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Beautify and modernize the SequenceMatcher example

This commit is contained in:
Raymond Hettinger 2011-04-09 19:41:31 -07:00
parent 4e6aba6f63 dbb677a894
commit 1929983518
1 changed files with 9 additions and 7 deletions
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16
Doc/library/difflib.rst
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@ -483,13 +483,15 @@ The :class:`SequenceMatcher` class has this constructor:
>>> b = "abycdf"
>>> s = SequenceMatcher(None, a, b)
>>> for tag, i1, i2, j1, j2 in s.get_opcodes():
... print(("%7s a[%d:%d] (%s) b[%d:%d] (%s)" %
... (tag, i1, i2, a[i1:i2], j1, j2, b[j1:j2])))
delete a[0:1] (q) b[0:0] ()
equal a[1:3] (ab) b[0:2] (ab)
replace a[3:4] (x) b[2:3] (y)
equal a[4:6] (cd) b[3:5] (cd)
insert a[6:6] () b[5:6] (f)
print('{:7} a[{}:{}] --> b[{}:{}] {!r:>8} --> {!r}'.format(
tag, i1, i2, j1, j2, a[i1:i2], b[j1:j2]))
delete a[0:1] --> b[0:0] 'q' --> ''
equal a[1:3] --> b[0:2] 'ab' --> 'ab'
replace a[3:4] --> b[2:3] 'x' --> 'y'
equal a[4:6] --> b[3:5] 'cd' --> 'cd'
insert a[6:6] --> b[5:6] '' --> 'f'
.. method:: get_grouped_opcodes(n=3)