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It took place three times actually; Ping proposed string interpolation in 2000 in PEP 215 https://www.python.org/dev/peps/pep-0215/ and it was rejected, or rather simplified by Barry Warsaw in 2002 in PEP 292, which was actually implemented: https://www.python.org/dev/peps/pep-0292/ and remains in modern Python. Barry's optimism that this would satisfy the demand for template strings was of course foolish, but it met with Guido's misguided approval at the time. Fifteen years later, it was proposed a third time as PEP 498 and finally got in in a sane form: https://www.python.org/dev/peps/pep-0498/

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