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问线程类- 'int‘不可迭代| Flask
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Stack Overflow用户

提问于 2020-10-23 06:34:37

回答 1查看 42关注 0票数 0

我目前遇到了一个问题，我在POST请求时使用线程在后台执行任务，但我在使用整数作为参数或任何数据类型作为参数时遇到了问题。

应该发生的是，它应该执行POST请求检查中的所有内容，然后在完成检查后执行其他操作。

导入：

from flask import Flask, url_for, render_template, redirect, request
from flask.cli import with_appcontext, click
import sqlalchemy
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager, login_required, current_user

线程类：

@click.command(name='run')
@click.pass_context
class Compute(Thread):
    def __init__(self, secs):
        Thread.__init__(self)
        self.secs = secs

    def run(self):
        print('Thread Opened')
        sleep(self.secs)
        db.session.query(Users).filter(Users.username == current_user.username).first().requests += 1
        db.session.commit()
        print('Thread Closed')

烧瓶路由：

@app.route('/index', methods=['GET', 'POST'])
@login_required
def index():
    if request.method == 'POST':
        time = '5'

        thread = Compute(int(time))
        thread.start()
        return redirect(url_for('index'))
    else:   
        return render_template('index.html')

当线程尝试启动时，我收到的错误是：

Traceback (most recent call last):
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\flask\app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\flask\app.py", line 1952, in full_dispatch_request    rv = self.handle_user_exception(e)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\flask\app.py", line 1821, in handle_user_exception    reraise(exc_type, exc_value, tb)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\flask\_compat.py", line 39, in reraise
    raise value
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\flask\app.py", line 1950, in full_dispatch_request    rv = self.dispatch_request()
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\flask\app.py", line 1936, in dispatch_request     
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\flask_login\utils.py", line 272, in decorated_view    return func(*args, **kwargs)
  File "c:/Users/myuser/Desktop/Projects/Python/app.py", line 104, in layer4
    thread = Compute(int(time))
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\click\core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\click\core.py", line 767, in main
    args = list(args)
TypeError: 'int' object is not iterable

我对线程不是很有经验，我只在其他项目中涉足过，所以我不确定为什么我会遇到这个错误；任何帮助我都非常感激。

python-3.x

flask

回答 1

Stack Overflow用户

发布于 2020-10-23 10:56:44

您需要删除@click.command和@click.pass_context装饰器。

@click.command(name='run')
@click.pass_context
class Compute(Thread):

这些装饰器将类包装在一个函数中，该函数接受自己的参数。它用于从命令行运行函数和解析参数。这就是为什么回溯将args = list(args)显示为导致错误的行的原因。

https://github.com/pallets/click/blob/master/src/click/core.py#L916-L917

        :param args: the arguments that should be used for parsing.  If not
                     provided, ``sys.argv[1:]`` is used.

票数 0

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/64491447

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