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I am using flask and trying to the following.
I have defined a main.py file through which I want to run my app ie python main.py -
from flask import Flask from view import tags app = Flask(__name__) @app.route('/') def hello_world(): return 'Hello World!' if __name__ == '__main__': app.run() I have defined a package named view in which I will be declaring my different view modules, each having its own routes. view.tags.py -
from flask import Flask app = Flask(__name__) @app.route('/e') def hello_world2(): return 'Hello World!' So I need to have the global app object in my main.py for running the server, as well as in the view classes of my package for registering the routes. So how do I create the global app object and share it between all classes ?
Thanks, Murtaza
681
You can activate your project by double-clicking the script file created with the name of your main flask file and can also share the build folder with anyone, without worrying that whether they have installed essential libraries on their system or not.
Today, there are two ways to expose your flask application to the internet. Deploy the web application in your office server which has a public IP address and domain name. Deploy the web application in the cloud such as AWS, MS Azure, GCP or web hosting companies like GoDaddy, SiteGround, A2Hosting etc.
Set an environment variable for FLASK_APP . On Linux and macOS, use export set FLASK_APP=webapp ; on Windows use set FLASK_APP=webapp . Navigate into the hello_app folder, then launch the program using python -m flask run .
You will often see current_app imported directly from flask instead of flask.globals. These imports are equivalent because flask is simply importing current_app from flask.globals. g , request , and session are several other callables with code examples from the same flask.globals package.
A corresponding application context is pushed when a request context is pushed. Purpose of the Context¶ The Flaskapplication object has attributes, such as config, that are useful to access within views and CLI commands. However, importing the appinstance within the modules in your project is prone to circular import issues.
g is an object for storing data during the application context of a running Flask web app. g can also be imported directly from the flask module instead of flask.globals, so you will often see that shortcut in example code. current_app , request , and session are several other callables with code examples from the same flask.globals package.
Flask provides the gobjectfor this purpose. It is a simple namespace object that has the same lifetime as an application context. Note The gname stands for “global”, but that is referring to the data being global within a context. The data on gis lost after the context ends, and it is not an appropriate place to store data between requests.
You can import current_app from flask. It stores a reference to the global application object.
from flask import current_app as app def home(): return render_template('base.html', name=app.name) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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