pydotenv.py 文件源码

def unset_key(dotenv_path, key_to_unset, quote_mode="always"):
    """
    Removes a given key from the given .env

    If the .env path given doesn't exist, fails
    If the given key doesn't exist in the .env, fails
    """
    key_to_unset = str(key_to_unset)
    if not os.path.exists(dotenv_path):
        warnings.warn("can't delete from %s - it doesn't exist." % dotenv_path)
        return None, key_to_unset
    dotenv_as_dict = dotenv_values(dotenv_path)
    if key_to_unset in dotenv_as_dict:
        dotenv_as_dict.pop(key_to_unset, None)
    else:
        warnings.warn("key %s not removed from %s - key doesn't exist." % (key_to_unset, dotenv_path))
        return None, key_to_unset
    success = flatten_and_write(dotenv_path, dotenv_as_dict, quote_mode)
    return success, key_to_unset