[Tutor] creating a range above & below a given number

[Emile van Sebille]

On 6/7/2009 7:08 AM Gonzalo Garcia-Perate said...
>  the solution laid somewhere in between:
> 
> def within_range(self, n, n2, threshold=5):
>         if n in range(n2-threshold, n2+threshold+1) and n <
> n2+threshold or n > n2 + threshold : return True
>         return False
> 

Be careful here -- you probably will get stung mixing ands and ors 
without parens.

 >>> print False and False or True
True
 >>> print False and (False or True)
False


The range test here can only serve to verify n as an integer, so you can 
simplify to:

def within_range(self, n, n2, threshold=5):
     if n == int(n) and (
       n < n2+threshold or n > n2 + threshold) :
         return True
     return False


Of course, the test in the function is a boolean, so you can return the 
result of the boolean directly and eliminate the return True and False 
statements:


def within_range(self, n, n2, threshold=5):
     return n == int(n) and (
       n < n2+threshold or n > n2 + threshold)


Emile