PEP 498: The Monologue
summary
PEP 498 adds a one-letter prefix that lets literal strings include Python expressions in braces so you write f-strings or formatted string literals instead of %-formatting or str.format; implementation lands in Python 3.6 and shows measurable speed gains over % and format in simple tests. It supports format specifiers, method calls inside expressions, raw f-strings (no escape processing), disallows byte/Unicode prefix combos, and ships successfully after quick community review.
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