tblib 3.2.2
Traceback serialization library.
Requires Python: >=3.9
Keywords: traceback, debugging, exceptions

========
Overview
========



Serialization library for Exceptions and Tracebacks.

* Free software: BSD license

It allows you to:

* `Pickle <https://docs.python.org/3/library/pickle.html>`_ tracebacks and raise exceptions
  with pickled tracebacks in different processes. This allows better error handling when running
  code over multiple processes (imagine multiprocessing, billiard, futures, celery etc).
* Create traceback objects from strings (the ``from_string`` method). *No pickling is used*.
* Serialize tracebacks to/from plain dicts (the ``from_dict`` and ``to_dict`` methods). *No pickling is used*.
* Raise the tracebacks created from the aforementioned sources.
* Pickle an Exception together with its traceback and exception chain
  (``raise ... from ...``) *(Python 3 only)*

**Again, note that using the pickle support is completely optional. You are solely responsible for
security problems should you decide to use the pickle support.**

Installation
============

::

    pip install tblib

Documentation
=============

.. contents::
   :local:

Pickling tracebacks
~~~~~~~~~~~~~~~~~~~

**Note**: The traceback objects that come out are stripped of some attributes (like variables). But you'll be able to raise exceptions with
those tracebacks or print them - that should cover 99% of the usecases.

::

    >>> from tblib import pickling_support
    >>> pickling_support.install()
    >>> import pickle, sys
    >>> def inner_0():
    ...     raise Exception('fail')
    ...
    >>> def inner_1():
    ...     inner_0()
    ...
    >>> def inner_2():
    ...     inner_1()
    ...
    >>> try:
    ...     inner_2()
    ... except:
    ...     s1 = pickle.dumps(sys.exc_info())
    ...
    >>> len(s1) > 1
    True
    >>> try:
    ...     inner_2()
    ... except:
    ...     s2 = pickle.dumps(sys.exc_info(), protocol=pickle.HIGHEST_PROTOCOL)
    ...
    >>> len(s2) > 1
    True

    >>> try:
    ...     import cPickle
    ... except ImportError:
    ...     import pickle as cPickle
    >>> try:
    ...     inner_2()
    ... except:
    ...     s3 = cPickle.dumps(sys.exc_info(), protocol=pickle.HIGHEST_PROTOCOL)
    ...
    >>> len(s3) > 1
    True

Unpickling tracebacks
~~~~~~~~~~~~~~~~~~~~~

::

    >>> pickle.loads(s1)
    (<...Exception'>, Exception('fail'...), <traceback object at ...>)

    >>> pickle.loads(s2)
    (<...Exception'>, Exception('fail'...), <traceback object at ...>)

    >>> pickle.loads(s3)
    (<...Exception'>, Exception('fail'...), <traceback object at ...>)

