mirror of https://github.com/python/cpython
46 lines
2.1 KiB
ReStructuredText
46 lines
2.1 KiB
ReStructuredText
:mod:`pickletools` --- Tools for pickle developers
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==================================================
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.. module:: pickletools
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:synopsis: Contains extensive comments about the pickle protocols and
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pickle-machine opcodes, as well as some useful functions.
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This module contains various constants relating to the intimate details of the
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:mod:`pickle` module, some lengthy comments about the implementation, and a
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few useful functions for analyzing pickled data. The contents of this module
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are useful for Python core developers who are working on the :mod:`pickle`;
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ordinary users of the :mod:`pickle` module probably won't find the
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:mod:`pickletools` module relevant.
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.. function:: dis(pickle, out=None, memo=None, indentlevel=4, annotate=0)
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Outputs a symbolic disassembly of the pickle to the file-like
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object *out*, defaulting to ``sys.stdout``. *pickle* can be a
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string or a file-like object. *memo* can be a Python dictionary
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that will be used as the pickle's memo; it can be used to perform
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disassemblies across multiple pickles created by the same
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pickler. Successive levels, indicated by ``MARK`` opcodes in the
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stream, are indented by *indentlevel* spaces. If a nonzero value
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is given to *annotate*, each opcode in the output is annotated with
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a short description. The value of *annotate* is used as a hint for
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the column where annotation should start.
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.. versionadded:: 3.2
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The *annotate* argument.
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.. function:: genops(pickle)
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Provides an :term:`iterator` over all of the opcodes in a pickle, returning a
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sequence of ``(opcode, arg, pos)`` triples. *opcode* is an instance of an
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:class:`OpcodeInfo` class; *arg* is the decoded value, as a Python object, of
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the opcode's argument; *pos* is the position at which this opcode is located.
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*pickle* can be a string or a file-like object.
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.. function:: optimize(picklestring)
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Returns a new equivalent pickle string after eliminating unused ``PUT``
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opcodes. The optimized pickle is shorter, takes less transmission time,
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requires less storage space, and unpickles more efficiently.
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