Minimal r7rs scheme python library with a repl. Made by gpt, maintained by human.

Install

pip install pyscheme

Using git to install latest version

pip install git+https://github.com/dbian/pyscheme.git

Implemented Features

• Lexical scope let,let*. begin, if, lambda, define... etc.
• Full featured Macro system, which means you can use _ and ... in pattern matching rules.
• easy template interpolation support aka.: "`", "," and ",@"
• Use put to extend scheme language easily with power python ecosystem.
• Single line comment, start with ;
• REPL, with clojure like *1 *2 *3 result cache support
• More to discover...

Usage

import pyscheme
env = pyscheme.new_env()
assert pyscheme.run("(define bb (lambda (aa) (+ aa 2))) (bb 5)", env) == 7

def str_format_func(f, *args):
    return f % args
pyscheme.put("format", str_format_func)
pyscheme.put("variable", 123)

Future plans

• macros system add hygienic variable support
• more standard functions
• call/cc
• module system
• more