first commit

Author: anandtripathi5

.env

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+ANOTHER_SECRET_KEY=base
+PORT=5080
+USERNAME=base

config.py

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+import os
+from typing import Union
+
+from pydantic import BaseSettings, Field
+
+
+class Base(BaseSettings):
+    secret_key: str = Field('random_string', env='ANOTHER_SECRET_KEY')
+    port: int = 5050
+    username: str = "ANAND"
+
+    class Config:
+        case_sensitive = False
+        env_file = '.env'
+
+
+class Dev(Base):
+    username = "TRIPATHI"
+
+    class Config:
+        env_file = 'dev.env'
+
+
+class Prod(Base):
+    username = "Production"
+    port = 5051
+
+    class Config:
+        env_file = 'prod.env'
+
+
+config = dict(
+    dev=Dev,
+    prod=Prod
+)
+settings: Union[Dev, Prod] = config[os.environ.get('ENV', 'dev').lower()]()

dev.env

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+ANOTHER_SECRET_KEY=dev
+PORT=5080
+USERNAME=DevUsername

main.py

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+from flask import Flask
+
+from dotenv import load_dotenv
+
+from config import settings
+
+load_dotenv()  # take environment variables from .env.
+
+app = Flask(__name__)
+
+
+@app.get("/")
+async def hello_world():
+    template = f'''
+    <p>Hello, {vars(settings)}!</p>
+    '''
+    return template
+
+if __name__ == '__main__':
+    app.run(port=settings.port)

prod.env

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+ANOTHER_SECRET_KEY=prod
+PORT=5090
+USERNAME=ProdUsername

run_with_env.sh

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+ENV_FILE="$1"
+CMD=${@:2}
+
+set -o allexport
+source $ENV_FILE
+set +o allexport
+
+$CMD