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Python Library Reference |
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Python Library Reference |
One of the most common tasks is to generate the flat text of the email message represented by a message object structure. You will need to do this if you want to send your message via the smtplib module or the nntplib module, or print the message on the console. Taking a message object structure and producing a flat text document is the job of the Generator class.
Again, as with the email.Parser module, you aren't limited to the functionality of the bundled generator; you could write one from scratch yourself. However the bundled generator knows how to generate most email in a standards-compliant way, should handle MIME and non-MIME email messages just fine, and is designed so that the transformation from flat text, to a message structure via the Parser class, and back to flat text, is idempotent (the input is identical to the output).
Here are the public methods of the Generator class:
| outfp[, mangle_from_[, maxheaderlen]]) |
Optional mangle_from_ is a flag that, when True, puts a
">" character in front of any line in the body that starts exactly as
"From ", i.e. From followed by a space at the beginning of the
line. This is the only guaranteed portable way to avoid having such
lines be mistaken for a Unix mailbox format envelope header separator (see
WHY THE CONTENT-LENGTH FORMAT IS BAD
for details). mangle_from_ defaults to True, but you
might want to set this to False if you are not writing Unix
mailbox format files.
Optional maxheaderlen specifies the longest length for a non-continued header. When a header line is longer than maxheaderlen (in characters, with tabs expanded to 8 spaces), the header will be split as defined in the email.Header class. Set to zero to disable header wrapping. The default is 78, as recommended (but not required) by RFC 2822.
The other public Generator methods are:
| msg[, unixfrom]) |
Optional unixfrom is a flag that forces the printing of the
envelope header delimiter before the first RFC 2822 header of the
root message object. If the root object has no envelope header, a
standard one is crafted. By default, this is set to False to
inhibit the printing of the envelope delimiter.
Note that for subparts, no envelope header is ever printed.
New in version 2.2.2.
| fp) |
New in version 2.2.2.
| s) |
As a convenience, see the methods Message.as_string() and
str(aMessage), a.k.a. Message.__str__(), which
simplify the generation of a formatted string representation of a
message object. For more detail, see email.Message.
The email.Generator module also provides a derived class, called DecodedGenerator which is like the Generator base class, except that non-text parts are substituted with a format string representing the part.
| outfp[, mangle_from_[, maxheaderlen[, fmt]]]) |
This class, derived from Generator walks through all the subparts of a message. If the subpart is of main type text, then it prints the decoded payload of the subpart. Optional _mangle_from_ and maxheaderlen are as with the Generator base class.
If the subpart is not of main type text, optional fmt is a format string that is used instead of the message payload. fmt is expanded with the following keywords, "%(keyword)s"format:
type - Full MIME type of the non-text part
maintype - Main MIME type of the non-text part
subtype - Sub-MIME type of the non-text part
filename - Filename of the non-text part
description - Description associated with the
non-text part
encoding - Content transfer encoding of the
non-text part
The default value for fmt is None, meaning
[Non-text (%(type)s) part of message omitted, filename %(filename)s]
New in version 2.2.2.
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Python Library Reference |