psf/black

List concatenation, multiple lines

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#260 创建于 2018年5月26日

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 (2 评论) (3 反应) (0 负责人)Python (41,258 star) (2,693 fork)batch import
F: linebreakF: symmetryT: enhancementT: stylehelp wanted

描述

Probably not a bug, but I was wondering if the code below shouldn't be formatted more like call chains are. I did not expect black to change anything other than quotes in this example. Aligned brackets feel much more readable.

# before
-    search_fields = (
-        ['file__%s' % field for field in FileAdmin.search_fields] +
-        ['resource__%s' % field for field in ResourceAdmin.search_fields]
-    )
# black output
+    search_fields = ["file__%s" % field for field in FileAdmin.search_fields] + [
+        "resource__%s" % field for field in ResourceAdmin.search_fields
+    ]

Operating system: OSX 10.11.6 Python version: 3.6.5 Black version: 18.5b0 Does also happen on master: yes

贡献者指南

技术栈
python
领域
tooling
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。
4
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1-2 days
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。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
Python 3.6+Familiarity with Black's codebase
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。
35
研究方向
This issue requests that list concatenation on multiple lines be formatted similarly to call chains. Investigate how Black currently handles binary expressions involving list comprehensions, particularly in the blib2to3 or lines module. Consider adjusting the split logic so that the + operator is placed at the beginning of the continuation line, aligning with the style used for chained calls. Test the provided example to ensure the output matches the proposed formatting.