Question

每次运行代码时，我都会看到Serving Flask-SocketIO app "app.py"

我的系统上甚至没有SpcketIO

import os, passlib ,requests ,time ,json
from flask import Flask, session , render_template , request,redirect,url_for ,jsonify 
from flask_session import Session
import pandas as pd
from flask_uploads import UploadSet, configure_uploads, IMAGES, patch_request_class
from werkzeug import secure_filename
from datetime import date , datetime
from flask_sqlalchemy import SQLAlchemy
from passlib.hash import sha256_crypt
from flask_login import LoginManager , UserMixin , current_user ,login_user ,login_required ,logout_user

app = Flask(__name__)

在我的代码末尾，我已经拥有

if __name__ == "__main__":
app.run(debug=True)

我通过cmd运行系统：flask run

过去我一直忽略此错误，因为其他所有内容都在起作用，但是当我尝试添加app.run(debug=True,host='0.0.0.0')

时

debug=True似乎也没有做任何事情，我不得不通过CMD set Flask_Debug=1

将其打开

我遇到一个错误，指出ValueError: signal only works in main thread

该应用程序根本没有运行

确切错误

 * Serving Flask-SocketIO app "app.py"
 * Forcing debug mode on
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 885-769-473
Exception in thread Thread-1:
Traceback (most recent call last):
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\threading.py
", line 917, in _bootstrap_inner
    self.run()
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\threading.py
", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\site-package
s\flask_socketio\cli.py", line 59, in run_server
    return run_command()
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\site-package
s\click\core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\site-package
s\click\core.py", line 717, in main
    rv = self.invoke(ctx)
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\site-package
s\click\core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\site-package
s\click\core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\site-package
s\click\decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\site-package
s\click\core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\site-package
s\flask\cli.py", line 771, in run_command
    threaded=with_threads, ssl_context=cert)
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\site-package
s\werkzeug\serving.py", line 812, in run_simple
    reloader_type)
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\site-package
s\werkzeug\_reloader.py", line 267, in run_with_reloader
    signal.signal(signal.SIGTERM, lambda *args: sys.exit(0))
  File "c:\users\mena\appdata\local\programs\python\python37-32\lib\signal.py",
line 47, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread

要恢复工作，我必须关闭cmd set Flask_Debug=0

中的调试

我的系统出了什么问题？

Answer 1

请检查是否有其他线程在运行。然后尝试从终端通过命令python app.py运行您的应用程序，而不是烧瓶运行。可能是flask run命令调用了应用程序不需要的其他服务。

我还假设您正在Linux系统上工作。在终端（Windows cmd）和app.py所在的项目目录中，只需输入python（使用的python / python3依赖于哪个版本）app.py并按Enter。

在命令行上尝试

python app.py
or
python3 app.py

Flask Socket-IO运行时未导入，并且导致许多问题，例如无法托管='0.0.0.0'

1 个答案: