# -*- coding: utf-8 -*-

from environs import Env

env = Env()

# read .env file, if it exists
env.read_env()

env.str('FLASK_APP')     # app.py
env.bool('FLASK_DEBUG')  # True

# .env

FLASK_APP = app.py
FLASK_ENV = development
FLASK_DEBUG = 1

env.str
env.bool
env.int
env.float
env.decimal
env.list (accepts optional subcast keyword argument)
env.dict (accepts optional subcast keyword argument)
env.json
env.datetime
env.date
env.timedelta (assumes value is an integer in seconds)
env.url
env.uuid
env.log_level
env.path (casts to a pathlib.Path)