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                # 97 線程隔離的g對象使用詳解 g對象是整個flask應用運行期間都是可以使用的,并且也是跟request一樣的,是線程隔離的,這個對象是專門用來存儲開發者自定定義的一些數據,方便在整個flask程序中都可以使用,一般使用就是,將一些經常會用到的數據綁定到上面,以后就直接從g上面去就可以了 ```text from flask import Flask,request,current_app,url_for,g from werkzeug.local import Local,LocalStack from utils import log_a,log_b,log_c from threading import local # 只要綁定在Local對象上的屬性,在每個線程中都是隔離的 # Thread Local # flask = werkzeug+sqlalchemy+jinja # global --> g app = Flask(__name__) @app.route('/') def index(): # 獲取當前app對象 # print(current_app.name) print(url_for('my_list')) username = request.args.get("username") # log_a(username) # log_b(username) # log_c(username) g.username = username log_a() log_b() log_c() return 'Hello World!' if __name__ == '__main__': app.run() ``` ```text utils.py from flask import g def log_a(): print("log a {}".format(g.username)) def log_b(): print("log b {}".format(g.username)) def log_c(): print("log c {}".format(g.username)) ```
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