Package: pymstache
PystachePystacheis a Python
implementation ofMustache. Mustache is
a framework-agnostic, logic-free templating system inspired byctemplateandet.
Like ctemplate, Mustache “emphasizes separating logic from presentation:
it is impossible to embed application logic in this template language.”Themustache(5)man page
provides a good introduction to Mustache’s syntax. For a more complete
(and more current) description of Mustache’s behavior, see the officialMustache spec.Pystache issemantically versionedand can be
found onPyPI. This version of
Pystache passes all tests inversion
1.1.2of the spec.RequirementsPystache is tested with–Python 2.4 (requires simplejsonversion
2.0.9or earlier)Python 2.5 (requiressimplejson)Python 2.6Python 2.7Python 3.1Python 3.2Python 3.3PyPyDistribute(the setuptools
fork) is recommended oversetuptools, and is required
in some cases (e.g. for Python 3 support). If you usepip, you probably already satisfy
this requirement.JSON support is needed only for the command-line interface and to run
the spec tests. We require simplejson for earlier versions of Python
since Python’sjsonmodule
was added in Python 2.6.For Python 2.4 we require an earlier version of simplejson since
simplejson stopped officially supporting Python 2.4 in simplejson
version 2.1.0. Earlier versions of simplejson can be installed manually,
as follows:pip install 'simplejson<2.1.0'Official support for Python 2.4 will end with Pystache version 0.6.0.Install Itpip install pystacheAnd test it–pystache-testTo install and test from source (e.g. from GitHub), see the Develop
section.Use It>>> import pystache
>>> print pystache.render('Hi {{person}}!', {'person': 'Mom'})
Hi Mom!You can also create dedicated view classes to hold your view logic.Here’s your view class (in …/examples/readme.py):class SayHello(object):
    def to(self):
        return "Pizza"Instantiating like so:>>> from pystache.tests.examples.readme import SayHello
>>> hello = SayHello()Then your template, say_hello.mustache (by default in the same
directory as your class definition):Hello, {{to}}!Pull it together:>>> renderer = pystache.Renderer()
>>> print renderer.render(hello)
Hello, Pizza!For greater control over rendering (e.g. to specify a custom template
directory), use theRendererclass like above. One can pass
attributes to the Renderer class constructor or set them on a Renderer
instance. To customize template loading on a per-view basis, subclassTemplateSpec. See the docstrings of theRendererclass andTemplateSpecclass for more information.You can also pre-parse a template:>>> parsed = pystache.parse(u"Hey {{#who}}{{.}}!{{/who}}")
>>> print parsed
[u'Hey ', _SectionNode(key=u'who', index_begin=12, index_end=18, parsed=[_EscapeNode(key=u'.'), u'!'])]And then:>>> print renderer.render(parsed, {'who': 'Pops'})
Hey Pops!
>>> print renderer.render(parsed, {'who': 'you'})
Hey you!Python 3Pystache has supported Python 3 since version 0.5.1. Pystache behaves
slightly differently between Python 2 and 3, as follows:In Python 2, the default html-escape functioncgi.escape()does
not escape single quotes. In Python 3, the default escape functionhtml.escape()does escape single quotes.In both Python 2 and 3, the string and file encodings default tosys.getdefaultencoding(). However, this function can return
different values under Python 2 and 3, even when run from the same
system. Check your own system for the behavior on your system, or do
not rely on the defaults by passing in the encodings explicitly (e.g.
