OpenPulse Python AST Reference

OpenPulse (version 1.0.1) is a Python library providing a reference Abstract Syntax Tree (AST) for the OpenPulse grammar. It enables the representation and manipulation of pulse-level definitions (`cal` and `defcal` blocks) within the OpenQASM 3 ecosystem, reusing classical types and statements from the `openqasm3` library. The library includes AST nodes and a parser, serving as a foundational component for tools that process pulse-level control in quantum computing.