[Tutor] why the error?

[Timothy Wilson]

Hi everyone,

I've been working on some simple python programs, and I'm running into some
differences between the code I create in the interpretor and what's in a
text file. An example:

I wrote a little function that determines whether a given number is prime or
not. (I'm pretty sure the algorithm is correct.)

--snip--
from math import *

def isPrime(number):
   for j in range(2, sqrt(number)+1):
      if number % j == 0:
         return 0
   return 1

if __name__ == '__main__':
   number = raw_input("Which number? ")
   if isPrime(number):
      print "%i is prime." % number
   print "%i is not prime." % number
--snip--

This code seems to work perfectly when imported in the interpretor. When I
run it by typing 'python prime.py', I get:

[wilsont@galileo python]$ python prime.py
Which number? 11
Traceback (innermost last):
  File "prime.py", line 15, in ?
    if isPrime(number):
  File "prime.py", line 8, in isPrime
    for j in range(2, sqrt(number)+1):
TypeError: illegal argument type for built-in operation

Any hints? Why the difference?

-Tim

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