Translation of the Ruby version. Should work in either Python 2.x or 3.x. Everything I said in the description of the Ruby version applies here, although I will point out that this version is probably faster simply because Python is generally faster than Ruby (assuming we're talking about CPython vs YARV or MRI - JRuby vs Jython may be a differe…

is_prime.py

#   Returns True or False depending on whether a given number (n) is prime
#   Translated from Ruby version

#   Jack Hooper 2014

def is_prime(n):
    if n <= 1:
        return False
    if n == 2: 
        return True
    for i in range(2, n):
        if n % i == 0: return False
    return True