[Tutor] Built In Functions

[Rafael Knuth]

>> def check_values(a, b):
>>      if all(number >= 0 for number in range(a, b)):
>>          return True
>>      else:
>>          raise ValueError("negative number")
>>
>> And:
>> def PositiveCalculator(a, b):
>>      if a > 0 and b > 0:
>>          return a + b
>>      else:
>>          raise ValueError("negative number")
>
>
> So zero is now considered a negative number?

Thanks ;-)
if a >= 0 and b >= 0