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diff --git a/third_party/python/pyrsistent/README.rst b/third_party/python/pyrsistent/README.rst new file mode 100644 index 0000000000..a4c24e49bd --- /dev/null +++ b/third_party/python/pyrsistent/README.rst @@ -0,0 +1,725 @@ +Pyrsistent +========== +.. image:: https://travis-ci.org/tobgu/pyrsistent.png?branch=master + :target: https://travis-ci.org/tobgu/pyrsistent + +.. image:: https://badge.fury.io/py/pyrsistent.svg + :target: https://badge.fury.io/py/pyrsistent + +.. image:: https://coveralls.io/repos/tobgu/pyrsistent/badge.svg?branch=master&service=github + :target: https://coveralls.io/github/tobgu/pyrsistent?branch=master + + +.. _Pyrthon: https://www.github.com/tobgu/pyrthon/ + +Pyrsistent is a number of persistent collections (by some referred to as functional data structures). Persistent in +the sense that they are immutable. + +All methods on a data structure that would normally mutate it instead return a new copy of the structure containing the +requested updates. The original structure is left untouched. + +This will simplify the reasoning about what a program does since no hidden side effects ever can take place to these +data structures. You can rest assured that the object you hold a reference to will remain the same throughout its +lifetime and need not worry that somewhere five stack levels below you in the darkest corner of your application +someone has decided to remove that element that you expected to be there. + +Pyrsistent is influenced by persistent data structures such as those found in the standard library of Clojure. The +data structures are designed to share common elements through path copying. +It aims at taking these concepts and make them as pythonic as possible so that they can be easily integrated into any python +program without hassle. + +If you want to go all in on persistent data structures and use literal syntax to define them in your code rather +than function calls check out Pyrthon_. + +Examples +-------- +.. _Sequence: collections_ +.. _Hashable: collections_ +.. _Mapping: collections_ +.. _Mappings: collections_ +.. _Set: collections_ +.. _collections: https://docs.python.org/3/library/collections.abc.html +.. _documentation: http://pyrsistent.readthedocs.org/ + +The collection types and key features currently implemented are: + +* PVector_, similar to a python list +* PMap_, similar to dict +* PSet_, similar to set +* PRecord_, a PMap on steroids with fixed fields, optional type and invariant checking and much more +* PClass_, a Python class fixed fields, optional type and invariant checking and much more +* `Checked collections`_, PVector, PMap and PSet with optional type and invariance checks and more +* PBag, similar to collections.Counter +* PList, a classic singly linked list +* PDeque, similar to collections.deque +* Immutable object type (immutable) built on the named tuple +* freeze_ and thaw_ functions to convert between pythons standard collections and pyrsistent collections. +* Flexible transformations_ of arbitrarily complex structures built from PMaps and PVectors. + +Below are examples of common usage patterns for some of the structures and features. More information and +full documentation for all data structures is available in the documentation_. + +.. _PVector: + +PVector +~~~~~~~ +With full support for the Sequence_ protocol PVector is meant as a drop in replacement to the built in list from a readers +point of view. Write operations of course differ since no in place mutation is done but naming should be in line +with corresponding operations on the built in list. + +Support for the Hashable_ protocol also means that it can be used as key in Mappings_. + +Appends are amortized O(1). Random access and insert is log32(n) where n is the size of the vector. + +.. code:: python + + >>> from pyrsistent import v, pvector + + # No mutation of vectors once created, instead they + # are "evolved" leaving the original untouched + >>> v1 = v(1, 2, 3) + >>> v2 = v1.append(4) + >>> v3 = v2.set(1, 5) + >>> v1 + pvector([1, 2, 3]) + >>> v2 + pvector([1, 2, 3, 4]) + >>> v3 + pvector([1, 5, 3, 4]) + + # Random access and slicing + >>> v3[1] + 5 + >>> v3[1:3] + pvector([5, 3]) + + # Iteration + >>> list(x + 1 for x