gistfile1.py

from pypy.rlib.parsing.tree import Node as PyNode
from pypy.rlib.parsing.lexer import SourcePos

class Node(PyNode):

    def __init__(self, source_position=None):
        self.source_position = source_position or SourcePos(-1,-1,-1)

    def __eq__(self, other): pass #...
   
    def dot(self): pass # ...
            
    def getsourcepos(self): # ...

class SelfSource(Node):
    def __init__(self, expressions=[], source_position=None):
        Node.__init__(self, source_position=source_position)
        self.expressions = expressions