Gabriel Genellina <gagsl-...@yahoo.com.ar> added the comment:
You (as a human) most likely parse these lines:
hostname vaijain123
hostname CAVANC1001CR1
as "two words, the first one is the same, the second word changed".
But difflib sees them more or less as: "21 letters, 8 of them are the
same, 13 are different". There are many more differences than matches,
so it makes sense to show the changes as a complete replacement:
>>> d = difflib.ndiff(["hostname vaijain123\n"], ["hostname
CAVANC1001CR1\n"])
>>> print ''.join(d)
- hostname vaijain123
+ hostname CAVANC1001CR1
It has nothing to do with upper or lower case letters ("A" and "a" are
completely different things for difflib). If the names were shorter, it
might consider a match:
>>> d = difflib.ndiff(["hostname vai\n"], ["hostname CAV\n"])
>>> print ''.join(d)
- hostname vai
? ^^^
+ hostname CAV
? ^^^
Note how the ratio changes:
>>> difflib.SequenceMatcher(None, "hostname vaijain123", "hostname
CAVANC1001CR1").ratio()
0.48780487804878048
>>> difflib.SequenceMatcher(None, "hostname vai", "hostname CAV").ratio
()
0.75
The ratio must be 0.75 or higher for a differ to consider two lines
"close enough" to show intra-line differences.
----------
nosy: +gagenellina
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue4889>
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