CODEWITHSUNDEEP
loggingflask
fuzes
fuzes

Reputation: 2067

How to use app logging in flask views, it returns cannot import name logger

I want to make flask project to large project structure so I found sample project like following

 ~/LargeApp
|-- run.py
|-- config.py
|__ /env             # Virtual Environment
|__ /app             # Our Application Module
     |-- __init__.py
     |-- /module_one
         |-- __init__.py
         |-- views.py
         |-- models.py                
     |__ /templates
         |__ /module_one
             |-- hello.html
     |__ /static
     |__ ..
     |__ .
|__ ..
|__ .

I write create_app function in /app/init.py

def create_app():
    app = Flask(__name__)
    app.config.from_object(os.environ['APP_SETTINGS'])

    app.logger = my_get_logger_function() # this function set log level, and add handler to logger and return logger
    db.init_app(app)

    from .module_one.views import mod as module_one_blueprint
    app.register_blueprint(module_one_blueprint)

    return app

and I want to use logger in my /app/module_one/views.py, following is my views.py file

from app import logger
...
@mod.route('/test/', methods=['GET'])
def test():
    logger.info('test')

but when i run, i got message "ImportError: cannot import name 'logger"

I know it's because I call logger in views.py before app was created

but i really don't know how i fix it and how do i design a my project

Upvotes: 3

Views: 516

Answers (2)

NsdHSO
NsdHSO

Reputation: 153

Try this : from flask.logging import logging I also had this problem, I don't know why, but I tried it and it worked well.

Upvotes: 0

j2logo
j2logo

Reputation: 669

Really the error is due to you have not defined the name logger in your module app. If you want to use the app logger, you should import the current_app from flask which is the instance of your app as follows:

from flask import current_app

Then, in your view, you can use the logger:

current_app.logger.info('Your message')

Upvotes: 3

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