Possible static attribute issue about asset-declarations

[danniel]

>>> class Something:
...     a = []
...     def append(self, item):
...             self.a.append(item)
... 
>>> one = Something()
>>> one.append(12)
>>> one.append(13)
>>> one.a
[12, 13]
>>> two = Something()
>>> two.append(14)
>>> two.a
[12, 13, 14]
>>> 

This happens because one.a and two.a point to the same list.

[catileptic]

You're right, this was my mistake.

Adding all_positions as an instance variable will solve this. That means it should be initialized in the __init__ (or via some other method that would make it an instance variable).

[catileptic]

Closed by #181