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from flask import Flask,session,flash,get_flashed_messages app = Flask(__name__) app.secret_key = 'asdfasdfasdf'   @app.route('/x1',methods=['GET','POST']) def login():     flash('我要上向龙1',category='x1')     flash('我要上向龙2',category='x2')     return "视图函数x1"   @app.route('/x2',methods=['GET','POST']) def index():     data = get_flashed_messages(category_filter=['x1'])     print(data)     return "视图函数x2"   if __name__ == '__main__':     app.run()