Getting Value from Object Attribute in separate file

Question

I am attempting to access a attribute from an object I have created in a separate python file.

I have tried the following code:

print(self.GENOME[0][0].x)

where self.GENOME[0][0] is the object memory address.

However, I get

AttributeError: 'set' object has no attribute 'x'

agent.py:

 import neuron

 #Creates an array of custom shape (3,4,3) and assigns unique object 
 #address

 for ii in range(len(_Topology)):
      _Genome[ii] = [{neuron.Neuron()} for i in range(_Topology[ii]+1)]

 #Calls object variable
 print(self.GENOME[0][0].x)

neuron.py:

class Neuron:

    def __init__(self):
        self.x = 50

Answer 1

_Genome[ii] contains a list that contains a set of at least on Neuron instance. Simplifying, you can make it like this:

>>> a = [{Neuron()} for _ in [1,2]]
>>> a
[{<__main__.Neuron object at 0x0000000002CAFF28>}, {<__main__.Neuron object at 0x0000000002CAFF60>}]
>>> q = [a]
>>> q
[[{<__main__.Neuron object at 0x0000000002CAFF28>}, {<__main__.Neuron object at 0x0000000002CAFF60>}]]
>>>

If you print _Genome , it will look something like that - I'm assuming _Genome is list-like | q above should be analogous to _Genome .

Indexing into it looks like this

>>> q[0]
[{<__main__.Neuron object at 0x0000000002CAFF28>}, {<__main__.Neuron object at 0x0000000002CAFF60>}]
>>> type(q[0])
<class 'list'>
>>> q[0][0]
{<__main__.Neuron object at 0x0000000002CAFF28>}
>>> type(q[0][0])
<class 'set'>
>>> 

Set behaviour is well documented - just like most of Python.

One way to access the contents of a set is with a for loop

>>> for thing in q[0][0]:
    print(thing.x)
50
>>> 

Another way to access the contents of a set is with the pop() method but this will remove an arbitrary item from the set. I don't think you really want this - you have no control over which item you get if there are more than one and the original set has one less item.

>>> x = [[{Neuron()},{Neuron}]]
>>> t = x[0][0].pop()
>>> t
<__main__.Neuron object at 0x0000000002C2F2E8>
>>> t.x
50
>>> x
[[set(), {<class '__main__.Neuron'>}]]
>>>

You could also make a list from the set and use indices to access the contents of the list.

>>> q
[[{<__main__.Neuron object at 0x0000000002CAFF28>}, {<__main__.Neuron object at 0x0000000002CAFF60>}]]
>>> z = list(q[0][0])
>>> z
[<__main__.Neuron object at 0x0000000002CAFF28>]
>>> z[0].x
50
>>>

---

All of that seems overly complicated and you would probably be better off changing the way you contain the Neuron instances. I have no idea if this is feasible for you. Just dispense with the set containing a single instance:

>>> a = [Neuron() for _ in [1,2]]
>>> a
[<__main__.Neuron object at 0x0000000002C2FDD8>, <__main__.Neuron object at 0x0000000002CD00B8>]
>>> q = [a]
>>> q[0][0]
<__main__.Neuron object at 0x0000000002C2FDD8>
>>> type(q[0][0])
<class '__main__.Neuron'>
>>> q[0][0].x
50
>>>