[在Python中使用Flask时线程运行两次？

Question

我的代码如下：

app = Flask(__name__)

def target():
    while True:
        time.sleep(10)
        print('ok')

if __name__ == '__main__':
    thread(target = target, args = ()).start()
    app.run()

为什么目标函数运行两次？ （我的意思是，每10秒输出为2 'ok'）

Answer 1

我试图在@Gabip上发表评论，但似乎标记的评论确实受到限制。

这是一个完整的示例，即使我的计算机上没有线程，它也会打印两次。

from flask import Flask
app = Flask(__name__)

@app.route('/', methods=['GET'])
def index():
   return 'Hello World'

if __name__ == '__main__':
    print('This gets printd twice')
    app.run(host='127.0.0.1', port=8080, debug=True)

输出：

$ python test.py 
This gets printd twice
 * Serving Flask app "test" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Running on http://127.0.0.1:8080/ (Press CTRL+C to quit)
 * Restarting with stat
This gets printd twice
 * Debugger is active!
 * Dbugger PIN: 977-268-905