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Python String Formatting: f-string Format Specs, Rounding Surprises, Percent Style and the 3.10 Quote Limits

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Self-Hosting & Infra beginner 5 min read $0.01 Updated 2026-10-20

Executed on Python 3.10: f"{2.675:.2f}", .0f on 0.5, 1.5 and 2.5, thousands separators, percent, zero padding, alignment, sign, general and exponent formats, = debug output, nested width specs, and SyntaxError for reused quotes and backslashes in expressions.

Format numbers, padding, percentages and hex correctly. See why 2.675 formats as 2.67, how .0f rounds halves, what the = specifier prints, and which f-string forms are syntax errors before Python 3.12.

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