JuliaLang/julia

Printf for complex numbers

Open

#58,617 创建于 2025年6月3日

在 GitHub 查看
 (4 评论) (0 反应) (0 负责人)Julia (48,709 star) (5,773 fork)batch import
complexdisplay and printingfeaturehelp wanted

描述

Currently, @sprintf "%.2f" (1+2im) errors, but it would make sense for it to produce "1.00 + 2.00im" I think. Currently, printfing a complex number is not really convenient, requiring a manual split into real + complex, and keeping the format string in sync between them.

贡献者指南

技术栈
无
领域
backend
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
fresh
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
Familiarity with Julia's printf implementation
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
60
研究方向
The issue requests that complex numbers be supported in printf format strings, e.g., @sprintf "%.2f" (1+2im) should produce "1.00 + 2.00im". Start by examining the current printf implementation in Julia's source, likely in base/printf.jl or similar. Understand how real numbers are formatted and how the Complex type's show method works (in base/complex.jl). There are no linked PRs, so a new implementation would need to extend the printf machinery to handle complex numbers, possibly by formatting real and imaginary parts separately and inserting a sign. Tests would need to be added in test/printf.jl.
Printf for complex numbers · JuliaLang/julia#58617 | Good First Issue