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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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