Coconut v3! See Coconut's documentation for more information on all of the features listed below.

Note that v3 is a major version release that comes with some breaking changes, though Coconut will do its best to warn you if your code does anything that changed from v2 to v3.

Breaking changes:

• Improve set matching #714: set patterns now work like dict patterns where they allow extra keys, such that {1, 2} will match {1, 2, 3}. To get back the strict behavior, use the {1, 2, 3, *()} pattern. Coconut will warn you if your code contains set patterns without an explicit strictness marker.
• Add syntax for implicit coefficients #707: the precedence of implicit function application has been changed to be compatible with implicit coefficients, such that f x**2 is now equivalent to f(x**2) rather than f(x)**2. Coconut will warn you if your code contains expressions with new precedence.
• Make .$[] only use __iter_getitem__, not __getitem__ #733: .$[] will now only default to using an existing __getitem__ if the object is registered as a collections.abc.Sequence. __iter_getitem__ will still always be used. Lets you do things like {"k": "v"}$[0].
• Remove implicit getattr partials #730: obj. syntax as a shorthand for getattr$(obj) deprecated.
• Make --jobs default to sys rather than 0 #732: --jobs now defaults to sys rather than 0.

New features:

• Add syntax for implicit coefficients #707: New implicit coefficient syntax! Polynomials are just a x**2 + b x + c, with support for single variable names and numeric constants as coefficients.
• Add a way to define functions with copying closures #731: New copyclosure def functions that copy their closures on function creation, allowing them to e.g. hold on to loop variables.
• Make typing functions using protocols more ergonomic #709: (+) syntax in a typing context now yields a typing.Protocol that requires supporting that operator.
• Make typing functions using protocols more ergonomic #709: New &: operator for combining multiple typing.Protocol's into a single protocol.
• addpattern def with no prior match def #718 (thanks @yggdr!): You can now use addpattern def even if there's no existing function of that name, allowing you to use addpattern def for every pattern rather than having to use match def for the first one.
• Allow pipe into await #727: New x |> await syntax for using await in pipes.
• Improve pandas support #734: Substantially improved pandas support.
• Improve set matching #714: New frozenset and multiset patterns.

Bugfixes:

• Miscompilation of in operator in pattern matching code #725 (thanks @yggdr!): Fixed (in) operator function argument ordering.
• Operator functions incompatible with multi-word operators #721 (thanks @yggdr!): is not and not in operator functions now supported.
• coconut makes .xonshrc take an unreasonable amount of time to load #724 (thanks @Starwort!): Coconut no longer slows down xonsh loading and fixed xontrib unload coconut.
• Cannot access hidden directories on linux in xonsh #726 (thanks @caedmon-kitty!): Fixed certain xonsh commands when using Coconut's xonsh plugin.
• Properly universalize dictionaries on Python 2 #723: dict now always functions as on the latest Python 3 on any Python version.
• Calls to super inside pattern-matching classmethods do not work #728 (thanks @yggdr!): Fixed super compatibility across Python versions and some cases where super() wouldn't work.
• coconut --jupyter qtconsole runs python kernel rather than coconut kernel. #717 (thanks @kksgandhi!): Fixed coconut --jupyter qtconsole.