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    <p><a href="http://docs.python.org/2/reference/datamodel.html#object.__init__" rel="nofollow noreferrer"><code>__init__</code></a> is the hook used to initialize your instance. (it is always called when you create an instance).</p> <p><code>init__</code> is just a class method with a wonky name.</p> <p>You need to show us your code; if something is broken when you have a method named <code>__init__</code> you made a mistake there. Renaming it to <code>init__</code> just means it won't be called automatically, thus not triggering your coding mistake.</p> <p>In the <a href="https://stackoverflow.com/questions/11899959/python-is-it-possible-to-instantiate-an-object-of-one-class-in-two-different-wa#comment15841610_11900405">comment you refer to</a>, the author <em>did</em> use <code>__init__</code> in his comment but forgot to escape the leading underscores, and they were interpreted as code to start bold text instead:</p> <pre><code>__this is bold__ </code></pre> <p>becomes <strong>this is bold</strong>. Note that the trailing <code>__</code> on <code>__main__</code> <em>also</em> is lost in that comment.</p> <p>In your updated code, you are trying to override the <code>__init__</code> method of a (subclass) of tuple, which is a special case. By renaming the <code>__init__</code> method to <code>init__</code> you created a <em>different</em> method and did not run into this common problem at all.</p> <p>See <a href="https://stackoverflow.com/questions/1565374/subclassing-python-tuple-with-multiple-init-arguments">Subclassing Python tuple with multiple __init__ arguments</a> for more detail on why this is a problem; you have to create a <code>__new__</code> method instead. <a href="http://docs.python.org/2/reference/datamodel.html#object.__new__" rel="nofollow noreferrer"><code>__new__</code></a> is the factory method to create instances, <code>__init__</code> then initializes the data. But that doesn't work on immutable types such as <code>namedtuple</code> or <code>tuple</code>, since you are not supposed to change the instance after the factory created it.</p> <p>In this specific case, you do not need an <code>__init__</code> or a <code>__new__</code> method <em>at all</em> because the <code>namedtuple</code> subclass <code>Point</code> already takes care of the initialization of the <code>x</code>, <code>y</code> and <code>z</code> attributes. By renaming <code>__init__</code> to <code>init__</code> you made things work, but you do end up with a pointless <code>init__</code> method that you'll never use. Just delete it.</p>
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    1. POWhat is the difference between init__ and __init__ in python class?
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    1. USMartijn Pieters
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    1. COI understand, thank you. The last paragraph explains everything.
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