Removed is_prime from utils because it is unused.

src/rules/utils.py

@@ -10,23 +10,6 @@ def nary_node(operator, scope):
            else Node(operator, nary_node(operator, scope[:-1]), scope[-1])
 
 
-def is_prime(n):
-    """
-    Check if the given integer n is a prime number.
-    """
-    if n == 2:
-        return True
-
-    if n < 2 or not n & 1:
-        return False
-
-    for i in xrange(3, int(n ** .5) + 1, 2):
-        if not divmod(n, i)[1]:
-            return False
-
-    return True
-
-
 def gcd(a, b):
     """
     Return greatest common divisor using Euclid's Algorithm.

tests/test_rules_utils.py

@@ -1,5 +1,5 @@
 from src.node import ExpressionNode as N
-from src.rules.utils import nary_node, is_prime, least_common_multiple
+from src.rules.utils import nary_node, least_common_multiple
 from tests.rulestestcase import RulesTestCase, tree
 
 
@@ -15,17 +15,6 @@ class TestRulesUtils(RulesTestCase):
         self.assertEqualNodes(nary_node('+', [a, b, c, d]),
                               N('+', N('+', N('+', a, b), c), d))
 
-    def test_is_prime(self):
-        self.assertTrue(is_prime(2))
-        self.assertTrue(is_prime(3))
-        self.assertTrue(is_prime(647))
-
-        self.assertFalse(is_prime(0))
-        self.assertFalse(is_prime(1))
-        self.assertFalse(is_prime(4))
-        self.assertFalse(is_prime(9))
-        self.assertFalse(is_prime(100))
-
     def test_least_common_multiple(self):
         self.assertEqual(least_common_multiple(5, 6), 30)
         self.assertEqual(least_common_multiple(5, 6, 15), 30)