1.current_app 的介绍

• current_app 等同于 Flask 所实例化出来的 app 对象

2.current_app 的使用

• current_app 一般用于在使用蓝图后导入配置文件时所使用

• 以前的写法

# app.py

from flask import Flask

from settings import Config

app = Flask(__name__)

app.config.from_object('settings.Config')

@app.route('/index')

def index():

secret_key = Config.SECRET_KEY

    print(secret_key)  # session_salt

    return 'index_html'

if __name__ == '__main__':

    app.run()

# settings.py

class Config(object):

    DEBUG = True

    SECRET_KEY = 'session_salt'

• 使用 current_app 的写法

# app.py

from flask import Flask, current_app

app = Flask(__name__)

app.config.from_object('settings.Config')

@app.route('/index')

def index():

 # 写法一

secret_key1 = current_app.config.get('SECRET_KEY')

    print(secret_key1)  # session_salt

# 写法二

secret_key2 = current_app.config['SECRET_KEY']

    print(secret_key2)  # session_salt

# 等同于

    secret_key3 = app.config['SECRET_KEY']

    print(secret_key3)  # session_salt

    return 'index_html'

if __name__ == '__main__':

    app.run()

# settings.py

class Config(object):

    DEBUG = True

    SECRET_KEY = 'session_salt'