From 68ba9a685d2627efb8ffdb54296e9b9892924cc9 Mon Sep 17 00:00:00 2001
From: Edward Loper <edloper@gradient.cis.upenn.edu>
Date: Thu, 12 Aug 2004 02:43:49 +0000
Subject: In output_difference(), replace blank lines in `want` with
 <BLANKLINE> (rather than replacing <BLANKLINE> with blank lines in `got`). 
 This makes it easier to see what's intended.

---
 Lib/doctest.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Lib/doctest.py b/Lib/doctest.py
index 9b91277..a98df1a 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -1492,10 +1492,10 @@ class OutputChecker:
         compare `want` and `got`.  `indent` is the indentation of the
         original example.
         """
-        # If <BLANKLINE>s are being used, then replace <BLANKLINE>
-        # with blank lines in the expected output string.
+        # If <BLANKLINE>s are being used, then replace blank lines
+        # with <BLANKLINE> in the actual output string.
         if not (optionflags & DONT_ACCEPT_BLANKLINE):
-            want = re.sub('(?m)^%s$' % re.escape(BLANKLINE_MARKER), '', want)
+            got = re.sub('(?m)^[ ]*(?=\n)', BLANKLINE_MARKER, got)
 
         # Check if we should use diff.  Don't use diff if the actual
         # or expected outputs are too short, or if the expected output
-- 
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