to theRendererclass).UnicodeThis section describes how Pystache handles unicode, strings, and
encodings.Internally, Pystache usesonly unicode
strings(strin Python 3 andunicodein Python 2). For input, Pystache
accepts both unicode strings and byte strings (bytesin Python 3 andstrin Python 2). For output, Pystache’s template rendering methods
return only unicode.Pystache’sRendererclass supports a number of attributes to control
how Pystache converts byte strings to unicode on input. These include
thefile_encoding,string_encoding, anddecode_errorsattributes.Thefile_encodingattribute is the encoding the renderer uses to
convert to unicode any files read from the file system. Similarly,string_encodingis the encoding the renderer uses to convert any
other byte strings encountered during the rendering process into unicode
(e.g. context values that are encoded byte strings).Thedecode_errorsattribute is what the renderer passes as theerrorsargument to Python’s built-in unicode-decoding function
(str()in Python 3 andunicode()in Python 2). The valid values
for this argument arestrict,ignore, andreplace.Each of these attributes can be set via theRendererclass’s
constructor using a keyword argument of the same name. See the Renderer
class’s docstrings for further details. In addition, thefile_encodingattribute can be controlled on a per-view basis by
subclassing theTemplateSpecclass. When not specified explicitly,
these attributes default to values set in Pystache’sdefaultsmodule.DevelopTo test from a source distribution (without installing)–python test_pystache.pyTo test Pystache with multiple versions of Python (with a single
command!), you can usetox:pip install 'virtualenv<1.8'  # Version 1.8 dropped support for Python 2.4.
pip install 'tox<1.4'  # Version 1.4 dropped support for Python 2.4.
toxIf you do not have all Python versions listed intox.ini–tox -e py26,py32  # for exampleThe source distribution tests also include doctests and tests from the
Mustache spec. To include tests from the Mustache spec in your test
runs:git submodule init
git submodule updateThe test harness parses the spec’s (more human-readable) yaml files ifPyYAMLis present. Otherwise, it
parses the json files. To install PyYAML–pip install pyyamlTo run a subset of the tests, you can usenose:pip install nose
nosetests --tests pystache/tests/test_context.py:GetValueTests.test_dictionary__key_presentUsing Python 3 with Pystache from sourcePystache is written in Python 2 and must be converted to Python 3 prior
to using it with Python 3. The installation process (and tox) do this
automatically.To convert the code to Python 3 manually (while using Python 3)–python setup.py buildThis writes the converted code to a subdirectory calledbuild. By
design, Python 3 buildscannotbe created from Python 2.To convert the code without using setup.py, you can use2to3as follows (two
steps)–2to3 --write --nobackups --no-diffs --doctests_only pystache
2to3 --write --nobackups --no-diffs pystacheThis converts the code (and doctests) in place.Toimport pystachefrom a source distribution while using Python 3,
be sure that you are importing from a directory containing a converted
version of the code (e.g. from thebuilddirectory after
converting), and not from the original (unconverted) source directory.
Otherwise, you will get a syntax error. You can help prevent this by not
running the Python IDE from the project directory when importing
Pystache while using Python 3.Mailing ListThere is amailing list.
Note that there is a bit of a delay between posting a message and seeing
it appear in the mailing list archive.Credits>>> context = { 'author': 'Chris Wanstrath', 'maintainer': 'Chris Jerdonek' }
>>> print pystache.render("Author: {{author}}\nMaintainer: {{maintainer}}", context)
Author: Chris Wanstrath
Maintainer: Chris JerdonekPystache logo byDavid Phillipsis
licensed under aCreative Commons Attribution-ShareAlike 3.0 Unported
License.HistoryNote:Official support for Python 2.4 will end with Pystache version
0.6.0.0.5.3 (2012-11-03)Added ability to customize string coercion (e.g. to have None render
as'') (issue #130).Added Renderer.render_name() to render a template by name (issue
#122).Added TemplateSpec.template_path to specify an absolute path to a
template (issue #41).Added option of raising errors on missing tags/partials:Renderer(missing_tags='strict')(issue #110).Added support for finding and loading templates by file name in
addition to by template name (issue #127). [xgecko]Added aparse()function that yields a printable, pre-compiled
parse tree.Added support for rendering pre-compiled templates.Added Python 3.3 to the list of supported versions.Added support forPyPy(issue #125).Added support forTravis CI(issue #124).
