What `**config` does with dot_env values

Question

i have .env file and I am importing it with:

from dotenv import dotenv_values

config = dotenv_values('{}/.env")

and using this config as **config

But i need to add my key, values in my .env but when I do this the code failt to run. I think this is happening because of the **config

Can someone telling me how can I add my key:value in my .env withou break the code?