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9348391
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2012-02-19T10:23:37.400
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That feeling like you should have done something else it's beacuse <code>hours</code>, <code>minutes</code>, <code>seconds</code> are properties. You don't really need those values stored as attributes of your object, you just want to be able to access those values when you need. Calling something like: <pre><code>>>> t1.hours 5 </code></pre> So, let's rewrite your example using <a href="http://docs.python.org/py3k/library/functions.html#property" rel="nofollow noreferrer"><code>property</code></a>: <pre class="lang-py prettyprint-override"><code>class MyTime: def __init__(self, hrs=0, mins=0, secs=0): self.totalsecs = hrs*3600 + mins*60 + secs @property def hours(self): return self.totalsecs // 3600 @property def minutes(self): return self._get_leftoversecs() // 60 @property def seconds(self): return self._get_leftoversecs() % 60 def _get_leftoversecs(self): return self.totalsecs % 3600 def increment(self, t): self.totalsecs += t </code></pre> Usage example: <pre class="lang-py prettyprint-override"><code>>>> t1 = MyTime(5,5,5) >>> t1.hours 5 >>> t1.hours() Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'int' object is not callable >>> t1.seconds 5 >>> t1.totalsecs 18305 >>> t1.increment(10) >>> t1.seconds 15 >>> t1.totalsecs 18315 </code></pre> I don't know if you noticed but you don't actually need the <code>increment</code> function anymore: <pre class="lang-py prettyprint-override"><code>>>> t1.totalsecs += 10 >>> t1.totalsecs 18325 </code></pre> I know that <code>property</code> must be a little ahead of what you're doing, but I thought it would have been worth an example. Edit: As <a href="https://stackoverflow.com/questions/9348034/python3-classes-oop-how-do-you-change-a-objects-self-values-with-a-method/9348391#comment11801734_9348391">Lattyware</a> noticed there's no need to make <code>totalsecs</code> a property too. To quote his comment: The great thing about Python's properties is you don't need to turn everything into getters and setters to keep a consistent interface like you do in some languages. There might be an advantage in setting <code>totalsecs</code> as a property (read-only) only if for some reason you want to hide the internal implementation of <code>MyTime</code> (obviously reintegrating the <code>increment()</code> method).
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1. COAgreed in all cases except your turning ``totalsecs`` into a property - it functions exactly as a normal attribute would, so why put in the extra functions? Just leave it as an attribute unless you need to change it. The great thing about Python's properties is you **don't** need to turn everything into getters and setters to keep a consistent interface like you do in some languages.
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2. CO@Lattyware: Good point. I just got a little carried away with property :) I've updated my answer.
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