Raising
~~~~~~~

::

    >>> from tblib.decorators import reraise
    >>> reraise(*pickle.loads(s1))
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[14]>", line 1, in <module>
        reraise(*pickle.loads(s2))
      File "<doctest README.rst[8]>", line 2, in <module>
        inner_2()
      File "<doctest README.rst[5]>", line 2, in inner_2
        inner_1()
      File "<doctest README.rst[4]>", line 2, in inner_1
        inner_0()
      File "<doctest README.rst[3]>", line 2, in inner_0
        raise Exception('fail')
    Exception: fail
    >>> reraise(*pickle.loads(s2))
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[14]>", line 1, in <module>
        reraise(*pickle.loads(s2))
      File "<doctest README.rst[8]>", line 2, in <module>
        inner_2()
      File "<doctest README.rst[5]>", line 2, in inner_2
        inner_1()
      File "<doctest README.rst[4]>", line 2, in inner_1
        inner_0()
      File "<doctest README.rst[3]>", line 2, in inner_0
        raise Exception('fail')
    Exception: fail
    >>> reraise(*pickle.loads(s3))
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[14]>", line 1, in <module>
        reraise(*pickle.loads(s2))
      File "<doctest README.rst[8]>", line 2, in <module>
        inner_2()
      File "<doctest README.rst[5]>", line 2, in inner_2
        inner_1()
      File "<doctest README.rst[4]>", line 2, in inner_1
        inner_0()
      File "<doctest README.rst[3]>", line 2, in inner_0
        raise Exception('fail')
    Exception: fail

Pickling Exceptions together with their traceback and chain (Python 3 only)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

::

    >>> try:  # doctest: +SKIP
    ...     try:
    ...         1 / 0
    ...     except Exception as e:
    ...         raise Exception("foo") from e
    ... except Exception as e:
    ...     s = pickle.dumps(e)
    >>> raise pickle.loads(s)  # doctest: +SKIP
    Traceback (most recent call last):
      File "<doctest README.rst[16]>", line 3, in <module>
        1 / 0
    ZeroDivisionError: division by zero

    The above exception was the direct cause of the following exception:

    Traceback (most recent call last):
      File "<doctest README.rst[17]>", line 1, in <module>
        raise pickle.loads(s)
      File "<doctest README.rst[16]>", line 5, in <module>
        raise Exception("foo") from e
    Exception: foo

BaseException subclasses defined after calling ``pickling_support.install()`` will
**not** retain their traceback and exception chain pickling.
To cover custom Exceptions, there are three options:

1. Use ``@pickling_support.install`` as a decorator for each custom Exception

    .. code-block:: python

        >>> from tblib import pickling_support
        >>> # Declare all imports of your package's dependencies
        >>> import numpy  # doctest: +SKIP

        >>> pickling_support.install()  # install for all modules imported so far

        >>> @pickling_support.install
        ... class CustomError(Exception):
        ...     pass

   Eventual subclasses of ``CustomError`` will need to be decorated again.

2. Invoke ``pickling_support.install()`` after all modules have been imported and all
   Exception subclasses have been declared

    .. code-block:: python

        >>> # Declare all imports of your package's dependencies
        >>> import numpy  # doctest: +SKIP
        >>> from tblib import pickling_support

        >>> # Declare your own custom Exceptions
        >>> class CustomError(Exception):
        ...     pass

        >>> # Finally, install tblib
        >>> pickling_support.install()

3. Selectively install tblib for Exception instances just before they are pickled

    .. code-block:: python

       pickling_support.install(<Exception instance>, [Exception instance], ...)

   The above will install tblib pickling for all listed exceptions as well as any other
   exceptions in their exception chains.

   For example, one could write a wrapper to be used with
   `ProcessPoolExecutor <https://docs.python.org/3/library/concurrent.futures.html>`_,
   `Dask.distributed <https://distributed.dask.org/>`_, or similar libraries:

::

    >>> from tblib import pickling_support
    >>> def wrapper(func, *args, **kwargs):
    ...     try:
    ...         return func(*args, **kwargs)
    ...     except Exception as e:
    ...         pickling_support.install(e)
    ...         raise

What if we have a local stack, does it show correctly ?
-------------------------------------------------------

Yes it does::

    >>> exc_info = pickle.loads(s3)
    >>> def local_0():
    ...     reraise(*exc_info)
    ...
    >>> def local_1():
    ...     local_0()
    ...
    >>> def local_2():
    ...     local_1()
    ...
    >>> local_2()
    Traceback (most recent call last):
      File "...doctest.py", line ..., in __run
        compileflags, 1) in test.globs
      File "<doctest README.rst[24]>", line 1, in <module>
        local_2()
      File "<doctest README.rst[23]>", line 2, in local_2
        local_1()
      File "<doctest README.rst[22]>", line 2, in local_1
        local_0()
      File "<doctest README.rst[21]>", line 2, in local_0
        reraise(*exc_info)
      File "<doctest README.rst[11]>", line 2, in <module>
        inner_2()
      File "<doctest README.rst[5]>", line 2, in inner_2
        inner_1()
      File "<doctest README.rst[4]>", line 2, in inner_1
        inner_0()
      File "<doctest README.rst[3]>", line 2, in inner_0
        raise Exception('fail')
    Exception: fail

It also supports more contrived scenarios
-----------------------------------------

Like tracebacks with syntax errors::

    >>> from tblib import Traceback
    >>> from examples import bad_syntax
    >>> try:
    ...     bad_syntax()
    ... except:
    ...     et, ev, tb = sys.exc_info()
    ...     tb = Traceback(tb)
    ...
    >>> reraise(et, ev, tb.as_traceback())
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[58]>", line 1, in <module>
        reraise(et, ev, tb.as_traceback())
      File "<doctest README.rst[57]>", line 2, in <module>
        bad_syntax()
      File "...tests...examples.py", line 18, in bad_syntax
        import badsyntax
      File "...tests...badsyntax.py", line 5
        is very bad
         ^
    SyntaxError: invalid syntax

Or other import failures::

    >>> from examples import bad_module
    >>> try:
    ...     bad_module()
    ... except:
    ...     et, ev, tb = sys.exc_info()
    ...     tb = Traceback(tb)
    ...
    >>> reraise(et, ev, tb.as_traceback())
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[61]>", line 1, in <module>
        reraise(et, ev, tb.as_traceback())
      File "<doctest README.rst[60]>", line 2, in <module>
        bad_module()
      File "...tests...examples.py", line 23, in bad_module
        import badmodule
      File "...tests...badmodule.py", line 3, in <module>
        raise Exception("boom!")
    Exception: boom!

Or a traceback that's caused by exceeding the recursion limit (here we're
forcing the type and value to have consistency across platforms)::

    >>> def f(): f()
    >>> try:
    ...    f()
    ... except RuntimeError:
    ...    et, ev, tb = sys.exc_info()
    ...    tb = Traceback(tb)
    ...
    >>> reraise(RuntimeError, RuntimeError("maximum recursion depth exceeded"), tb.as_traceback())
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[32]>", line 1, in f
        def f(): f()
      File "<doctest README.rst[32]>", line 1, in f
        def f(): f()
      File "<doctest README.rst[32]>", line 1, in f
        def f(): f()
      ...
    RuntimeError: maximum recursion depth exceeded

Reference
~~~~~~~~~

