@classmethod
def _get_raw_from_config(cls) -> str:
    '\n        Read the value from environment variable.\n\n        Returns\n        -------\n        str\n            Config raw value.\n\n        Raises\n        ------\n        KeyError\n            If value is absent.\n        '
    return os.environ[cls.varname]
Read the value from environment variable.

Returns
-------
str
    Config raw value.

Raises
------
KeyError
    If value is absent.
@classmethod
def _get_raw_from_config(cls) -> str:
    '\n        Read the value from environment variable.\n\n        Returns\n        -------\n        str\n            Config raw value.\n\n        Raises\n        ------\n        KeyError\n            If value is absent.\n        '
    return os.environ[cls.varname]