1 from email.message import Message
2 from email.mime.base import MIMEBase
3 from email.policy import Policy
4 from typing import Optional, Sequence, Tuple, Union
6 _ParamsType = Union[str, None, Tuple[str, Optional[str], str]]
8 class MIMEMultipart(MIMEBase):
12 boundary: str | None = ...,
13 _subparts: Sequence[Message] | None = ...,
15 policy: Policy | None = ...,
16 **_params: _ParamsType,