折腾：
【未解决】用蓝图和工厂模式去优化现有Flask项目代码结构
期间，Flask中改造为create_app的工厂模式后，结果遇到了循环导入的问题：
File "/Users/crifan/dev/dev_root/company/xxx/projects/robotDemo/server/xxxRobotDemoServer/app.py", line 4, in <module> from factory import create_app File "/Users/crifan/dev/dev_root/company/xxx/projects/robotDemo/server/xxxRobotDemoServer/factory.py", line 8, in <module> from resources.tts import testAudioSynthesis, initAudioService File "/Users/crifan/dev/dev_root/company/xxx/projects/robotDemo/server/xxxRobotDemoServer/resources/tts.py", line 5, in <module> from app import app, log File "/Users/crifan/dev/dev_root/company/xxx/projects/robotDemo/server/xxxRobotDemoServer/app.py", line 4, in <module> from factory import create_app ImportError: cannot import name 'create_app'
不用贴代码，就可以看出是循环导入的问题。
此处的需求是：
在别的resources中，也需要导入当前的app（其实主要只用到了app.confg）以及其他变量（比如celery）
但是会导致循环调用
flask circular import create_app
有问题：别处初始化别的extension时，需要app.config的配置啊
怎么传递过去？
算了，把import的函数，放到初始化里面，避免递归调用吧
factory.py
import os
from flask import Flask
from flask_restful import Api
import logging
from logging.handlers import RotatingFileHandler
# from flask_pymongo import PyMongo
from gridfs import GridFS
from pymongo import MongoClient
# from flask_restful import Api
from flask_cors import CORS
from celery import Celery
################################################################################
# Global Variables
################################################################################
log = logging.getLogger()
print("log=%" % log)
# api = Api(app)
api = Api()
print("api=%" % api)
...
################################################################################
# Global Function
################################################################################
def create_app(config_object):
app = Flask(__name__)
CORS(app)
# app.config.from_object('config.DevelopmentConfig')
# # app.config.from_object('config.ProductionConfig')
app.config.from_object(config_object)
register_extensions(app)
def register_extensions(app):
global log, mongo, fsCollection, api, celery
log = create_log(app)
...
from resources.tts import testAudioSynthesis, initAudioService
from resources.asr import initASR
# testAudioSynthesis()
initAudioService()
log.info("inited for tts")
initASR()
log.info("inited for asr")
api = create_rest_api(app)
log.info("api=%s", api)
...
return app
def create_rest_api(app):
from resources.qa import RobotQaAPI
from resources.asr import RobotAsrAPI
from resources.files import GridfsAPI, TmpAudioAPI
rest_api = Api()
rest_api.add_resource(RobotQaAPI, '/qa', endpoint='qa')
rest_api.add_resource(RobotAsrAPI, '/asr/language/<string:language>', endpoint='asr')
rest_api.add_resource(GridfsAPI, '/files/<fileId>', '/files/<fileId>/<fileName>', endpoint='gridfs')
rest_api.add_resource(TmpAudioAPI, '/tmp/audio/<filename>', endpoint='TmpAudio')
rest_api.init_app(app)
return rest_api
...不过，在factory.py中
create_app之后再去register_extensions中，
from resources.tts import testAudioSynthesis, initAudioService
from resources.asr import initASR
# testAudioSynthesis()
initAudioService()
log.info("inited for tts")
initASR()还是会去导入resources.tts
而tts.py中还是会：
from app import app, log
-》在app没有完全初始化之前，还是会调用到当前的app
-》还是无法避免循环导入的问题。
感觉是：
获取只要保证其他resources中能，在使用的时候，再去引用app，
以及确保使用current_app，或者全局的g中保存app或log或app.logger，或许就可以了？
【已解决】Flask中如何在其他模块中引入当前的app或者全局单一实例的app
转载请注明：在路上 » 【已解决】Flask中循环导入app和create_app的问题：ImportError: cannot import name ‘create_app’