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:mod:`quopri` --- Encode and decode MIME quoted-printable data
==============================================================

.. module:: quopri
   :synopsis: Encode and decode files using the MIME quoted-printable encoding.

**Source code:** :source:`Lib/quopri.py`

.. index::
   pair: quoted-printable; encoding
   single: MIME; quoted-printable encoding

--------------

This module performs quoted-printable transport encoding and decoding, as
defined in :rfc:`1521`: "MIME (Multipurpose Internet Mail Extensions) Part One:
Mechanisms for Specifying and Describing the Format of Internet Message Bodies".
The quoted-printable encoding is designed for data where there are relatively
few nonprintable characters; the base64 encoding scheme available via the
:mod:`base64` module is more compact if there are many such characters, as when
sending a graphics file.

.. function:: decode(input, output, header=False)

   Decode the contents of the *input* file and write the resulting decoded binary
   data to the *output* file. *input* and *output* must be :term:`binary file objects
   <file object>`.  If the optional argument *header* is present and true, underscore
   will be decoded as space. This is used to decode "Q"-encoded headers as
   described in :rfc:`1522`: "MIME (Multipurpose Internet Mail Extensions)
   Part Two: Message Header Extensions for Non-ASCII Text".


.. function:: encode(input, output, quotetabs, header=False)

   Encode the contents of the *input* file and write the resulting quoted-printable
   data to the *output* file. *input* and *output* must be
   :term:`binary file objects <file object>`. *quotetabs*, a
   non-optional flag which controls whether to encode embedded spaces
   and tabs; when true it encodes such embedded whitespace, and when
   false it leaves them unencoded.
   Note that spaces and tabs appearing at the end of lines are always encoded,
   as per :rfc:`1521`.  *header* is a flag which controls if spaces are encoded
   as underscores as per :rfc:`1522`.


.. function:: decodestring(s, header=False)

   Like :func:`decode`, except that it accepts a source :class:`bytes` and
   returns the corresponding decoded :class:`bytes`.


.. function:: encodestring(s, quotetabs=False, header=False)

   Like :func:`encode`, except that it accepts a source :class:`bytes` and
   returns the corresponding encoded :class:`bytes`. By default, it sends a
   ``False`` value to *quotetabs* parameter of the :func:`encode` function.



.. seealso::

   Module :mod:`base64`
      Encode and decode MIME base64 data