email.generator.BytesGenerator.flatten()

flatten(msg, unixfrom=False, linesep=None)

Print the textual representation of the message object structure rooted at msg to the output file specified when the BytesGenerator instance was created. Subparts are visited depth-first and the resulting text will be properly MIME encoded. If the policy option cte_type is 8bit (the default), then any bytes with the high bit set in the original parsed message that have not been modified will be copied faithfully to the output. If cte_type is 7bit, the bytes will be converted as needed using an ASCII-compatible Content-Transfer-Encoding. In particular, RFC-invalid non-ASCII bytes in headers will be encoded using the MIME unknown-8bit character set, thus rendering them RFC-compliant.

Messages parsed with a Bytes parser that have a Content-Transfer-Encoding of 8bit will be reconstructed as 8bit if they have not been modified.

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.

Optional linesep specifies the line separator character used to terminate lines in the output. If specified it overrides the value specified by the Generatoror msg‘s policy.