:mod:`pickletools` --- Tools for pickle developers.

===================================================

.. module:: pickletools

   :synopsis: Contains extensive comments about the pickle protocols and pickle-machine

              opcodes, as well as some useful functions.

.. versionadded:: 2.3

This module contains various constants relating to the intimate details of the

:mod:`pickle` module, some lengthy comments about the implementation, and a few

useful functions for analyzing pickled data.  The contents of this module are

useful for Python core developers who are working on the :mod:`pickle` and

:mod:`cPickle` implementations; ordinary users of the :mod:`pickle` module

probably won't find the :mod:`pickletools` module relevant.

.. function:: dis(pickle[, out=None, memo=None, indentlevel=4])

   Outputs a symbolic disassembly of the pickle to the file-like object *out*,

   defaulting to ``sys.stdout``.  *pickle* can be a string or a file-like object.

   *memo* can be a Python dictionary that will be used as the pickle's memo; it can

   be used to perform disassemblies across multiple pickles created by the same

   pickler. Successive levels, indicated by ``MARK`` opcodes in the stream, are

   indented by *indentlevel* spaces.

.. function:: genops(pickle)

   Provides an :term:`iterator` over all of the opcodes in a pickle, returning a

   sequence of ``(opcode, arg, pos)`` triples.  *opcode* is an instance of an

   :class:`OpcodeInfo` class; *arg* is the decoded value, as a Python object, of

   the opcode's argument; *pos* is the position at which this opcode is located.

   *pickle* can be a string or a file-like object.

.. function:: optimize(picklestring)

   Returns a new equivalent pickle string after eliminating unused ``PUT``

   opcodes. The optimized pickle is shorter, takes less transmission time,

   requires less storage space, and unpickles more efficiently.

   .. versionadded:: 2.6