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ColorWall (view source)

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→‎2. Examine Effect and the interface its subclasses provide
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<code>effects.py</code> exports andan <code>Effects</code> list at the bottom of the file. <code>run.py</code> goes through every effect in that list, creates a new instance of the effect, and invokes its <code>run</code> method.
 
<b>Check your understanding</b>: what would happen if you added an effect to the <code>Effects</code> list that didn't implement a <code>run</code> method? (Try it!)
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=== 3. Examine the nested <code>for</code> loop in <code>SolidColorTest</code> ===
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