New submission from Chris Danis <cda...@wikimedia.org>:
When difflib.unified_diff is asked to produce a diff of inputs a.txt and b.txt
(attached), with 10 context lines, it produces the following:
--- codfw/groupLoadsBySection live
+++ codfw/groupLoadsBySection generated
@@ -90,37 +90,31 @@
},
"s4": {
"api": {
"db2106": 300,
"db2110": 100
},
"contributions": {
"db2084:3314": 100,
"db2091:3314": 100
},
- "dump": {
- "db2073": 100
- },
- "logpager": {
- "db2084:3314": 100,
- "db2091:3314": 100
- },
- "recentchanges": {
- "db2084:3314": 100,
- "db2091:3314": 100
- },
- "recentchangeslinked": {
- "db2084:3314": 100,
- "db2091:3314": 100
- },
- "vslow": {
- "db2073": 100
+ "logpager": {
+ "db2084:3314": 100,
+ "db2091:3314": 100
+ },
+ "recentchanges": {
+ "db2084:3314": 100,
+ "db2091:3314": 100
+ },
+ "recentchangeslinked": {
+ "db2084:3314": 100,
+ "db2091:3314": 100
},
"watchlist": {
"db2084:3314": 100,
"db2091:3314": 100
}
},
"s5": {
"api": {
"db2075": 300,
"db2128": 100
However, this could simply and much more readably be rendered as:
@@ -90,38 +90,32 @@
},
"s4": {
"api": {
"db2106": 3,
"db2110": 1
},
"contributions": {
"db2084:3314": 1,
"db2091:3314": 1
},
- "dump": {
- "db2073": 1
- },
"logpager": {
"db2084:3314": 1,
"db2091:3314": 1
},
"recentchanges": {
"db2084:3314": 1,
"db2091:3314": 1
},
"recentchangeslinked": {
"db2084:3314": 1,
"db2091:3314": 1
},
- "vslow": {
- "db2073": 1
- },
"watchlist": {
"db2084:3314": 1,
"db2091:3314": 1
}
},
"s5": {
"api": {
"db2059": 1,
"db2066": 1
},
(This is what diff -u10 produces.)
----------
components: Library (Lib)
files: a.txt
messages: 369390
nosy: cdanis
priority: normal
severity: normal
status: open
title: misleading output from difflib unified_diff
versions: Python 3.7
Added file: https://bugs.python.org/file49171/a.txt
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<https://bugs.python.org/issue40691>
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