import phylanx

# A + B

variables = {
    'A' : phylanx.execution_tree.var(1.0),
    'B' : phylanx.execution_tree.var(41.0)
}

p = phylanx.execution_tree.generate_tree('A + B', variables)
print(p.eval())

variables['B'].assign(66.0)
print(p.eval())