By eight

main.py

@@ -7,11 +7,11 @@ def divide_by_two(num): # Take last digit, divide by two only on that
 def divide_by_three(num): # Sum each digit in number, then checking that sum is divisible by three
     return _sum_digits(num) % 3 == 0
 
-def divide_by_four(num): # If last two digits are divisible by four
+def divide_by_four(num): # If last two digits are divisible by four, plus a simplifier of multiplying the tens place by two
-    if (num < 10): return num % 4 == 0
+    if (num <= 10): return num % 4 == 0
-    tens_place = _get_last_digit(num, 2)
+    tens_place = _get_last_digit(num, 2) * 10
     ones_place = _get_last_digit(num)
-    num_to_check = (tens_place * 10) + ones_place
+    num_to_check = (tens_place * 2) + ones_place
     return num_to_check % 4 == 0
 
 def divide_by_five(num): # If last digit is a zero or a five return true
@@ -22,6 +22,14 @@ def divide_by_six(num): # Same rules as dividing by three, and ensure original n
     num_sum = _sum_digits(num)
     return num_sum % 3 == 0 and divide_by_two(num)
 
+def divide_by_eight(num): # Same rules as dividing by four, but for last three digits
+    if (num <= 100): return num % 8 == 0
+    hundreds_place = _get_last_digit(num, 3) * 100
+    tens_place = _get_last_digit(num, 2) * 10
+    ones_place = _get_last_digit(num)
+    num_to_check = (hundreds_place * 4) + (tens_place * 2) + ones_place
+    return num_to_check % 8 == 0
+
 def divide_by_nine(num): # Same rules as dividing by three, but checking that sum is divisible by nine
     return _sum_digits(num) % 9 == 0
 

tests/eight_test.py

@@ -0,0 +1,22 @@
+from main import divide_by_eight
+import unittest
+
+class TestDivideByEight(unittest.TestCase):
+    def test_by_1(self):
+        self.assertFalse(divide_by_eight(1))
+    def test_by_2(self):
+        self.assertFalse(divide_by_eight(2))
+    def test_by_4(self):
+        self.assertFalse(divide_by_eight(4))
+    def test_by_8(self):
+        self.assertTrue(divide_by_eight(8))
+    def test_by_10(self):
+        self.assertFalse(divide_by_eight(10))
+    def test_by_16(self):
+        self.assertTrue(divide_by_eight(16))
+    def test_by_100(self):
+        self.assertFalse(divide_by_eight(100))
+    def test_by_800(self):
+        self.assertTrue(divide_by_eight(800))
+    def test_by_362880(self):
+        self.assertTrue(divide_by_eight(362880))

tests/four_test.py

@@ -1,7 +1,7 @@
 from main import divide_by_four
 import unittest
 
-class TestDivideByTwo(unittest.TestCase):
+class TestDivideByFour(unittest.TestCase):
     def test_by_1(self):
         self.assertFalse(divide_by_four(1))
     def test_by_2(self):