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<div><span style="font-family: Consolas, Courier, monospace;">Hi all,</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;">I've just finished a language extension for CPython 3.6.x to support some additional grammars like Pattern Matching. And It's compatible with CPython.</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;">I'm looking for constructive advice, and I wonder if you will be interested in this one.</span></div>
<div><span style="font-family: Consolas, Courier, monospace;">（ the project address is </span><a href="https://github.com/thautwarm/flowpython" class="OWAAutoLink" id="LPlnk443622" previewremoved="true"><span style="font-family: Consolas, Courier, monospace;">https://github.com/thautwarm/flowpython</span></a><span style="font-family: Consolas, Courier, monospace;">)</span></div>
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<a id="LPUrlAnchor_15026572729230.4485725578851998" href="https://github.com/thautwarm/flowpython" target="_blank" style="text-decoration: none;">thautwarm/flowpython</a></div>
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github.com</div>
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flowpython - tasty feature extensions for python(python3).</div>
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<div><span style="font-family: Consolas, Courier, monospace;">Some examples here:</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"># where syntax</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> from math import pi</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> </span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> r = 1 # the radius</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> h = 10 # the height</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> S = (2*S_top + S_side) where:</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> S_top = pi*r**2</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> S_side = C * h where:</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> C = 2*pi*r</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"># lambda&curry :</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> lambda x: lambda y: lambda z: ret where:</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> ret = x+y</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> ret -= z</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> .x -> .y -> .z -> ret where:</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> ret = x+y</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> ret -= z</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> as-with x def as y def as z def ret where:</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> ret = x+y</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> ret -= z</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"># arrow transform (to avoid endless parentheses and try to be more readable.</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> >> range(5) -> map(.x->x+2, _) -> list(_)</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> >> [2,3,4,5,6]</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"># pattern matching</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"># use "condic" as keyword is for avoiding the conflictions against the standard libraries and packages from third party. "switch" and "match" both lead to conflictions. </span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> condic+(type) 1: </span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> case a:int => assert a == 1 and type(a) == 1</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> [>]</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> case 0 => assert 1 > 0</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> [is not]</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> case 1 => assert 1 is not 1</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> otherwise => print("nothing")</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> condic+() [1,2,3]:</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> case (a,*b)->b:list => sum(b)</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> +[]</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> case [] => print('empty list')</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> +[==]</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> case (a,b):(1,2) => print("the list is [1,2]")</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;">The grammars with more details and examples can be found in</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> https://github.com/thautwarm/flowpython/wiki</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;">Does it interest you? If so, you can try it if you have CPython 3.6.x.</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> pip install flowpython</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> python -m flowpython -m enable/disable </span></div>
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<div><span style="font-family: Consolas, Courier, monospace;">Here is an example to use flowpython, which gives the permutations of a sequence.</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> from copy import deepcopy</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> permutations = .seq -> seq_seq where:</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> condic+[] seq: </span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> case (a, ) => seq_seq = [a,] </span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> case (a, b) => seq_seq = [[a,b],[b,a]] </span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> case (a,*b) => </span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> seq_seq = permutations(b) -> map(.x -> insertAll(x, a), _) -> sum(_, []) where:</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> insertAll = . x, a -> ret where:</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> ret = [ deepcopy(x) -> _.insert(i, a) or _ for i in (len(x) -> range(_+1)) ]</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;">If the object permutations are defined, try these codes in console:</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> >> range(3) -> permutations(_)</span></div>
<div><span style="font-family: Consolas, Courier, monospace;"> >> [[0, 1, 2], [1, 0, 2], [1, 2, 0], [0, 2, 1], [2, 0, 1], [2, 1, 0]]</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;">Does it seem to be interesting?</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;">Thanks,</span></div>
<div><span style="font-family: Consolas, Courier, monospace;">Thautwarm</span></div>
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<div><span style="font-family: Consolas, Courier, monospace;"> </span></div>
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