in v3) + [2, 6, 4, 5] + >>> pvector(2 * x for x in range(3)) + pvector([0, 2, 4]) + +.. _PMap: + +PMap +~~~~ +With full support for the Mapping_ protocol PMap is meant as a drop in replacement to the built in dict from a readers point +of view. Support for the Hashable_ protocol also means that it can be used as key in other Mappings_. + +Random access and insert is log32(n) where n is the size of the map. + +.. code:: python + + >>> from pyrsistent import m, pmap, v + + # No mutation of maps once created, instead they are + # "evolved" leaving the original untouched + >>> m1 = m(a=1, b=2) + >>> m2 = m1.set('c', 3) + >>> m3 = m2.set('a', 5) + >>> m1 + pmap({'a': 1, 'b': 2}) + >>> m2 + pmap({'a': 1, 'c': 3, 'b': 2}) + >>> m3 + pmap({'a': 5, 'c': 3, 'b': 2}) + >>> m3['a'] + 5 + + # Evolution of nested persistent structures + >>> m4 = m(a=5, b=6, c=v(1, 2)) + >>> m4.transform(('c', 1), 17) + pmap({'a': 5, 'c': pvector([1, 17]), 'b': 6}) + >>> m5 = m(a=1, b=2) + + # Evolve by merging with other mappings + >>> m5.update(m(a=2, c=3), {'a': 17, 'd': 35}) + pmap({'a': 17, 'c': 3, 'b': 2, 'd': 35}) + >>> pmap({'x': 1, 'y': 2}) + pmap({'y': 3, 'z': 4}) + pmap({'y': 3, 'x': 1, 'z': 4}) + + # Dict-like methods to convert to list and iterate + >>> m3.items() + pvector([('a', 5), ('c', 3), ('b', 2)]) + >>> list(m3) + ['a', 'c', 'b'] + +.. _PSet: + +PSet +~~~~ +With full support for the Set_ protocol PSet is meant as a drop in replacement to the built in set from a readers point +of view. Support for the Hashable_ protocol also means that it can be used as key in Mappings_. + +Random access and insert is log32(n) where n is the size of the set. + +.. code:: python + + >>> from pyrsistent import s + + # No mutation of sets once created, you know the story... + >>> s1 = s(1, 2, 3, 2) + >>> s2 = s1.add(4) + >>> s3 = s1.remove(1) + >>> s1 + pset([1, 2, 3]) + >>> s2 + pset([1, 2, 3, 4]) + >>> s3 + pset([2, 3]) + + # Full support for set operations + >>> s1 | s(3, 4, 5) + pset([1, 2, 3, 4, 5]) + >>> s1 & s(3, 4, 5) + pset([3]) + >>> s1 < s2 + True + >>> s1 < s(3, 4, 5) + False + +.. _PRecord: + +PRecord +~~~~~~~ +A PRecord is a PMap with a fixed set of specified fields. Records are declared as python classes inheriting +from PRecord. Because it is a PMap it has full support for all Mapping methods such as iteration and element +access using subscript notation. + +.. code:: python + + >>> from pyrsistent import PRecord, field + >>> class ARecord(PRecord): + ... x = field() + ... + >>> r = ARecord(x=3) + >>> r + ARecord(x=3) + >>> r.x + 3 + >>> r.set(x=2) + ARecord(x=2) + >>> r.set(y=2) + Traceback (most recent call last): + AttributeError: 'y' is not among the specified fields for ARecord + +Type information +**************** +It is possible to add type information to the record to enforce type checks. Multiple allowed types can be specified +by providing an iterable of types. + +.. code:: python + + >>> class BRecord(PRecord): + ... x = field(type=int) + ... y = field(type=(int, type(None))) + ... + >>> BRecord(x=3, y=None) + BRecord(y=None, x=3) + >>> BRecord(x=3.0) + Traceback (most recent call last): + PTypeError: Invalid type for field BRecord.x, was float + + +Custom types (classes) that are iterable should be wrapped in a tuple to prevent their +members being added to the set of valid types. Although Enums in particular are now +supported without wrapping, see #83 for more information. + +Mandatory fields +**************** +Fields are not mandatory by default but can be specified as such. If fields are missing an +*InvariantException* will be thrown which contains information about the missing fields. + +.. code:: python + + >>> from pyrsistent import InvariantException + >>> class CRecord(PRecord): + ... x = field(mandatory=True) + ... + >>> r = CRecord(x=3) + >>> try: + ... r.discard('x') + ... except InvariantException as e: + ... print(e.missing_fields) + ... + ('CRecord.x',) + +Invariants +********** +It is possible to add invariants that must hold when evolving the record. Invariants can be +specified on both field and record level. If invariants fail an *InvariantException* will be +thrown which contains information about the failing invariants. An invariant function should +return a tuple consisting of a boolean that