Developer creates a Python interpreter in 1024 bytes of C code

Project Goal and Constraints

A developer undertook the challenge of creating a Python interpreter using only 1024 bytes of C code. The project specifically avoided macros and external libraries, focusing on a minimal implementation that could execute Python-like syntax.

The primary goal was to fit enough Python features to run a FizzBuzz program, which includes `def`, colons, indentation, and `if` statements without parentheses. This required a significant reduction from the full Python language specification.

Implementation Approach

The interpreter's design deviates from the typical CPython architecture, which involves tokenization, AST parsing, optimization, and bytecode interpretation. Instead, this compact version uses a simpler, direct execution model.

State management relies on a few global variables, including a `char src[999]` array for the program code, an `int vars[256]` array for the symbol table, and variables to track the current position and character in the source code.

Parsing and Execution

Expressions are handled using a recursive descent parser, with execution occurring during the parsing process. An example provided shows `parse_sum` handling addition and subtraction directly.

The implementation currently lacks error handling, making assumptions about the correctness of the input Python code to maintain its small footprint.