Problem with modifying test classes

[Panchendrarajan Ruba]

Currently I am working to fix the problem in my implementation.

https://github.com/sympy/sympy/pull/7311#issuecomment-38177849

Here I am returning a string which represent the way of finding the determinant of an nxn matrix. result is an str type. This the the line that raising an error while running the test classes,

 if strict:

        raise SympifyError(a)

How can I solve this????

[Aaron Meurer]

Don't use strings to do symbolic manipulation. Just create SymPy
objects and manipulate them directly. Not all SymPy functions work
with strings, which is the source of the error you are getting.

Aaron Meurer

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