Python: How to evaluate a function which is string?

Question

I get some models from database as

f(t)=(2.128795454425367)+(208.54359721863273)*t+(26.098128487929266)*t^2+(3.34369909584111)*t^3+(-0.3450228278737971)*t^4+         


        

Answer 1

You can store the function as a python expersion in your database and when you get the string just do something like eval(funcstr.replace('x', 'yvalue')).

To show you an example:

funcstr = '2*x+5'
evalpoint = funcstr.replace('x', '5')
val = eval(funcstr)

At this point val should be evaluated to 15