projects / OpenSPARC-T2-SAM / blame
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| 54 | <H2><A NAME="SECTION0052110000000000000000"></A> | |
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| 56 | <BR> | |
| 57 | 3.21.1 Examples | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | The following function emulates what was the standard import statement | |
| 62 | up to Python 1.4 (no hierarchical module names). (This | |
| 63 | <em>implementation</em> wouldn't work in that version, since | |
| 64 | <tt class="function">find_module()</tt> has been extended and | |
| 65 | <tt class="function">load_module()</tt> has been added in 1.4.) | |
| 66 | ||
| 67 | <P> | |
| 68 | <div class="verbatim"><pre> | |
| 69 | import imp | |
| 70 | import sys | |
| 71 | ||
| 72 | def __import__(name, globals=None, locals=None, fromlist=None): | |
| 73 | # Fast path: see if the module has already been imported. | |
| 74 | try: | |
| 75 | return sys.modules[name] | |
| 76 | except KeyError: | |
| 77 | pass | |
| 78 | ||
| 79 | # If any of the following calls raises an exception, | |
| 80 | # there's a problem we can't handle -- let the caller handle it. | |
| 81 | ||
| 82 | fp, pathname, description = imp.find_module(name) | |
| 83 | ||
| 84 | try: | |
| 85 | return imp.load_module(name, fp, pathname, description) | |
| 86 | finally: | |
| 87 | # Since we may exit via an exception, close fp explicitly. | |
| 88 | if fp: | |
| 89 | fp.close() | |
| 90 | </pre></div> | |
| 91 | ||
| 92 | <P> | |
| 93 | A more complete example that implements hierarchical module names and | |
| 94 | includes a <tt class="function">reload()</tt><a id='l2h-723' xml:id='l2h-723'></a> function can be | |
| 95 | found in the module <tt class="module">knee</tt><a id='l2h-724' xml:id='l2h-724'></a>. The | |
| 96 | <tt class="module">knee</tt> module can be found in <span class="file">Demo/imputil/</span> in the | |
| 97 | Python source distribution. | |
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