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Name: tblib
Version: 1.2.0
Summary: Traceback fiddling library. For now allows you to pickle 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).
Home-page: https://github.com/ionelmc/python-tblib
Author: Ionel Cristian Mărieș
Author-email: contact@ionelmc.ro
License: BSD
Description: =====
tblib
=====
.. list-table::
:stub-columns: 1
* - docs
- |docs|
* - tests
- | |travis| |appveyor| |requires|
| |coveralls| |codecov|
| |landscape| |scrutinizer| |codacy| |codeclimate|
* - package
- |version| |downloads| |wheel| |supported-versions| |supported-implementations|
.. |docs| image:: https://readthedocs.org/projects/python-tblib/badge/?style=flat
:target: https://readthedocs.org/projects/python-tblib
:alt: Documentation Status
.. |travis| image:: https://travis-ci.org/ionelmc/python-tblib.svg?branch=master
:alt: Travis-CI Build Status
:target: https://travis-ci.org/ionelmc/python-tblib
.. |appveyor| image:: https://ci.appveyor.com/api/projects/status/github/ionelmc/python-tblib?branch=master&svg=true
:alt: AppVeyor Build Status
:target: https://ci.appveyor.com/project/ionelmc/python-tblib
.. |requires| image:: https://requires.io/github/ionelmc/python-tblib/requirements.svg?branch=master
:alt: Requirements Status
:target: https://requires.io/github/ionelmc/python-tblib/requirements/?branch=master
.. |coveralls| image:: https://coveralls.io/repos/ionelmc/python-tblib/badge.svg?branch=master&service=github
:alt: Coverage Status
:target: https://coveralls.io/r/ionelmc/python-tblib
.. |codecov| image:: https://codecov.io/github/ionelmc/python-tblib/coverage.svg?branch=master
:alt: Coverage Status
:target: https://codecov.io/github/ionelmc/python-tblib
.. |landscape| image:: https://landscape.io/github/ionelmc/python-tblib/master/landscape.svg?style=flat
:target: https://landscape.io/github/ionelmc/python-tblib/master
:alt: Code Quality Status
.. |codacy| image:: https://img.shields.io/codacy/REPLACE_WITH_PROJECT_ID.svg?style=flat
:target: https://www.codacy.com/app/ionelmc/python-tblib
:alt: Codacy Code Quality Status
.. |codeclimate| image:: https://codeclimate.com/github/ionelmc/python-tblib/badges/gpa.svg
:target: https://codeclimate.com/github/ionelmc/python-tblib
:alt: CodeClimate Quality Status
.. |version| image:: https://img.shields.io/pypi/v/tblib.svg?style=flat
:alt: PyPI Package latest release
:target: https://pypi.python.org/pypi/tblib
.. |downloads| image:: https://img.shields.io/pypi/dm/tblib.svg?style=flat
:alt: PyPI Package monthly downloads
:target: https://pypi.python.org/pypi/tblib
.. |wheel| image:: https://img.shields.io/pypi/wheel/tblib.svg?style=flat
:alt: PyPI Wheel
:target: https://pypi.python.org/pypi/tblib
.. |supported-versions| image:: https://img.shields.io/pypi/pyversions/tblib.svg?style=flat
:alt: Supported versions
:target: https://pypi.python.org/pypi/tblib
.. |supported-implementations| image:: https://img.shields.io/pypi/implementation/tblib.svg?style=flat
:alt: Supported implementations
:target: https://pypi.python.org/pypi/tblib
.. |scrutinizer| image:: https://img.shields.io/scrutinizer/g/ionelmc/python-tblib/master.svg?style=flat
:alt: Scrutinizer Status
:target: https://scrutinizer-ci.com/g/ionelmc/python-tblib/
Traceback fiddling library. For now allows you to pickle 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).
* Free software: BSD license
Installation
============
::
pip install tblib
Documentation
=============
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
----------
::
>>> 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 six 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
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
The tblib.Traceback object
--------------------------
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
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 tblib import Traceback
>>> 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[30]>',
'co_name': '<module>'},
'f_globals': {'__name__': '__main__'}},
'tb_lineno': 2,
'tb_next': {'tb_frame': {'f_code': {'co_filename': ...
'co_name': 'inner_2'},
'f_globals': {'__name__': '__main__'}},
'tb_lineno': 2,
'tb_next': {'tb_frame': {'f_code': {'co_filename': ...
'co_name': 'inner_1'},
'f_globals': {'__name__': '__main__'}},
'tb_lineno': 2,
'tb_next': {'tb_frame': {'f_code': {'co_filename': ...
'co_name': 'inner_0'},
'f_globals': {'__name__': '__main__'}},
'tb_lineno': 2,
'tb_next': None}}}}
>>> 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
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::
>>> import traceback
>>> from multiprocessing import Pool
>>> from examples import func_a
>>> if sys.version_info[:2] >= (3, 4):
... import multiprocessing.pool
... # Undo the fix for http://bugs.python.org/issue13831 so that we can see the effects of our change.
... # because Python 3.4 will show the remote traceback (but as a string sadly)
... multiprocessing.pool.ExceptionWithTraceback = lambda e, t: e
>>> pool = Pool()
>>> try:
... 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()
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:
... 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 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 5, in func_b
func_c()
File "...examples.py", line 8, in func_c
func_d()
File "...examples.py", line 11, 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()
... for i in pool.map(apply_with_return_error, zip(repeat(func_a), range(5))):
... if isinstance(i, Error):
... i.reraise()
... else:
... print(i)
...
>>> def local_1():
... local_0()
...
>>> def local_2():
... local_1()
...
>>> try:
... 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 5, in local_0
i.reraise()
File "...tblib...decorators.py", line 20, in reraise
reraise(self.exc_type, self.exc_value, self.traceback)
File "...tblib...decorators.py", line 27, in return_exceptions_wrapper
return func(*args, **kwargs)
File "...tblib...decorators.py", line 47, 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 5, in func_b
func_c()
File "...tests...examples.py", line 8, in func_c
func_d()
File "...tests...examples.py", line 11, in func_d
raise Exception("Guessing time !")
Exception: Guessing time !
<BLANKLINE>
Credits
=======
* `mitsuhiko/jinja2 <https://github.com/mitsuhiko/jinja2>`_ for figuring a way to create traceback objects.
Changelog
=========
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>`_.
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Operating System :: Unix
Classifier: Operating System :: POSIX
Classifier: Operating System :: Microsoft :: Windows
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.3
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Topic :: Utilities
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