math - python: code optimisation by precalculation of constant therms -

i write flexible simulation program. flexibe because user should able customize calculations via python code. customisation begins defining "constants" (constants in sense can never change value). can use constants , few known predefined variables define python calculation code. code later processed in fixed program code. here simplified example:

# begin user input width = 20.0  # user defined constants cond = 10.0 calc_code = "cond*width*x"  # x known changing variable # end user input  # begin hidden fixed program code code = compile( ''' def calc(x):  # function executes user code     return ''' + calc_code   , '<string>', 'exec')  exec(code)  # python 2.x remove brackets  x in range(10):     print(calc(x))  # python 2.x remove brackets # end hidden fixed program code 

the problem user code executed , slows down calculation significantly. possible somehow automaticaly find , precalculate constant terms in code (cond*width) significant speedup?