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54 | <H2><A NAME="SECTION006440000000000000000"></A><A NAME="differ-examples"></A> | |
55 | <BR> | |
56 | 4.4.4 Differ Example | |
57 | </H2> | |
58 | ||
59 | <P> | |
60 | This example compares two texts. First we set up the texts, sequences | |
61 | of individual single-line strings ending with newlines (such sequences | |
62 | can also be obtained from the <tt class="method">readlines()</tt> method of file-like | |
63 | objects): | |
64 | ||
65 | <P> | |
66 | <div class="verbatim"><pre> | |
67 | >>> text1 = ''' 1. Beautiful is better than ugly. | |
68 | ... 2. Explicit is better than implicit. | |
69 | ... 3. Simple is better than complex. | |
70 | ... 4. Complex is better than complicated. | |
71 | ... '''.splitlines(1) | |
72 | >>> len(text1) | |
73 | 4 | |
74 | >>> text1[0][-1] | |
75 | '\n' | |
76 | >>> text2 = ''' 1. Beautiful is better than ugly. | |
77 | ... 3. Simple is better than complex. | |
78 | ... 4. Complicated is better than complex. | |
79 | ... 5. Flat is better than nested. | |
80 | ... '''.splitlines(1) | |
81 | </pre></div> | |
82 | ||
83 | <P> | |
84 | Next we instantiate a Differ object: | |
85 | ||
86 | <P> | |
87 | <div class="verbatim"><pre> | |
88 | >>> d = Differ() | |
89 | </pre></div> | |
90 | ||
91 | <P> | |
92 | Note that when instantiating a <tt class="class">Differ</tt> object we may pass | |
93 | functions to filter out line and character ``junk.'' See the | |
94 | <tt class="method">Differ()</tt> constructor for details. | |
95 | ||
96 | <P> | |
97 | Finally, we compare the two: | |
98 | ||
99 | <P> | |
100 | <div class="verbatim"><pre> | |
101 | >>> result = list(d.compare(text1, text2)) | |
102 | </pre></div> | |
103 | ||
104 | <P> | |
105 | <code>result</code> is a list of strings, so let's pretty-print it: | |
106 | ||
107 | <P> | |
108 | <div class="verbatim"><pre> | |
109 | >>> from pprint import pprint | |
110 | >>> pprint(result) | |
111 | [' 1. Beautiful is better than ugly.\n', | |
112 | '- 2. Explicit is better than implicit.\n', | |
113 | '- 3. Simple is better than complex.\n', | |
114 | '+ 3. Simple is better than complex.\n', | |
115 | '? ++ \n', | |
116 | '- 4. Complex is better than complicated.\n', | |
117 | '? ^ ---- ^ \n', | |
118 | '+ 4. Complicated is better than complex.\n', | |
119 | '? ++++ ^ ^ \n', | |
120 | '+ 5. Flat is better than nested.\n'] | |
121 | </pre></div> | |
122 | ||
123 | <P> | |
124 | As a single multi-line string it looks like this: | |
125 | ||
126 | <P> | |
127 | <div class="verbatim"><pre> | |
128 | >>> import sys | |
129 | >>> sys.stdout.writelines(result) | |
130 | 1. Beautiful is better than ugly. | |
131 | - 2. Explicit is better than implicit. | |
132 | - 3. Simple is better than complex. | |
133 | + 3. Simple is better than complex. | |
134 | ? ++ | |
135 | - 4. Complex is better than complicated. | |
136 | ? ^ ---- ^ | |
137 | + 4. Complicated is better than complex. | |
138 | ? ++++ ^ ^ | |
139 | + 5. Flat is better than nested. | |
140 | </pre></div> | |
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