tells if the invariant holds or not and an object +describing the invariant. This object can later be used to identify which invariant that failed. + +The global invariant function is only executed if all field invariants hold. + +Global invariants are inherited to subclasses. + +.. code:: python + + >>> class RestrictedVector(PRecord): + ... __invariant__ = lambda r: (r.y >= r.x, 'x larger than y') + ... x = field(invariant=lambda x: (x > 0, 'x negative')) + ... y = field(invariant=lambda y: (y > 0, 'y negative')) + ... + >>> r = RestrictedVector(y=3, x=2) + >>> try: + ... r.set(x=-1, y=-2) + ... except InvariantException as e: + ... print(e.invariant_errors) + ... + ('y negative', 'x negative') + >>> try: + ... r.set(x=2, y=1) + ... except InvariantException as e: + ... print(e.invariant_errors) + ... + ('x larger than y',) + +Invariants may also contain multiple assertions. For those cases the invariant function should +return a tuple of invariant tuples as described above. This structure is reflected in the +invariant_errors attribute of the exception which will contain tuples with data from all failed +invariants. Eg: + +.. code:: python + + >>> class EvenX(PRecord): + ... x = field(invariant=lambda x: ((x > 0, 'x negative'), (x % 2 == 0, 'x odd'))) + ... + >>> try: + ... EvenX(x=-1) + ... except InvariantException as e: + ... print(e.invariant_errors) + ... + (('x negative', 'x odd'),) + + +Factories +********* +It's possible to specify factory functions for fields. The factory function receives whatever +is supplied as field value and the actual returned by the factory is assigned to the field +given that any type and invariant checks hold. +PRecords have a default factory specified as a static function on the class, create(). It takes +a *Mapping* as argument and returns an instance of the specific record. +If a record has fields of type PRecord the create() method of that record will +be called to create the "sub record" if no factory has explicitly been specified to override +this behaviour. + +.. code:: python + + >>> class DRecord(PRecord): + ... x = field(factory=int) + ... + >>> class ERecord(PRecord): + ... d = field(type=DRecord) + ... + >>> ERecord.create({'d': {'x': '1'}}) + ERecord(d=DRecord(x=1)) + +Collection fields +***************** +It is also possible to have fields with ``pyrsistent`` collections. + +.. code:: python + + >>> from pyrsistent import pset_field, pmap_field, pvector_field + >>> class MultiRecord(PRecord): + ... set_of_ints = pset_field(int) + ... map_int_to_str = pmap_field(int, str) + ... vector_of_strs = pvector_field(str) + ... + +Serialization +************* +PRecords support serialization back to dicts. Default serialization will take keys and values +"as is" and output them into a dict. It is possible to specify custom serialization functions +to take care of fields that require special treatment. + +.. code:: python + + >>> from datetime import date + >>> class Person(PRecord): + ... name = field(type=unicode) + ... birth_date = field(type=date, + ... serializer=lambda format, d: d.strftime(format['date'])) + ... + >>> john = Person(name=u'John', birth_date=date(1985, 10, 21)) + >>> john.serialize({'date': '%Y-%m-%d'}) + {'birth_date': '1985-10-21', 'name': u'John'} + + +.. _instar: https://github.com/boxed/instar/ + +.. _PClass: + +PClass +~~~~~~ +A PClass is a python class with a fixed set of specified fields. PClasses are declared as python classes inheriting +from PClass. It is defined the same way that PRecords are and behaves like a PRecord in all aspects except that it +is not a PMap and hence not a collection but rather a plain Python object. + +.. code:: python + + >>> from pyrsistent import PClass, field + >>> class AClass(PClass): + ... x = field() + ... + >>> a = AClass(x=3) + >>> a + AClass(x=3) + >>> a.x + 3 + + +Checked collections +~~~~~~~~~~~~~~~~~~~ +Checked collections currently come in three flavors: CheckedPVector, CheckedPMap and CheckedPSet. + +.. code:: python + + >>> from pyrsistent import CheckedPVector, CheckedPMap, CheckedPSet, thaw + >>> class Positives(CheckedPSet): + ... __type__ = (long, int) + ... __invariant__ = lambda n: (n >= 0, 'Negative') + ... + >>> class Lottery(PRecord): + ... name = field(type=str) + ... numbers = field(type=Positives, invariant=lambda p: (len(p) > 0, 'No numbers')) + ... + >>> class Lotteries(CheckedPVector): + ... __type__ = Lottery + ... + >>> class LotteriesByDate(CheckedPMap): + ... __key_type__ = date + ... __value_type__ = Lotteries + ... + >>> lotteries = LotteriesByDate.create({date(2015, 2, 15): [{'name': 'SuperLotto', 'numbers': {1, 2, 3}}, + ... {'name': 'MegaLotto', 'numbers': {4, 5, 6}}], + ... date(2015, 2, 16): [{'name': 'SuperLotto', 'numbers': {3, 2, 1}}, + ... {'name': 'MegaLotto', 'numbers': {6, 5, 4}}]}) + >>> lotteries + LotteriesByDate({datetime.date(2015, 2, 15): Lotteries([Lottery(numbers=Positives([1, 2, 3]), name='SuperLotto'), Lottery(numbers=Positives([4, 5, 6]), name='MegaLotto')]), datetime.date(2015, 2, 16): Lotteries([Lottery(numbers=Positives([1, 2, 3]), name='SuperLotto'), Lottery(numbers=Positives([4, 5, 6]), name='MegaLotto')])}) + + # The checked versions support all operations that the corresponding + # unchecked types do + >>> lottery_0215 = lotteries[date(2015, 2, 15)] + >>> lottery_0215.transform([0, 'name'], 'SuperDuperLotto') + Lotteries([Lottery(numbers=Positives([1, 2, 3]), name='SuperDuperLotto'), Lottery(numbers=Positives([4, 5, 6]), name='MegaLotto')]) + + # But also makes asserts that types and invariants hold + >>> lottery_0215.transform([0, 'name'], 999) + Traceback (most recent call last): + PTypeError: Invalid type for field Lottery.name, was int + + >>> lottery_0215.transform([0, 'numbers'], set()) + Traceback (most recent call last): + InvariantException: Field invariant failed + + # They can be converted back to python built ins with either thaw() + # or serialize() (which provides possibilities to customize serialization) + >>> thaw(lottery_0215) + [{'numbers': set([1, 2, 3]), 'name': 'SuperLotto'}, {'numbers': set([4, 5, 6]), 'name': 'MegaLotto'}] + >>> lottery_0215.serialize() + [{'numbers': set([1, 2, 3]), 'name': 'SuperLotto'}, {'numbers': set([4, 5, 6]), 'name': 'MegaLotto'}] + +.. _transformations: + +Transformations +~~~~~~~~~~~~~~~ +Transformations are inspired by the cool library instar_ for Clojure. They let you evolve PMaps and PVectors +with arbitrarily deep/complex nesting using simple syntax and flexible matching syntax. + +The first argument to transformation is the path that points out the value to transform. The +second is the transformation to perform. If the transformation is callable it will be applied +to the value(s) matching the path. The path may also contain callables. In that case they are +treated as matchers. If the matcher returns True for a specific key it is considered for transformation. + +.. code:: python + + # Basic examples + >>> from pyrsistent import inc, freeze, thaw, rex, ny, discard + >>> v1 = freeze([1, 2, 3, 4, 5]) + >>> v1.transform([2], inc) + pvector([1, 2, 4, 4, 5]) + >>> v1.transform([lambda ix: 0 < ix < 4], 8) + pvector([1, 8, 8, 8, 5]) + >>> v1.transform([lambda ix, v: ix == 0 or v == 5], 0) + pvector([0, 2, 3, 4, 0]) + + # The (a)ny matcher can be used to match anything + >>> v1.transform([ny], 8) + pvector([8, 8, 8, 8, 8]) + + # Regular expressions can be used for matching + >>> scores = freeze({'John': 12, 'Joseph': 34, 'Sara': 23}) + >>> scores.transform([rex('^Jo')], 0) + pmap({'Joseph': 0, 'Sara': 23, 'John': 0}) + + # Transformations can be done on arbitrarily deep structures + >>> news_paper = freeze({'articles': [{'author': 'Sara', 'content': 'A short article'}, + ... {'author': 'Steve', 'content': 'A slightly longer article'}], + ... 'weather': {'temperature': '11C', 'wind': '5m/s'}}) + >>> short_news = news_paper.transform(['articles', ny, 'content'], lambda c: c[:25] + '...' if len(c) > 25 else c) + >>> very_short_news = news_paper.transform(['articles', ny, 'content'], lambda c: c[:15] + '...' if len(c) > 15 else c) + >>> very_short_news.articles[0].content + 'A short article' + >>> very_short_news.articles[1].content + 'A slightly long...' + + # When nothing has been transformed the original data structure is kept + >>> short_news is news_paper + True + >>> very_short_news is news_paper + False + >>> very_short_news.articles[0] is news_paper.articles[0] + True + + # There is a special transformation that can be used to discard elements. Also + # multiple transformations can be applied in one call + >>> thaw(news_paper.transform(['weather'], discard, ['articles', ny, 'content'], discard)) + {'articles': [{'author': 'Sara'}, {'author': 'Steve'}]} + +Evolvers +~~~~~~~~ +PVector, PMap and PSet all have support for a concept dubbed *evolvers*. An evolver acts like a mutable +view of the underlying persistent data structure with "transaction like" semantics. No updates of the original +data structure is ever performed, it is still fully immutable. + +The evolvers have a very limited API by design to discourage excessive, and inappropriate, usage as that would +take us down the mutable road. In principle only basic mutation and element access functions are supported. +Check out the documentation_ of each data structure for specific examples. + +Examples of when you may want to use an evolver instead of working directly with the data structure include: + +* Multiple updates are done to the same data structure and the intermediate results are of no + interest. In this case using an evolver may be a more efficient and easier to work with. +* You need to pass a vector into a legacy function or a function that you have no control + over which performs in place mutations. In this case pass an evolver instance + instead and then create a new pvector from the evolver once the function returns. + +.. code:: python + + >>> from pyrsistent import v + + # In place mutation as when working with the built in counterpart + >>> v1 = v(1, 2, 3) + >>> e = v1.evolver() + >>> e[1] = 22 + >>> e = e.append(4) + >>> e = e.extend([5, 6]) + >>> e[5] += 1 + >>> len(e) + 6 + + # The evolver is considered *dirty* when it contains changes compared to the underlying vector + >>> e.is_dirty() + True + + # But the underlying pvector still remains untouched + >>> v1 + pvector([1, 2, 3]) + + # Once satisfied with the updates you can produce a new pvector containing the updates. + # The new pvector will share data with the original pvector in the same way that would have + # been done if only using operations on the pvector. + >>> v2 = e.persistent() + >>> v2 + pvector([1, 22, 3, 4, 5, 7]) + + # The evolver is now no longer considered *dirty* as it contains no differences compared to the + # pvector just produced. + >>> e.is_dirty() + False + + # You may continue to work with the same evolver without affecting the content of v2 + >>> e[0] = 11 + + # Or create a new evolver from v2. The two evolvers can be updated independently but will both + # share data with v2 where possible. + >>> e2 = v2.evolver() + >>> e2[0] = 1111 + >>> e.persistent() + pvector([11, 22, 3, 4, 5, 7]) + >>> e2.persistent() + pvector([1111, 22, 3, 4, 5, 7]) + +.. _freeze: +.. _thaw: + +freeze and thaw +~~~~~~~~~~~~~~~ +These functions are great when your cozy immutable world has to interact with the evil mutable world outside. + +.. code:: python + + >>> from pyrsistent import freeze, thaw, v, m + >>> freeze([1, {'a': 3}]) + pvector([1, pmap({'a': 3})]) + >>> thaw(v(1, m(a=3))) + [1, {'a': 3}] + +Compatibility +------------- + +Pyrsistent is developed and tested on Python 2.7, 3.5, 3.6, 3.7 and PyPy (Python 2 and 3 compatible). It will most +likely work on all other versions >= 3.4 but no guarantees are given. :) + +Compatibility issues +~~~~~~~~~~~~~~~~~~~~ + +.. _27: https://github.com/tobgu/pyrsistent/issues/27 + +There is currently one known compatibility issue when comparing built in sets and frozensets to PSets as discussed in 27_. +It affects python 2 versions < 2.7.8 and python 3 versions < 3.4.0 and is due to a bug described in +http://bugs.python.org/issue8743. + +Comparisons will fail or be incorrect when using the set/frozenset as left hand side of the comparison. As a workaround +you need to either upgrade Python to a more recent version, avoid comparing sets/frozensets with PSets or always make +sure to convert both sides of the comparison to the same type before performing the comparison. + +Performance +----------- + +Pyrsistent is developed with performance in mind. Still, while some operations are nearly on par with their built in, +mutable, counterparts in terms of speed, other operations are slower. In the cases where attempts at +optimizations have been done, speed has generally been valued over space. + +Pyrsistent comes with two API compatible flavors of