Embedded Database Engine Written in Python
github.com
github.com
It's 44 lines of Python code.
An "insert" is implemented by loading the whole "database", in json format, into memory, adding an element and writing the whole thing back to a file.
It's not a database, it's 30 min coding exercise by a Python beginner.
Also, inexcusable self-promotion by max0563 (this is his 7th submission of a toy python program of his, with grandiose names like "NoSQL database engine in Python" or "Dropbox clone in Python" but whose implementation boils down to few lines of code).