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POHow to modify variables of another scope?
 

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  1. POHow to modify variables of another scope?
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    <p>Currectly, I'm trying the following: Some <code>mutator</code> function accepts other function's local scope using <code>locals()</code></p> <pre><code>def mutator(locals): locals['n'] = 10 locals['l'].append(10) def f(): n = 1 l = [1] mutator(locals()) print(n,l) # &gt;&gt;&gt; 1, [1,10] f(None) </code></pre> <p>and that works as expected: I was able to modify mutable list contents but failed to 'rebind' another immutable <code>int</code> to the same name.</p> <p>Currently, I see some options:</p> <ul> <li><code>eval()</code>, <code>exec()</code> &amp; Co</li> <li>Play with stack frames &amp; local variables in <code>mutator()</code></li> <li>Keep such variables in a <code>dict</code>: not very handy but probably the best one</li> </ul> <p>The restriction is: target function <code>f()</code> can contain just one function call, possibly with arguments, and that function should be able to alter values in <code>f()</code>s current scope.</p> <p>So.. is there a way to reintroduce variable's value (bind another object) at runtime? I don't believe there is no good trick to achive this!</p> <hr> <p>Here's an example of the thing I'm trying to achieve:</p> <pre><code>def view(request): # Yes, that's Django! q = MyModel.objects.all() data = { 'some_action': True, 'items_per_page': 50 } # defaults. Mutators can change this mutators.launch(locals(), data ) # Launch mutators that may want to narrow the QuerySet if data['some_action']: # do something useful if no mutator has disabled it ... # paginate using data['items_per_page'] </code></pre> <p>I don't want to use <code>data</code> dict here: ability to modify them as local variables would be much better &amp; pretty. Note that <code>q</code> QuerySet object is mutable &amp; mutators can alter its contents.</p>
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    1. COneeds more formatting. indent the method bodies.
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    2. COWhat exactly are you trying to accomplish?
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    3. COIt's going to be a way of runtime external tuning of function's internal logic, so to say :) Like switching certain booleans on&off to enable/disable features, narrow down some `list` to a subset, etc. I'm sure this is the best way to implement good tuning & extending framework for a highly customizable system.
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