mirror of
https://github.com/python/cpython.git
synced 2025-10-31 02:15:10 +00:00
41 lines
1.8 KiB
ReStructuredText
41 lines
1.8 KiB
ReStructuredText
|
|
: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.
|
|
|
|
|
|
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.
|
|
|