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gh-95953: Add a css class to changed lines of difflib.HtmlDiff make_table #139226

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Merged
hugovk merged 5 commits into from
Sep 22, 2025
Merged

gh-95953: Add a css class to changed lines of difflib.HtmlDiff make_table #139226

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9037f26
gh-95953: add a css class to changed lines of difflib.HtmlDiff make_t…
KatieLG Sep 22, 2025
5a7c3ca
gh-95953: use an f-string for difflib _format_line and update news
KatieLG Sep 22, 2025
8f58a05
Merge branch 'main' into gh-95953-difflib-css-class
KatieLG Sep 22, 2025
812ff5a
gh-95953: linting fix
KatieLG Sep 22, 2025
2ff9b07
gh-95953: add to ACKS
KatieLG Sep 22, 2025
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7 changes: 5 additions & 2 deletions Lib/difflib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1924,8 +1924,11 @@ def _format_line(self,side,flag,linenum,text):
# make space non-breakable so they don't get compressed or line wrapped
text = text.replace(' ',' ').rstrip()

return '<td class="diff_header"%s>%s</td><td nowrap="nowrap">%s</td>' \
% (id,linenum,text)
# add a class to the td tag if there is a difference on the line
css_class = ' class="diff_changed" ' if flag else ' '

return f'<td class="diff_header"{id}>{linenum}</td>' \
+ f'<td{css_class}nowrap="nowrap">{text}</td>'

def _make_prefix(self):
"""Create unique anchor prefixes"""
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