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Description:

pycontext 0.3.1

Python dict with stacked context data

Free software: MIT license
GitHub: https://github.com/dealertrack/py-context

Installing
You can install py-context using pip:
$ pip install py-context

Example
>>> context = Context({'user': 'Fred', 'city': 'Bedrock'})
>>> context['user']
'Fred'
>>> context['city']
'Bedrock'
>>> context.push({'user': 'Barney'})
>>> context['user']
'Barney'
>>> context['city']
'Bedrock'
>>> context.pop()
{'user': 'Barney'}
>>> context['user']
'Fred'
Context also supports signals.
Signal handler can be attached globally:
>>> @context_key_changed.connect
... def handler(sender, context, key, new, old):
... print(key, new, old)

>>> context = Context()
>>> context['hello'] = 'world'
hello world <Missing>
Or to individual context instances:
>>> def handler(sender, context, key, new, old):
... print(key, new, old)
>>> context = Context()
>>> context_key_changed.connect(handler, sender=context)
Supported signals:
>>> @context_initialized.connect
... def handler(sender, context):
... pass

>>> @pre_context_changed.connect
... def handler(sender, context):
... pass

>>> @post_context_changed.connect
... def handler(sender, context):
... pass

>>> @context_key_changed.connect
... def handler(sender, context, key, new, old):
... pass
Additionally, ClassSignallingContext can be used to subscribe signals
by sender classes, not instances:
>>> class TestContext(ClassSignallingContext):
... pass
>>> def context_key_changed_handler(sender, context, key, new, old):
... print(key, new, old)
>>> _ = context_key_changed.connect(context_key_changed_handler, sender=TestContext)

>>> context = Context()
>>> class_context = TestContext()

>>> context['foo'] = 'bar'
>>> class_context['foo'] = 'bar'
foo bar <Missing>

Testing
To run the tests you need to install testing requirements first:
$ make install
Then to run tests, you can use nosetests or simply use Makefile command:
$ nosetests -sv
# or
$ make test

History

0.3.1 (2018-04-11)

Added support for *args, **kwargs in Context.push().
Added __dir__ support.

0.3.0 (2018-02-16)

Added signals support - context_initialized, pre_context_changed,
post_context_changed and context_key_changed. See README for examples.

0.2.1 (2017-07-28)

Excluding tests from being installed

0.2.0 (2017-05-11)

Add attribute support
Add make watch target

0.1.0 (2017-03-22)

First release on PyPI.

Credits
Originally Context was taken from Genshi project.
See LICENSE for copyright notices.

Development Lead

Miroslav Shubernetskiy - https://github.com/miki725

Contributors

Serkan Hosca - https://github.com/shosca

Copyright (C) 2006-2010 Edgewall Software
Copyright (C) 2017 Dealertrack Technologies, Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. The name of the author may not be used to endorse or promote
products derived from this software without specific prior
written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.