Python's creator Guido van Rossum announced on 11 November 2026, in a post titled "In Memoriam: Tim Peters 1952–2026" on discuss.python.org, that Tim Peters died earlier this year, on 15 July. LWN called it "sad (and somewhat delayed)" news. The post gives no other details about his death.
"It's hard to overestimate Tim's influence on Python," van Rossum wrote. Peters is probably best known for writing the Zen of Python (PEP 20). But van Rossum calls him "a mentor and language co-designer long before that": his first contribution was convincing van Rossum that Python should support mixed arithmetic between int and float.
In 2002 Peters gave Python Timsort, the sorting algorithm he designed for Python lists, which van Rossum notes was later adopted by Java and Android. Core developer Neil Schemenauer also credits him with polishing pymalloc, optimising the dict implementation and writing the first version of doctest.
Van Rossum wrote that Peters "really set the tone for early core development, never outright dismissing people"; other core developers and long-time community members added their memories in the thread. The news reached 527 points on Hacker News.