tblib.Traceback
---------------

It is used by the ``pickling_support``. You can use it too if you want more flexibility::

    >>> from tblib import Traceback
    >>> try:
    ...     inner_2()
    ... except:
    ...     et, ev, tb = sys.exc_info()
    ...     tb = Traceback(tb)
    ...
    >>> reraise(et, ev, tb.as_traceback())
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[21]>", line 6, in <module>
        reraise(et, ev, tb.as_traceback())
      File "<doctest README.rst[21]>", line 2, in <module>
        inner_2()
      File "<doctest README.rst[5]>", line 2, in inner_2
        inner_1()
      File "<doctest README.rst[4]>", line 2, in inner_1
        inner_0()
      File "<doctest README.rst[3]>", line 2, in inner_0
        raise Exception('fail')
    Exception: fail

tblib.Traceback.to_dict
```````````````````````

You can use the ``to_dict`` method and the ``from_dict`` classmethod to
convert a Traceback into and from a dictionary serializable by the stdlib
json.JSONDecoder::

    >>> import json
    >>> from pprint import pprint
    >>> try:
    ...     inner_2()
    ... except:
    ...     et, ev, tb = sys.exc_info()
    ...     tb = Traceback(tb)
    ...     tb_dict = tb.to_dict()
    ...     pprint(tb_dict)
    {'tb_frame': {'f_code': {'co_filename': '<doctest README.rst[...]>',
                             'co_name': '<module>'},
                  'f_globals': {'__name__': '__main__'},
                  'f_lineno': 5,
                  'f_locals': {}},
     'tb_lineno': 2,
     'tb_next': {'tb_frame': {'f_code': {'co_filename': ...,
                                         'co_name': 'inner_2'},
                              'f_globals': {'__name__': '__main__'},
                              'f_lineno': 2,
                              'f_locals': {}},
                 'tb_lineno': 2,
                 'tb_next': {'tb_frame': {'f_code': {'co_filename': ...,
                                                     'co_name': 'inner_1'},
                                          'f_globals': {'__name__': '__main__'},
                                          'f_lineno': 2,
                                          'f_locals': {}},
                             'tb_lineno': 2,
                             'tb_next': {'tb_frame': {'f_code': {'co_filename': ...,
                                                                 'co_name': 'inner_0'},
                                                      'f_globals': {'__name__': '__main__'},
                                                      'f_lineno': 2,
                                                      'f_locals': {}},
                                         'tb_lineno': 2,
                                         'tb_next': None}}}}

tblib.Traceback.from_dict
`````````````````````````

Building on the previous example::

    >>> tb_json = json.dumps(tb_dict)
    >>> tb = Traceback.from_dict(json.loads(tb_json))
    >>> reraise(et, ev, tb.as_traceback())
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[21]>", line 6, in <module>
        reraise(et, ev, tb.as_traceback())
      File "<doctest README.rst[21]>", line 2, in <module>
        inner_2()
      File "<doctest README.rst[5]>", line 2, in inner_2
        inner_1()
      File "<doctest README.rst[4]>", line 2, in inner_1
        inner_0()
      File "<doctest README.rst[3]>", line 2, in inner_0
        raise Exception('fail')
    Exception: fail

