Hylang - A Python powered Lisp AND a Lisp powered Python

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( Chennaipy Feb 2015

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Hy!

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Shrayas Logic Soft

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A Lisp powered Python

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A Python powered Lisp

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Lisp

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Lisp?

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John McCarthy 1958

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Polish Notation

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1+1

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INFIX 1+1

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+ 1 1

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+ 1 1 POLISH

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(+ 1 1)

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(+ 1 1) S-EXPRESSIONS

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(+ 1 1) S-EXPRESSIONS Function

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(+ 1 1) S-EXPRESSIONS Arguments

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Variable Arity!

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1 + 2 + 3 + 4 + 5 Inﬁx

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(+ 1 2 3 4 5) 1 + 2 + 3 + 4 + 5 Inﬁx S-Expressions

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Dialects

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Dialects Arc, AutoLISP, Clojure, Common Lisp, Emacs Lisp, EuLisp, Franz Lisp, Interlisp, ISLISP, LeLisp, LFE, Maclisp, MDL, Newlisp, NIL, Picolisp, Portable Standard Lisp, Racket, Scheme, SKILL, Spice Lisp, T, XLISP, Zetalisp

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No content

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hylang.org @paultag et al.

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Getting & Running $ pip install hy $ hy

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Lisp

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Lisp in Python

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Why?

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Pythonic Lisp 1

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Absurd Powers!!!!1 2

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Learn Lisp 3

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SICP

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Great Py Interop 4

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Code!

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def say_hello(name): print "Hello", name if __name__ == "__main__": say_hello("Python") python Hello, python

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def say_hello(name): print "Hello", name if __name__ == "__main__": say_hello("Python") (defn say_hello [name] (print "Hello" name)) (if (= __name__ "__main__") (say_hello "python")) python hylang Hello, python

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python Data Structures >>> [1,2,3] >>> {"foo": 1, "bar": 2, "baz": 3} >>> (1,2,3)

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python hylang Data Structures >>> [1,2,3] >>> {"foo": 1, "bar": 2, "baz": 3} >>> (1,2,3) => [1 2 3] => {"foo" 1 "bar" 2 "baz" 3} => (, 1 2 3)

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python Fn on Objects >>> "Hello World".upper() ”HELLO WORLD"

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python hylang Fn on Objects >>> "Hello World".upper() ”HELLO WORLD" ⇒ (.upper "Hello world") "HELLO WORLD"

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python Conditionals if (foo > 5): print "foo more than 5!" else: print "foo less than 5!"

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python hylang Conditionals if (foo > 5): print "foo more than 5!" else: print "foo less than 5!" (if (> foo 5) (print "foo more than 5!") (print "foo less than 5!"))

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python Conditionals (more) if (foo > 7): print "Too much" elif (foo < 7): print "Too less" else: print "ok :)"

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hylang Conditionals (more) (cond [(> foo 7) (print "Too much")] [(< foo 7) (print "Too less")] [true (print "ok :)")])

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python Loops for i in xrange(10): print i

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python hylang Loops for i in xrange(10): print i (for [i (xrange 10)] (print i))

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hylang Hy import Py (import os) (if (not (os.path.isdir "/foo/bar")) (os.mkdir "/foo/bar"))

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hylang (hymath.hy) Interop! (defn square [x] "returns square of x" (* x x))

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python (usemath.py) hylang (hymath.hy) Interop! (defn square [x] "returns square of x" (* x x)) import hy import hymath print hymath.square(8)

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Recap

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hylang is a pythonic lisp 1 Recap

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hylang is a pythonic lisp 1 Has great interop with python 2 Recap

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hylang is a pythonic lisp 1 Has great interop with python 2 Great excuse to learn Lisp 3 Recap

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hylang is a pythonic lisp 1 Has great interop with python 2 Great excuse to learn Lisp 3 A new language 4 Recap

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Fin @shrayasr