ex_ottoyuhr wrote:
> class TreeCommand:
>     opcode = 0
>     children = []
>     def __init__(self, anOpcode) :
>         opcode = anOpcode
>
opcode and children in this case is more like "class" variable in C++.
If you want "instance" variable, you need to do it as self.opcode,
self.children, in all methods.

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