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Simple e-mail composition

Project description

Project Status: Active — The project has reached a stable, usable state and is being actively developed. CI Status https://codecov.io/gh/jwodder/eletter/branch/master/graph/badge.svg https://img.shields.io/pypi/pyversions/eletter.svg MIT License

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eletter provides a basic function for constructing an email.message.EmailMessage instance without having to touch the needlessly complicated EmailMessage class itself. E-mails with text bodies and/or HTML bodies plus attachments are supported. Support for more complex e-mails is planned for later.

Installation

eletter requires Python 3.6 or higher. Just use pip for Python 3 (You have pip, right?) to install eletter and its dependencies:

python3 -m pip install eletter

Example

import eletter

TEXT = (
    "Oh my beloved!\n"
    "\n"
    "Wilt thou dine with me on the morrow?\n"
    "\n"
    "We're having hot pockets.\n"
    "\n"
    "Love, Me\n"
)

HTML = (
    "<p>Oh my beloved!</p>\n"
    "<p>Wilt thou dine with me on the morrow?</p>\n"
    "<p>We're having <strong>hot pockets</strong>.<p>\n"
    "<p><em>Love</em>, Me</p>\n"
)

with open("hot-pocket.png", "rb") as fp:
    picture = eletter.BytesAttachment(
        content=fp.read(),
        filename="enticement.png",
        content_type="image/png",
    )

msg = eletter.compose(
    subject="Meet Me",
    from_="me@here.qq",
    to=[eletter.Address("My Dear", "my.beloved@love.love")],
    text=TEXT,
    html=HTML,
    attachments=[picture],
)

# Now you can send `msg` like any other EmailMessage, say, by using
# outgoing <https://github/jwodder/outgoing>.

API

eletter.compose(
    subject: str,
    from_: Union[AnyAddress, Iterable[AnyAddress]],
    to: Iterable[AnyAddress],
    text: Optional[str] = None,
    html: Optional[str] = None,
    cc: Optional[Iterable[AnyAddress]] = None,
    bcc: Optional[Iterable[AnyAddress]] = None,
    reply_to: Optional[Union[AnyAddress, Iterable[AnyAddress]]] = None,
    sender: Optional[AnyAddress] = None,
    date: Optional[datetime.datetime] = None,
    attachments: Optional[Iterable[Attachment]] = None,
    headers: Optional[Mapping[str, Union[str, Iterable[str]]]] = None,
) -> email.message.EmailMessage

Construct an EmailMessage instance from a subject, “From:” address, “To:” value, and a plain text and/or HTML body, optionally accompanied by attachments and other headers.

Arguments:

subjectstring (required)

The e-mail’s “Subject:” line

from_address or iterable of addresses (required)

The e-mail’s “From:” line. Note that this argument is spelled with an underscore, as “from” is a keyword in Python.

toiterable of addresses (required)

The e-mail’s “To:” line

textstring

The contents of a text/plain body for the e-mail. At least one of text and html must be specified.

htmlstring

The contents of a text/html body for the e-mail. At least one of text and html must be specified.

cciterable of addresses (optional)

The e-mail’s “CC:” line

bcciterable of addresses (optional)

The e-mail’s “BCC:” line

reply_toaddress or iterable of addresses (optional)

The e-mail’s “Reply-To:” line

senderaddress (optional)

The e-mail’s “Sender:” line. The address must be a string or Address, not a Group.

datedatetime (optional)

The e-mail’s “Date:” line

attachmentsiterable of attachments (optional)

A collection of attachments (see “Attachments”) to append to the e-mail

headersmapping from header names to strings or iterables of strings (optional)

A collection of additional headers to add to the e-mail. A header value may be either a single string or an iterable of strings to add multiple headers with the same name. If you wish to set an otherwise-unsupported address header like Resent-From to a list of addresses, use the format_addresses() function to first convert the addresses to a string.

Addresses

Addresses in eletter can be specified in three ways:

  • As an "address@domain.com" string giving just a bare e-mail address

  • As an eletter.Address("Display Name", "address@domain.com") instance pairing a person’s name with an e-mail address

  • As an eletter.Group("Group Name", iterable_of_addresses) instance specifying a group of addresses (strings or Address instances)

Note: eletter.Address and eletter.Group are actually just subclasses of Address and Group from email.headerregistry with slightly more convenient constructors. You can also use the standard library types directly, if you want to.

Attachments

eletter has three concrete attachment classes: BytesAttachment, TextAttachment, and EmailAttachment.

BytesAttachment

eletter.BytesAttachment(
    content: bytes,
    filename: str,
    *,
    content_type: str = "application/octet-stream",
    inline: bool = False,
)

Representation of a binary attachment. Besides using the constructor, instances can also be constructed via the from_file() classmethod:

@classmethod
eletter.BytesAttachment.from_file(
    cls,
    path: Union[bytes, str, os.PathLike],
    content_type: Optional[str] = None,
) -> BytesAttachment

Construct a BytesAttachment from the contents of the file at path. The filename of the attachment will be set to the basename of path. If content_type is None, the Content-Type is guessed based on path’s file extension.

TextAttachment

eletter.TextAttachment(
    content: str,
    filename: str,
    *,
    content_type: str = "text/plain",
    inline: bool = False,
)

Representation of a text attachment. The content type must have a maintype of “text”. Besides using the constructor, instances can also be constructed via the from_file() classmethod:

@classmethod
eletter.TextAttachment.from_file(
    cls,
    path: Union[bytes, str, os.PathLike],
    content_type: Optional[str] = None,
    encoding: Optional[str] = None,
    errors: Optional[str] = None,
) -> TextAttachment

Construct a TextAttachment from the contents of the file at path. The filename of the attachment will be set to the basename of path. If content_type is None, the Content-Type is guessed based on path’s file extension. encoding and errors are used when opening the file and have no relation to the Content-Type.

EmailAttachment

eletter.EmailAttachment(
    content: email.message.EmailMessage,
    filename: str,
    *,
    inline: bool = False,
)

Representation of a message/rfc822 attachment. Besides using the constructor, instances can also be constructed via the from_file() classmethod:

@classmethod
eletter.EmailAttachment.from_file(
    cls,
    path: Union[bytes, str, os.PathLike],
) -> EmailAttachment

Construct an EmailAttachment from the contents of the file at path. The filename of the attachment will be set to the basename of path.

Utility Functions

eletter.assemble_content_type(maintype: str, subtype: str, **params: str) -> str

Construct a Content-Type string from a maintype, subtype, and some number of parameters

eletter.format_addresses(addresses: Iterable[AnyAddress]) -> str

Format a sequence of addresses for use in a custom address header field.

eletter.reply_quote(s: str, prefix: str = "> ") -> str

Quote a text following the de facto standard for replying to an e-mail; that is, prefix each line of the text with "> " (or a custom prefix), and if a line already starts with the prefix, omit any trailing whitespace from the newly-added prefix (so "> already quoted" becomes ">> already quoted").

If the resulting string does not end with a newline, one is added. The empty string is treated as a single line.

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