return 0 elif val == 1 or val == 2: return 1 else: return self._calc(val-1)+self._calc(val-2) On an AMD Ryzen 5 3600, this code executes in about 20 seconds. Python is inefficient when it comes to ...

The traditional ways to do this in Python aren’t elegant. One is to write an if/elif/else chain of expressions. The other is to store values to match as keys in a dictionary, then use the values ...