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<title>4.4.4 Differ Example
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<H2><A NAME=
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This example compares two texts. First we set up the texts, sequences
of individual single-line strings ending with newlines (such sequences
can also be obtained from the
<tt class=
"method">readlines()
</tt> method of file-like
<div class=
"verbatim"><pre>
>>> text1 = '''
1. Beautiful is better than ugly.
...
2. Explicit is better than implicit.
...
3. Simple is better than complex.
...
4. Complex is better than complicated.
>>> text1[
0][-
1]
>>> text2 = '''
1. Beautiful is better than ugly.
...
3. Simple is better than complex.
...
4. Complicated is better than complex.
...
5. Flat is better than nested.
Next we instantiate a Differ object:
<div class=
"verbatim"><pre>
>>> d = Differ()
Note that when instantiating a
<tt class=
"class">Differ
</tt> object we may pass
functions to filter out line and character ``junk.'' See the
<tt class=
"method">Differ()
</tt> constructor for details.
Finally, we compare the two:
<div class=
"verbatim"><pre>
>>> result = list(d.compare(text1, text2))
<code>result
</code> is a list of strings, so let's pretty-print it:
<div class=
"verbatim"><pre>
>>> from pprint import pprint
>>> pprint(result)
['
1. Beautiful is better than ugly.\n',
'-
2. Explicit is better than implicit.\n',
'-
3. Simple is better than complex.\n',
'+
3. Simple is better than complex.\n',
'-
4. Complex is better than complicated.\n',
'+
4. Complicated is better than complex.\n',
'+
5. Flat is better than nested.\n']
As a single multi-line string it looks like this:
<div class=
"verbatim"><pre>
>>> sys.stdout.writelines(result)
1. Beautiful is better than ugly.
-
2. Explicit is better than implicit.
-
3. Simple is better than complex.
+
3. Simple is better than complex.
-
4. Complex is better than complicated.
+
4. Complicated is better than complex.
+
5. Flat is better than nested.
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<span class=
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