Some functions are Boolean in nature, returning a “yes” or “no” answer, or, more appropriately, a non-zero or zero value, respectively. Procedures are simply special cases, functions that do not ...

from functools import lru_cache from math import sin @lru_cache def sin_half(x): return sin(x)/2 Now, every time you run the decorated function, lru_cache will check for a cached result for the ...