Here we try to imitate Flask global objects magic in which `from flask import request` magically finds the current request. We use contextvars to make it more understandable, as a con it requires calling `.get()` instead of just using the imported module attribute. I like this since it doesn't hide the fact that the object is lazily evaluated

contextvars_config.py

"""
Here we try to imitate Flask global objects magic in which `from flask import request` 
magically finds the current request. 
We use contextvars to make it more understandable, as a con it requires calling `.get()` 
instead of just using the imported module attribute. 
I like this since it doesn't hide the fact that the object is lazily evaluated
"""

# This single file represents three modules. app.py, bootstrap.py and settings.py
# Each file's content is preceded by the file name.

# app.py
# Try reading config, fail. Import setup code, then retry and succed
from settings import config

print(config)
try:
    config.get()
except LookupError:
    print('i failed')

# Now importing the code that sets it up
from bootstrap import *

print(config.get())


# bootstrap.py
# Set the configuration to something
from settings import config

def set_config(value):
    config.set(value)

set_config('x')


# settings.py
from contextvars import ContextVar, Token

config: ContextVar = ContextVar('config')