Python dict with stacked context data
Free software: MIT license
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.
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