Functional dependence

[brombo]

If I have a sympy expression, g, that is a function of sympy symbols (say x, y, z, and t) how can I determine that g is not dependent on any other symbols.  The context for this is that I wish to determine if I have a metric tensor that tensor is a function only of x, y, z, and t and not a fuction of any other symbols (for example spherical coordinates) so that I can know that if I substitute numerical values for x, y, z, and t all components of the metric tensor will be numbers that depend on no parameters.

[Aaron Meurer]

Use g.free_symbols to get all the variables that g depends on.

Aaron Meurer

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