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- In [1]: import sympy
- In [2]: (x, y, z) = sympy.symbols("x y z")
- In [3]: x+y**z
- Out[3]: x + y**z
- In [4]: (x+y**z).free_symbols
- Out[4]: {z, y, x}
- In [5]: sympy.init_printing()
- In [6]: x+y**z
- Out[6]:
- z
- x + y
- In [7]: (x+y**z).free_symbols
- Out[7]: set([x, y, z])
- In [8]: {1, 2, 3}
- Out[8]: set([1, 2, 3])
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