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from sympy.core.basic import Basic
new = Basic.__new__
def assoc(d, k, v):
d = d.copy()
d[k] = v
return d
basic_fns = {'op': type,
'new': Basic.__new__,
'leaf': lambda x: not isinstance(x, Basic) or x.is_Atom,
'children': lambda x: x.args}
expr_fns = assoc(basic_fns, 'new', lambda op, *args: op(*args))