ipywidgets #

使用ipywidgets的下拉选择组件替代inquirer，完美适配Notebook环境：

1. 先安装ipywidgets（若未安装）：

pip install ipywidgets
jupyter nbextension enable --py widgetsnbextension

2. 替换后的代码：

from ipywidgets import widgets, interact_manual

name = input("What's your name ?  ")
options = ['Social media', 'Ads', 'TV', 'Other']

# 创建下拉选择框
dropdown = widgets.Dropdown(
    options=options,
    value=options[0],
    description=f'Welcome,{name}. How did you find out about this app?:',
    disabled=False,
)

# 处理选择结果
def on_submit(choice):
    print(f"选择结果: {choice}")

# 绑定交互
interact_manual(on_submit, choice=dropdown);

方案2：在标准终端中运行脚本 #

将代码保存为.py文件（比如survey.py），然后在本地终端（如Linux终端、Windows的Anaconda Prompt）中执行：

python survey.py

此方式下inquirer可正常使用终端交互功能，不会触发报错。

内容的提问来源于stack exchange，提问作者David