tblib.Traceback.from_string
```````````````````````````

::

    >>> tb = Traceback.from_string("""
    ... File "skipped.py", line 123, in func_123
    ... Traceback (most recent call last):
    ...   File "tests/examples.py", line 2, in func_a
    ...     func_b()
    ...   File "tests/examples.py", line 6, in func_b
    ...     func_c()
    ...   File "tests/examples.py", line 10, in func_c
    ...     func_d()
    ...   File "tests/examples.py", line 14, in func_d
    ... Doesn't: matter
    ... """)
    >>> reraise(et, ev, tb.as_traceback())
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[42]>", line 6, in <module>
        reraise(et, ev, tb.as_traceback())
      File "...examples.py", line 2, in func_a
        func_b()
      File "...examples.py", line 6, in func_b
        func_c()
      File "...examples.py", line 10, in func_c
        func_d()
      File "...examples.py", line 14, in func_d
        raise Exception('Guessing time !')
    Exception: fail


If you use the ``strict=False`` option then parsing is a bit more lax::

    >>> tb = Traceback.from_string("""
    ... File "bogus.py", line 123, in bogus
    ... Traceback (most recent call last):
    ...  File "tests/examples.py", line 2, in func_a
    ...   func_b()
    ...    File "tests/examples.py", line 6, in func_b
    ...     func_c()
    ...    File "tests/examples.py", line 10, in func_c
    ...   func_d()
    ...  File "tests/examples.py", line 14, in func_d
    ... Doesn't: matter
    ... """, strict=False)
    >>> reraise(et, ev, tb.as_traceback())
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[42]>", line 6, in <module>
        reraise(et, ev, tb.as_traceback())
      File "bogus.py", line 123, in bogus
      File "...examples.py", line 2, in func_a
        func_b()
      File "...examples.py", line 6, in func_b
        func_c()
      File "...examples.py", line 10, in func_c
        func_d()
      File "...examples.py", line 14, in func_d
        raise Exception('Guessing time !')
    Exception: fail

tblib.decorators.return_error
-----------------------------

::

    >>> from tblib.decorators import return_error
    >>> inner_2r = return_error(inner_2)
    >>> e = inner_2r()
    >>> e
    <tblib.decorators.Error object at ...>
    >>> e.reraise()
    Traceback (most recent call last):
      ...
      File "<doctest README.rst[26]>", line 1, in <module>
        e.reraise()
      File "...tblib...decorators.py", line 19, in reraise
        reraise(self.exc_type, self.exc_value, self.traceback)
      File "...tblib...decorators.py", line 25, in return_exceptions_wrapper
        return func(*args, **kwargs)
      File "<doctest README.rst[5]>", line 2, in inner_2
        inner_1()
      File "<doctest README.rst[4]>", line 2, in inner_1
        inner_0()
      File "<doctest README.rst[3]>", line 2, in inner_0
        raise Exception('fail')
    Exception: fail

How's this useful? Imagine you're using multiprocessing like this::

    # Note that Python 3.4 and later will show the remote traceback (but as a string sadly) so we skip testing this.
    >>> import traceback
    >>> from multiprocessing import Pool
    >>> from examples import func_a
    >>> pool = Pool()  # doctest: +SKIP
    >>> try:  # doctest: +SKIP
    ...     for i in pool.map(func_a, range(5)):
    ...         print(i)
    ... except:
    ...     print(traceback.format_exc())
    ...
    Traceback (most recent call last):
      File "<doctest README.rst[...]>", line 2, in <module>
        for i in pool.map(func_a, range(5)):
      File "...multiprocessing...pool.py", line ..., in map
        ...
      File "...multiprocessing...pool.py", line ..., in get
        ...
    Exception: Guessing time !
    <BLANKLINE>
    >>> pool.terminate()  # doctest: +SKIP

Not very useful is it? Let's sort this out::

    >>> from tblib.decorators import apply_with_return_error, Error
    >>> from itertools import repeat
    >>> pool = Pool()
    >>> try: # doctest: +SKIP
    ...     for i in pool.map(apply_with_return_error, zip(repeat(func_a), range(5))):
    ...         if isinstance(i, Error):
    ...             i.reraise()
    ...         else:
    ...             print(i)
    ... except:
    ...     print(traceback.format_exc())
    ...
    Traceback (most recent call last):
      File "<doctest README.rst[...]>", line 4, in <module>
        i.reraise()
      File "...tblib...decorators.py", line ..., in reraise
        reraise(self.exc_type, self.exc_value, self.traceback)
      File "...tblib...decorators.py", line ..., in reraise
        raise value.with_traceback(tb)
      File "...tblib...decorators.py", line ..., in return_exceptions_wrapper
        return func(*args, **kwargs)
      File "...tblib...decorators.py", line ..., in apply_with_return_error
        return args[0](*args[1:])
      File "...examples.py", line 2, in func_a
        func_b()
      File "...examples.py", line 6, in func_b
        func_c()
      File "...examples.py", line 10, in func_c
        func_d()
      File "...examples.py", line 14, in func_d
        raise Exception('Guessing time !')
    Exception: Guessing time !
    <BLANKLINE>
    >>> pool.terminate()

Much better !

What if we have a local call stack ?
````````````````````````````````````

