How to get variable from threading process in flask request?

Question

Python

Basically a question!
If the global variable changes in a separate thread, how can I get it through flask?

from flask import Flask
from threading import Thread
import time
import random

a='test'

def name():
    while True:
        time.sleep(1)
        letters = 'test'
        a=''.join(random.choice(letters) for i in range(len(letters)))

th = Thread(target=name)
th.start()

app = Flask(__name__)
@app.route("/")
def hello():
    return a
if __name__ == "__main__":
    app.run()

Answer 1

Because during the assignment in name() you create a local variable a that overrides the global one.
There are two solutions:
1. Simple: insert the string global a at the beginning of name() to work with the global variable
2. Correct: wrap the stream in a class, and work with its instance variable instead of the global one.
By the way, when starting the thread, add daemon=True, otherwise your thread will not allow the server to shut down (aka while True).