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POUse a class in the context of a different module
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7495886
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2011-09-21T07:10:48.550
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2011-10-11T12:24:17.143
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2017-05-23T12:03:34.927
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149482
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<p>I want to modify some classes in the standard library to use a different set of globals the ones that other classes in that module use.</p> <h2>Example</h2> <p>This example is an example only:</p> <pre><code># module_a.py my_global = [] class A: def __init__(self): my_global.append(self) class B: def __init__(self): my_global.append(self) </code></pre> <p>In this example, If I create an instance of <code>A</code>, via <code>A()</code>, it will call <code>append</code> on the object named by <code>my_global</code>. But now I wish to create a new module, import <code>B</code> to it, and have <code>B</code> use <code>my_global</code> from the module it's been imported into, instead of the <code>my_global</code> from the module <code>B</code> was original defined.</p> <pre><code># module_b.py from module_a import B my_global = [] </code></pre> <h2>Related</h2> <p>I'm struggling to explain my problem, here is my previous attempt which did in fact ask something completely different:</p> <ul> <li><a href="https://stackoverflow.com/q/7483022/149482">Clone a module and make changes to the copy</a></li> </ul> <h2>Update0</h2> <ul> <li>The example above is only for illustration of what I'm trying to achieve.</li> <li>Since there is no variable scope for classes (unlike say, C++), I think a reference to a globals mapping is not stored in a class, but instead is attached to every function when defined.</li> </ul> <h2>Update1</h2> <p>An example was requested from the standard library:</p> <p>Many (maybe all?) of the classes in the <a href="http://hg.python.org/cpython/file/0408001e4765/Lib/threading.py" rel="nofollow noreferrer"><code>threading</code></a> module make use of globals such as <code>_allocate_lock</code>, <code>get_ident</code>, and <code>_active</code>, defined <a href="http://hg.python.org/cpython/file/0408001e4765/Lib/threading.py#l26" rel="nofollow noreferrer">here</a> and <a href="http://hg.python.org/cpython/file/0408001e4765/Lib/threading.py#l595" rel="nofollow noreferrer">here</a>. One cannot change these globals without changing it for all the classes in that module.</p>
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<python><module><namespaces><python-3.x><globals>
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Use a class in the context of a different module
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