Developer Builds Pure Python SQLite Parser in 800 Lines Using Only Standard Library

A developer replaced Python's sqlite3 C driver with an 800-line pure Python implementation using only the standard library, as part of a systems challenge that banned all third-party dependencies. The project, called SQRay, functions as a forensic-grade terminal B-Tree visualizer capable of mapping every byte of an SQLite database file directly in the console. To achieve this, the developer had to manually reconstruct SQLite's physical memory model, including parsing fixed-size page blocks, B-Tree structures, cell pointer arrays, and variable-length integers. Standard database drivers like sqlite3 abstract away low-level file details such as disk page locations, deleted row gaps, and uncheckpointed write-ahead log transactions, which made a custom binary parser necessary for deep inspection. The implementation relied solely on Python's built-in struct module, bitwise operators, and raw binary file streams to replicate functionality normally handled by 250,000 lines of optimized C code.