It's mostly philosophical, are you fine with blowing up with an exception, or would you rather have your functions return known values for the unhappy path? I p

It's mostly philosophical, are you fine with blowing up with an exception, or would you rather have your functions return known values for the unhappy path? I personally like exceptions in exceptional cases, but much rather having functions with explicit contracts (e.g. "this will return either True or False in all input cases", not "this will return either True, or Exception in all cases when $foo doesn't exist in the database, and woe unto the programmer that forgets to catch this.")