

def __init__(self, expression):
    ast.NodeVisitor.__init__(self)
    self.plugWrites = set()
    self.plugReads = set()
    self.contextReads = set()
    self.visit(ast.parse(expression))

dataset/ETHPy150Open ImageEngine/gaffer/python/Gaffer/PythonExpressionEngine.py _Parser.__init__/original