My output looks better sorted. I.e., for s in sorted(solutions)...
Giving the easier to read/compare:
Target 234, numbers = (100, 9, 7, 6, 3, 1)
(6, 1, 'add', 100, 'mul', 7, 'sub', 9, 'add', 3, 'div')
(6, 9, 'sub', 7, 'mul', 1, 'sub', 100, 'add', 3, 'mul')
(7, 3, 'mul', 6, 'sub', 9, 'mul', 1, 'sub', 100, 'add')
(7, 6, 'mul', 3, 'mul', 1, 'sub', 100, 'add', 9, 'add')
(7, 6, 'mul', 3, 'mul', 100, 'sub', 9, 'mul', 1, 'mul')
(100, 1, 'sub', 3, 'div', 7, 'mul', 6, 'sub', 9, 'add')
(100, 1, 'sub', 7, 'mul', 9, 'sub', 3, 'div', 6, 'add')
(100, 7, 'mul', 3, 'mul', 6, 'add', 9, 'div', 1, 'mul') *
(100, 7, 'mul', 6, 'sub', 1, 'sub', 9, 'add', 3, 'div')
(100, 7, 'sub', 3, 'div', 1, 'sub', 9, 'add', 6, 'mul')
(100, 7, 'sub', 3, 'div', 6, 'sub', 1, 'add', 9, 'mul')
(100, 9, 'add', 7, 'add', 1, 'add', 3, 'div', 6, 'mul')
(100, 9, 'sub', 7, 'div', 6, 'mul', 3, 'mul', 1, 'mul')
(100, 9, 'sub', 7, 'sub', 6, 'sub', 3, 'mul', 1, 'mul')
Terry
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