pyj

Write Python like JavaScript: blocks in { }, statements separated by ; or newlines, and no significant whitespace.

def fib(n) { a, b = 0, 1; for _ in range(n) { a, b = b, a + b }; return a }

if n < 0 { print("negative") } else if n == 0 { print("zero") }
    else { print("positive") }

config = {"name": "pyj", "tags": {"a", "b"}}   # dicts and sets work as usual

Features

• Transparent execution: once installed, python app.pyj just works, any program can import a .pyj module, and .py and .pyj files can be mixed freely.
• Errors point to your source: tracebacks, syntax errors and inspect.getsource show the exact .pyj line and column.
• Dicts and sets work as usual: a { opens a block only at the end of a statement header.
• Shell one-liners: pyj -c 'for i in range(3) { print(i) }', or pipe code into pyj.
• Single file, zero dependencies: installs itself without pip or root.
• Cross-platform: Python 3.10+, tested on Linux, macOS and Windows.

Install

pip install pybrace

On Debian, Ubuntu and other systems where pip is restricted, no pip or sudo is needed:

curl -O https://raw.githubusercontent.com/yyszh01/pyj/main/pyj.py
python3 pyj.py install
rm pyj.py

Errors point back to the source

  File "util.pyj", line 1, in divide
    def divide(a, b) { return a /
                              ~~^
        b }
        ~
ZeroDivisionError: division by zero

While converting, pyj records where each token came from. It parses the generated code with ast.parse, rewrites every AST node's position back to the source position, and then compiles.

Full documentation, syntax rules and a comparison with similar projects are in the README.