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Encode the bytes-like object s, which can contain arbitrary binary data, and return bytes containing the base64-encoded data, with newlines (b'\n') inserted after every 76 bytes of output, and ensuring that there is a trailing newline, as per RFC 2045 (MIME).

Example:

>>> print(base64.encodebytes(b'a' * 100).decode())
YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFh
YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYQ==
  
Encode the string s, which can contain arbitrary binary data, and return a string containing one or more lines of base64-encoded data. encodestring() returns a string containing one or more lines of base64-encoded data always including an extra trailing newline ('\n').
The docs for version 2 could certainly be written more clearly, but it does what you want.
Example:
>>> print base64.encodestring('a'*100)
YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFh
YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYQ==
If you want line break, don't use the straight base64 package, use the one provided in email:
import email
print email.base64MIME.encode(your_string)
It do split the encoded string each 76 characters
                This adds a newline. Try a longer string & you'll see. Also, "...'strict', meaning that encoding errors raise a UnicodeError)" docs.python.org/2/library/…
– user_78361084
                Sep 3, 2014 at 22:54
        
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