::

    >>> def local_0():
    ...     pool = Pool()
    ...     try:
    ...         for i in pool.map(apply_with_return_error, zip(repeat(func_a), range(5))):
    ...             if isinstance(i, Error):
    ...                 i.reraise()
    ...             else:
    ...                 print(i)
    ...     finally:
    ...         pool.close()
    ...
    >>> def local_1():
    ...     local_0()
    ...
    >>> def local_2():
    ...     local_1()
    ...
    >>> try: # doctest: +SKIP
    ...     local_2()
    ... except:
    ...     print(traceback.format_exc())
    ...
    Traceback (most recent call last):
      File "<doctest README.rst[...]>", line 2, in <module>
        local_2()
      File "<doctest README.rst[...]>", line 2, in local_2
        local_1()
      File "<doctest README.rst[...]>", line 2, in local_1
        local_0()
      File "<doctest README.rst[...]>", line 6, in local_0
        i.reraise()
      File "...tblib...decorators.py", line ..., in reraise
        reraise(self.exc_type, self.exc_value, self.traceback)
      File "...tblib...decorators.py", line ..., in reraise
        raise value.with_traceback(tb)
      File "...tblib...decorators.py", line ..., in return_exceptions_wrapper
        return func(*args, **kwargs)
      File "...tblib...decorators.py", line ..., in apply_with_return_error
        return args[0](*args[1:])
      File "...tests...examples.py", line 2, in func_a
        func_b()
      File "...tests...examples.py", line 6, in func_b
        func_c()
      File "...tests...examples.py", line 10, in func_c
        func_d()
      File "...tests...examples.py", line 14, in func_d
        raise Exception('Guessing time !')
    Exception: Guessing time !
    <BLANKLINE>

Other weird stuff
`````````````````

Clearing traceback works (Python 3.4 and up)::

    >>> tb = Traceback.from_string("""
    ... File "skipped.py", line 123, in func_123
    ... Traceback (most recent call last):
    ...   File "tests/examples.py", line 2, in func_a
    ...     func_b()
    ...   File "tests/examples.py", line 6, in func_b
    ...     func_c()
    ...   File "tests/examples.py", line 10, in func_c
    ...     func_d()
    ...   File "tests/examples.py", line 14, in func_d
    ... Doesn't: matter
    ... """)
    >>> import traceback, sys
    >>> if sys.version_info > (3, 4):
    ...     traceback.clear_frames(tb)

Credits
=======

* `mitsuhiko/jinja2 <https://github.com/mitsuhiko/jinja2>`_ for figuring a way to create traceback objects.


Changelog
=========

3.2.2 (2025-11-12)
~~~~~~~~~~~~~~~~~~

* Fixed regression occurring with ``TimeoutError`` exceptions. They should be represented now exactly as the original when unpickling.
  Contributed by Jacob Tomlinson in `#85 <https://github.com/ionelmc/python-tblib/pull/85>`_.

3.2.1 (2025-10-31)
~~~~~~~~~~~~~~~~~~

* Fixed regression occurring with ``ExceptionGroup`` exceptions. That exception type is now handled specifically in the new ``unpickle_exception_with_attrs`` function (just like ``OSError``).

3.2.0 (2025-10-21)
~~~~~~~~~~~~~~~~~~

* Changed ``tblib.pickling_support.install`` to support exceptions with ``__init__`` that does match the default
  ``BaseException.__reduce__`` (as it expects the positional arguments to ``__init__`` to match the ``args`` attribute).

  Special handling for OSError (and subclasses) is also included. The errno, strerror, winerror, filename and filename2 attributes will be added in the reduce structure (if set).

