Why LisPy?¶

Just a new syntax for Python¶

LisPy is not a new language. It is just a new syntax for Python. You can just think in Python, write in LisPy. You'll experience less breaking changes. It also provides some pythonic syntax such as "list comprehensions".

Python Interop: 100% Compatible with Vanila Python¶

LisPy is 100% compatible with Python. You can use any Python libraries and modules in LisPy. You can also use LisPy modules in Python.

Interop example¶

Import numpy in LisPy¶

(import numpy as np)

Import LisPy Code in Python¶

When you have function bar in foo.lpy file

import lispy # it makes python interop available
from foo import bar
foo()

Macro system¶

LisPy has a Lisp-like macro system. This can be achieved by its s-expression-like syntax.

I recommend reading Paul Graham’s article Beating the Average, which illustrates why macro systems are valuable.

Macro example¶

do-while macro

; do-while macro example
(defmacro do-while [pred *body]
  (return `(do
             ~@body
             (while ~pred
               ~@body))))

(do-while False (print "Does it really happen?"))

Translated into Python:

print('Does it really happen?')
while False:
    print('Does it really happen?')

Structural editing¶

Check out the Structural Editing section in Clojure documentation.