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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))
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