PVector (on which PMap and PSet are based), one pure Python +implementation and one implemented as a C extension. The latter generally being 2 - 20 times faster than the former. +The C extension will be used automatically when possible. + +The pure python implementation is fully PyPy compatible. Running it under PyPy speeds operations up considerably if +the structures are used heavily (if JITed), for some cases the performance is almost on par with the built in counterparts. + +Type hints +---------- + +PEP 561 style type hints for use with mypy and various editors are available for most types and functions in pyrsistent. + +Type classes for annotating your own code with pyrsistent types are also available under pyrsistent.typing. + +Installation +------------ + +pip install pyrsistent + +Documentation +------------- + +Available at http://pyrsistent.readthedocs.org/ + +Brief presentation available at http://slides.com/tobiasgustafsson/immutability-and-python/ + +Contributors +------------ + +Tobias Gustafsson https://github.com/tobgu + +Christopher Armstrong https://github.com/radix + +Anders Hovmöller https://github.com/boxed + +Itamar Turner-Trauring https://github.com/itamarst + +Jonathan Lange https://github.com/jml + +Richard Futrell https://github.com/Futrell + +Jakob Hollenstein https://github.com/jkbjh + +David Honour https://github.com/foolswood + +David R. MacIver https://github.com/DRMacIver + +Marcus Ewert https://github.com/sarum90 + +Jean-Paul Calderone https://github.com/exarkun + +Douglas Treadwell https://github.com/douglas-treadwell + +Travis Parker https://github.com/teepark + +Julian Berman https://github.com/Julian + +Dennis Tomas https://github.com/dtomas + +Neil Vyas https://github.com/neilvyas + +doozr https://github.com/doozr + +Kamil Galuszka https://github.com/galuszkak + +Tsuyoshi Hombashi https://github.com/thombashi + +nattofriends https://github.com/nattofriends + +agberk https://github.com/agberk + +Waleed Khan https://github.com/arxanas + +Jean-Louis Fuchs https://github.com/ganwell + +Carlos Corbacho https://github.com/ccorbacho + +Felix Yan https://github.com/felixonmars + +benrg https://github.com/benrg + +Jere Lahelma https://github.com/je-l + +Max Taggart https://github.com/MaxTaggart + +Vincent Philippon https://github.com/vphilippon + +Semen Zhydenko https://github.com/ss18 + +Till Varoquaux https://github.com/till-varoquaux + +Michal Kowalik https://github.com/michalvi + +ossdev07 https://github.com/ossdev07 + +Kerry Olesen https://github.com/qhesz + +johnthagen https://github.com/johnthagen + +Contributing +------------ + +Want to contribute? That's great! If you experience problems please log them on GitHub. If you want to contribute code, +please fork the repository and submit a pull request. + +Run tests +~~~~~~~~~ +.. _tox: https://tox.readthedocs.io/en/latest/ + +Tests can be executed using tox_. + +Install tox: ``pip install tox`` + +Run test for Python 2.7: ``tox -epy27`` + +Release +~~~~~~~ +* Update CHANGES.txt +* Update README with any new contributors and potential info needed. +* Update _pyrsistent_version.py +* python setup.py sdist upload +* Commit and tag with new version: git add -u . && git commit -m 'Prepare version vX.Y.Z' && git tag -a vX.Y.Z -m 'vX.Y.Z' +* Push commit and tags: git push && git push --tags + +Project status +-------------- +Pyrsistent can be considered stable and mature (who knows, there may even be a 1.0 some day :-)). The project is +maintained, bugs fixed, PRs reviewed and merged and new releases made. I currently do not have time for development +of new features or functionality which I don't have use for myself. I'm more than happy to take PRs for new +functionality though! + +There are a bunch of issues marked with ``enhancement`` and ``help wanted`` that contain requests for new functionality +that would be nice to include. The level of difficulty and extend of the issues varies, please reach out to me if you're +interested in working on any of them. + +If you feel that you have a grand master plan for where you would like Pyrsistent to go and have the time to put into +it please don't hesitate to discuss this with me and submit PRs for it. If all goes well I'd be more than happy to add +additional maintainers to the project! |