ANN: MacroPy: quasiquotes, case classes, LINQ and more! Now available on PyPI
Hey All, MacroPy is an implementation of Macros in Python which lets you very easily modify the semantics of a python program. Apart from the implementation of macros themselves, we also have a pretty impressive list of feature demos that were implemented on top of macros: - Quasiquotes, a quick way to manipulate fragments of a program - String Interpolation, a common feature in many languages - Pyxl, integrating XML markup into a Python program - Tracing and Smart Asserts - Case Classes, easy Algebraic Data Types from Scala - Pattern Matching from the Functional Programming world - LINQ to SQL from C# - Quick Lambdas from Scala and Groovy, - Parser Combinators, inspired by Scala's. The full documentation is over on github (https://github.com/lihaoyi/macropy) if anyone wants to check it out. It runs fine on both CPython 2.7 and PyPy 1.9, and I've just pushed the last up-to-date version of MacroPy to PyPI: https://pypi.python.org/pypi/MacroPy Hope someone finds this useful! Thanks! -Haoyi -- http://mail.python.org/mailman/listinfo/python-list
ANN: MacroPy: bringing Macros to Python
MacroPy is a pure-python library that allows user-defined AST rewrites as part of the import process (using PEP 302). In short, it makes mucking around with Python's semantics so easy as to be almost trivial: you write a function that takes an AST and returns an AST, register it as a macro, and you're off to the races. To give a sense of it, I just finished implementing Scala/Groovy style anonymous lambdas: map(f%(_ + 1), [1, 2, 3]) #[2, 3, 4] reduce(f%(_ + _), [1, 2, 3]) #6 ...which took about half an hour and 30 lines of code, start to finish. We're currently working on implementing destructuring-pattern-matching on objects (i.e. like in Haskell/Scala) and a clone of .NET's LINQ to SQL. It's still very much a work in progress, but we have a list of pretty cool macros already done, which shows off what you can do with it. If anyone else was thinking about messing around with the semantics of the Python language but was too scared to jump into the CPython internals, this offers a somewhat easier path. Thanks! -Haoyi -- http://mail.python.org/mailman/listinfo/python-list
