将数据传递给全局变量FLASK并使用它

from flask import Flask

app = Flask(__name__)
FLASK = None

@app.route('/')
def index():
    global FLASK
    FLASK = "Hello, Flask!"
    return "Data has been assigned to FLASK global variable."

@app.route('/use_flask')
def use_flask():
    global FLASK
    if FLASK is not None:
        return FLASK
    else:
        return "FLASK global variable is empty."

if __name__ == '__main__':
    app.run()