ok then, how about this (last sentence of middle paragraph slightly modified):

"""There are two interfaces provided by this module. The modern interface
supports encoding and decoding string objects using all three alphabets.
The modern interface, per RFC 3548, does NOT break the output into multiple
lines.

The legacy interface provides for encoding and decoding to and from
file-like objects as well as strings, but only using the Base64 standard
alphabet, and adds newlines every 76 characters as per RFC 2045 (MIME).
Thus, the legacy interface does not implement the newer RFC 3548.

If you are encoding data for email attachments and wondering which to use,
you can use the legacy functions but you should probably be using the email
package instead.
"""