Is it possible to run Web Server using Flask microframework simultaneously with a loop? [duplicate]

Question

I try to create a Web Server using Flask and I want to add an infinite loop just like this:

from flask import Flask
app = Flask(__name__)

@app.route("/")
def main():
   return "This is my website". 

if __name__ == "__main__":
   app.run()
   while True:
       print("Hello World")

but when I run the program, string "Hello World" is never printed, is there a solution for this ? Thanks

Can you try putting app = Flask(__name__) and @app.route("/") inside the def main():? — Sheldore
– Sheldore, Commented Oct 2, 2018 at 14:09

Alexander Ejbekov · Accepted Answer · 2018-10-02 14:15:56Z

1

That is to be expected, since app.run() is an infinite loop via werkzeug(which is a WSGI utility library that is used by flask). So the simple answer is no, it is not possible under those circumstances. What you'll need to do is use something like multiprocessing or threading

answered Oct 2, 2018 at 14:15

Alexander Ejbekov

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2 Comments

Quoc-Hung Hoang Over a year ago

what is the main difference between multiprocessing and threading ?

Alexander Ejbekov Over a year ago

This should answer that one.

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