projects / OpenSPARC-T2-SAM / blame
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| 54 | <H2><A NAME="SECTION0052820000000000000000"></A><A NAME="subclassing-reprs"></A> | |
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| 56 | 3.28.2 Subclassing Repr Objects | |
| 57 | </H2> | |
| 58 | ||
| 59 | <P> | |
| 60 | The use of dynamic dispatching by <tt class="method">Repr.repr1()</tt> allows | |
| 61 | subclasses of <tt class="class">Repr</tt> to add support for additional built-in | |
| 62 | object types or to modify the handling of types already supported. | |
| 63 | This example shows how special support for file objects could be | |
| 64 | added: | |
| 65 | ||
| 66 | <P> | |
| 67 | <div class="verbatim"><pre> | |
| 68 | import repr | |
| 69 | import sys | |
| 70 | ||
| 71 | class MyRepr(repr.Repr): | |
| 72 | def repr_file(self, obj, level): | |
| 73 | if obj.name in ['<stdin>', '<stdout>', '<stderr>']: | |
| 74 | return obj.name | |
| 75 | else: | |
| 76 | return `obj` | |
| 77 | ||
| 78 | aRepr = MyRepr() | |
| 79 | print aRepr.repr(sys.stdin) # prints '<stdin>' | |
| 80 | </pre></div> | |
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