  This will support exception subclasses that do this without defining a custom ``__reduce__``:

  .. code-block:: python

    def __init__(self):
        super().__init__('mistery argument')

    def __init__(self, mistery_argument):
        super().__init__()
        self.mistery_argument = mistery_argument

  Tests and POC contributed by Oldřich Jedlička in `#73 <https://github.com/ionelmc/python-tblib/pull/73>`_.
* Fixed some doctest and coverage config. Contributed by Colin Watson in `#79 <https://github.com/ionelmc/python-tblib/pull/79>`_.


3.1.0 (2025-03-31)
~~~~~~~~~~~~~~~~~~

* Improved performance of ``as_traceback`` by a large factor.
  Contributed by Haoyu Weng in `#81 <https://github.com/ionelmc/python-tblib/pull/81>`_.
* Dropped support for now-EOL Python 3.8 and added 3.13 in the test grid.

3.0.0 (2023-10-22)
~~~~~~~~~~~~~~~~~~

* Added support for  ``__context__``, ``__suppress_context__`` and ``__notes__``.
  Contributed by Tim Maxwell in `#72 <https://github.com/ionelmc/python-tblib/pull/72>`_.
* Added the ``get_locals`` argument to ``tblib.pickling_support.install()``, ``tblib.Traceback`` and ``tblib.Frame``.
  Fixes `#41 <https://github.com/ionelmc/python-tblib/issues/41>`_.
* Dropped support for now-EOL Python 3.7 and added 3.12 in the test grid.

2.0.0 (2023-06-22)
~~~~~~~~~~~~~~~~~~

* Removed support for legacy Pythons (2.7 and 3.6) and added Python 3.11 in the test grid.
* Some cleanups and refactors (mostly from ruff).

1.7.0 (2020-07-24)
~~~~~~~~~~~~~~~~~~

* Add more attributes to ``Frame`` and ``Code`` objects for pytest compatibility. Contributed by Ivanq in
  `#58 <https://github.com/ionelmc/python-tblib/pull/58>`_.

1.6.0 (2019-12-07)
~~~~~~~~~~~~~~~~~~

* When pickling an Exception, also pickle its traceback and the Exception chain
  (``raise ... from ...``). Contributed by Guido Imperiale in
  `#53 <https://github.com/ionelmc/python-tblib/issues/53>`_.

1.5.0 (2019-10-23)
~~~~~~~~~~~~~~~~~~

* Added support for Python 3.8. Contributed by Victor Stinner in
  `#42 <https://github.com/ionelmc/python-tblib/issues/42>`_.
* Removed support for end of life Python 3.4.
* Few CI improvements and fixes.

1.4.0 (2019-05-02)
~~~~~~~~~~~~~~~~~~

* Removed support for end of life Python 3.3.
* Fixed tests for Python 3.7. Contributed by Elliott Sales de Andrade in
  `#36 <https://github.com/ionelmc/python-tblib/issues/36>`_.
* Fixed compatibility issue with Twised (``twisted.python.failure.Failure`` expected a ``co_code`` attribute).

1.3.2 (2017-04-09)
~~~~~~~~~~~~~~~~~~

* Add support for PyPy3.5-5.7.1-beta. Previously ``AttributeError:
  'Frame' object has no attribute 'clear'``  could be raised. See PyPy
  issue `#2532 <https://github.com/pypy/pypy/issues/2532>`_.

1.3.1 (2017-03-27)
~~~~~~~~~~~~~~~~~~

* Fixed handling for tracebacks due to exceeding the recursion limit.
  Fixes `#15 <https://github.com/ionelmc/python-tblib/issues/15>`_.

1.3.0 (2016-03-08)
~~~~~~~~~~~~~~~~~~

* Added ``Traceback.from_string``.

1.2.0 (2015-12-18)
~~~~~~~~~~~~~~~~~~

* Fixed handling for tracebacks from generators and other internal improvements
  and optimizations. Contributed by DRayX in `#10 <https://github.com/ionelmc/python-tblib/issues/10>`_
  and `#11 <https://github.com/ionelmc/python-tblib/pull/11>`_.

1.1.0 (2015-07-27)
~~~~~~~~~~~~~~~~~~

* Added support for Python 2.6. Contributed by Arcadiy Ivanov in
  `#8 <https://github.com/ionelmc/python-tblib/pull/8>`_.

1.0.0 (2015-03-30)
~~~~~~~~~~~~~~~~~~

* Added ``to_dict`` method and ``from_dict`` classmethod on Tracebacks.
  Contributed by beckjake in `#5 <https://github.com/ionelmc/python-tblib/pull/5>`_.