ABC programming language - “A programming language created by Leo Geurts, Lambert Meertens, and Steven Pemberton. Guido van Rossum, who developed Python, worked as a programmer implementing the ABC environment in the 1980s. Block structuring by indentation, built-in tuples and dictionaries, tuple unpacking, the semantics of the for loop, and uniform handling of all sequence types are some of the distinctive characteristics of Python that came from the ABC language.” (FlntPy 2022)