[msabramo]Bugfix:defaults.DELIMITERScan now be changed at runtime (issue
#135). [bennoleslie]Bugfix: exceptions raised from a property are no longer swallowed
when getting a key from a context stack (issue #110).Bugfix: lambda section values can now return non-ascii, non-unicode
strings (issue #118).Bugfix: allowtest_pystache.pyandtoxto pass when run from
a downloaded sdist (i.e. without the spec test directory).Convert HISTORY and README files from reST to Markdown.More robust handling of byte strings in Python 3.Added Creative Commons license for David Phillips’s logo.0.5.2 (2012-05-03)Added support for dot notation and version 1.1.2 of the spec (issue
#99). [rbp]Missing partials now render as empty string per latest version of
spec (issue #115).Bugfix: falsey values now coerced to strings using str().Bugfix: lambda return values for sections no longer pushed onto
context stack (issue #113).Bugfix: lists of lambdas for sections were not rendered (issue #114).0.5.1 (2012-04-24)Added support for Python 3.1 and 3.2.Added tox support to test multiple Python versions.Added test script entry point: pystache-test.Added __version__ package attribute.Test harness now supports both YAML and JSON forms of Mustache spec.Test harness no longer requires nose.0.5.0 (2012-04-03)This version represents a major rewrite and refactoring of the code base
that also adds features and fixes many bugs. All functionality and
nearly all unit tests have been preserved. However, some backwards
incompatible changes to the API have been made.Below is a selection of some of the changes (not exhaustive).Highlights:Pystache now passes all tests in version 1.0.3 of theMustache
spec. [pvande]Removed View class: it is no longer necessary to subclass from View
or from any other class to create a view.Replaced Template with Renderer class: template rendering behavior
can be modified via the Renderer constructor or by setting attributes
on a Renderer instance.Added TemplateSpec class: template rendering can be specified on a
per-view basis by subclassing from TemplateSpec.Introduced separation of concerns and removed circular dependencies
(e.g. between Template and View classes, cf.issue
#13).Unicode now used consistently throughout the rendering process.Expanded test coverage: nosetests now runs doctests and ~105 test
cases from the Mustache spec (increasing the number of tests from 56
to ~315).Added a rudimentary benchmarking script to gauge performance while
refactoring.Extensive documentation added (e.g. docstrings).Other changes:Added a command-line interface. [vrde]The main rendering class now accepts a custom partial loader (e.g. a
dictionary) and a custom escape function.Non-ascii characters in str strings are now supported while
rendering.Added string encoding, file encoding, and errors options for decoding
to unicode.Removed the output encoding option.Removed the use of markupsafe.Bug fixes:Context values no longer processed as template strings.
[jakearchibald]Whitespace surrounding sections is no longer altered, per the spec.
[heliodor]Zeroes now render correctly when using PyPy. [alex]Multline comments now permitted. [fczuardi]Extensionless template files are now supported.Passing**kwargstoTemplate()no longer modifies the
context.Passing**kwargstoTemplate()with no context no longer
raises an exception.0.4.1 (2012-03-25)Added support for Python 2.4. [wangtz, jvantuyl]0.4.0 (2011-01-12)Add support for nested contexts (within template and view)Add support for inverted listsDecoupled template loading0.3.1 (2010-05-07)Fix package0.3.0 (2010-05-03)View.template_path can now hold a list of pathAdd {{& blah}} as an alias for {{{ blah }}}Higher Order SectionsInverted sections0.2.0 (2010-02-15)Bugfix: Methods returning False or None are not renderedBugfix: Don’t render an empty string when a tag’s value is 0.
[enaeseth]Add support for using non-callables as View attributes.
[joshthecoder]Allow using View instances as attributes. [joshthecoder]Support for Unicode and non-ASCII-encoded bytestring output.
[enaeseth]Template file encoding awareness. [enaeseth]0.1.1 (2009-11-13)Ensure we’re dealing with strings, alwaysTests can be run by executing the test file directly0.1.0 (2009-11-12)First releaseLicenseCopyright (C) 2012 Chris Jerdonek. All rights reserved.Copyright (c) 2009 Chris WanstrathPermission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
“Software”), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.