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        "author": "Jaden Geller",
        "author_email": "UNKNOWN",
        "bugtrack_url": null,
        "classifiers": [
            "Intended Audience :: Developers",
            "Intended Audience :: Education",
            "License :: OSI Approved :: MIT License",
            "Programming Language :: Python :: 3 :: Only",
            "Programming Language :: Python :: Implementation :: PyPy",
            "Topic :: Software Development :: Libraries"
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        "description": "Monadic Do-Notation\r\n-------------------\r\n\r\nGuac provides monadic do-notation, inspired by Haskell, in Python. Monads provide \"programmable semicolons\" by which the behavior of programs can be changed. A common, useful monad is the list monad, which represents non-deterministic computations. The list monad makes it very easy to write backtracking searches.\r\n\r\nRequirements\r\n-------------\r\n\r\nGuac requires an implementation of Python 3 that supports ``copy.deepcopy`` on generator functions. The most common distribution, CPython, is lacking this feature, but pypy implements it!\r\n\r\nExample\r\n--------\r\n\r\nHere's an example that computes all the possible ways you can give $0.47 change with pennies, nickels, dimes, and quarters:\r\n\r\n.. code:: python\r\n\r\n   from guac import *\r\n   \r\n   @monadic(ListMonad)\r\n   def make_change(amount_still_owed, possible_coins):\r\n       change = []\r\n       \r\n       # Keep adding coins while we owe them money and there are still coins.\r\n       while amount_still_owed > 0 and possible_coins:\r\n       \r\n           # \"Nondeterministically\" choose whether to give anther coin of this value.\r\n           # Aka, try both branches, and return both results.\r\n           give_min_coin = yield [True, False]\r\n           \r\n           if give_min_coin:\r\n               # Give coin\r\n               min_coin = possible_coins[0]\r\n               change.append(min_coin)\r\n               amount_still_owed -= min_coin\r\n           else:\r\n               # Never give this coin value again (in this branch!)\r\n               del possible_coins[0]\r\n               \r\n       # Did we charge them the right amount?\r\n       yield guard(amount_still_owed == 0)\r\n       \r\n       # Lift the result back into the monad.\r\n       yield lift(change)\r\n       \r\n   print(make_change(27, [1, 5, 10, 25]))\r\n\r\nRunning this program will print a list of lists, each list containing a different set of numbers that add up to 27. You can imagine lots of cool ways this could be used, from unification to parsing!\r\n\r\nTo learn more, check out the README.",
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        "keywords": "monad,monadic,coroutine,generator,pypy,backtracking",
        "license": "MIT",
        "maintainer": "",
        "maintainer_email": "",
        "name": "guac",
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        "summary": "Hakell-inspired monadic do-notation in Python",
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