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Is this accurate
desktop thread
Writing a simple CAS in Python
In my downtime, I'm writing a CAS in Python. It has to be from scratch, because I want it to fit on my calculator, and all of the solutions out there import a lot of data. Currently, there are two separate programs, one which can do full polynomial arithmetic, but you have to type in the polynomial in program form, as a list of coefficients starting from x^0. I'm working on merging it with the CAS interface, which will evaluate expressions recursively. For example: (sin x)^2 is sin inputted into the function f(y) = y^2. Though I don't have time to make this logic perfect, it will be interesting to learn how to program a u-substitution for arbitrary input.
What is the best parser abstraction?
Functional or object-oriented; don't really care which. Must be able to give detailed non-obstuse error messages.
This includes topics such as data structures, algorithms, computation theory, programming languages, compilers, etc.
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