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POAccessing methods from objects within a list
 

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  1. POAccessing methods from objects within a list
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    <p>I am new to Python (having come from C++) so I am still getting used to some things.</p> <p>I have created a class called Sensor which I am using as a sensor that detects when an avatar or a player moves in to it. I want to have up to 20 sensors as one time so I would like to store them in a list and then iterate through the list, checking each one for a detected entry. </p> <p>I have the following code:</p> <pre><code>class Sensor: def __init__(self, loc, size=1, enabled=True): self.enabled = enabled self.distOfBorderFrmCentre = size / 2.0 self.location = loc # Additional Sensor code here. Just not implemented yet so would not # benefit the post. def position(self): # No real use. Using this function for demo reasons return self.position self.sensors = [ Sensor(loc) for loc in self.route ] for i in range(len(self.sensors)): print self.sensors[i].position() # Also gives same output #for sensor in self.sensors: #print sensor .position() </code></pre> <p>The output I am given is:</p> <pre><code>&lt;bound method Sensor.position of &lt;sensor.Sensor instance at 0x03628E40&gt;&gt; &lt;bound method Sensor.position of &lt;sensor.Sensor instance at 0x03628DC8&gt;&gt; &lt;bound method Sensor.position of &lt;sensor.Sensor instance at 0x03628DF0&gt;&gt; &lt;bound method Sensor.position of &lt;sensor.Sensor instance at 0x03628E18&gt;&gt; &lt;bound method Sensor.position of &lt;sensor.Sensor instance at 0x03628E40&gt;&gt; </code></pre> <p>So am I missing something? I suspect I probably am. I have searched and searched but every time I see examples of calling methods from objects within lists, the syntax I listed above is what is used.</p> <p>Thanks</p>
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    1. USChris
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    1. COIs the indentation correct here? what is `self`? Also, generally loops like `for i in range(len(...))` can be simplified. `for sensor in self.sensors: # do something with a sensor`
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      1. USmgilson
    2. COWell... that's the output I would expect... the return value of `position` is a reference to the `position` method... which you're then printing... When you ommited the `()` you were printing the reference directly, now that you're calling it, it's returning the `self.position` anyway...
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      1. USJon Clements
    3. COApologies, the indentation is correct. If it is incorrect then it is me pasting it wrongly in the question. Self explicitly shows that the variable is a member of the class. And I have also tried for sensor in self.sensors: #do something. I shall update my question to show this
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      1. USChris
 

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