Session 8 - Natallia Paliashchuk

NatalliaPaliashchuk/hw8.py

@@ -0,0 +1,57 @@
+import unittest
+from unittest.mock import patch
+
+class Error(Exception): pass
+
+class ArgError(Error): pass
+
+def iseven(num):
+    try:
+        if num % 2 == 0:
+            return True
+        else:
+            return False
+    except Exception:
+        raise ArgError('Bad arg')
+
+
+def goldbach_conjecture():
+    while True:
+        ent = input()
+        if 'q'== ent: break
+        try:
+            ent = int(ent)
+        except ValueError:
+            print('Enter the correct even number')
+            continue
+        if not iseven(ent) or ent < 4:
+            print('Enter the correct even number')
+            continue
+        prime = []
+        for i in range(2, ent):
+            cnt = 0
+            for j in range(2, i + 1):
+                if i % j == 0:
+                    cnt += 1
+            if cnt == 1:
+                prime.append(i)
+        for i, val in enumerate(prime):
+            for j in prime[i:]:
+                if val + j == ent:
+                    print(val, j)
+
+class TestGoldbachsConjecture(unittest.TestCase):
+    def test_iseven(self):
+        self.assertTrue(iseven(2))
+        self.assertFalse(iseven(1))
+        with self.assertRaises(ArgError):
+            iseven('')
+
+    @patch('input()', return_value='4')
+    def test_goldbach_conjecture(self):
+        self.assertEqual(goldbach_conjecture(), '2 2')
+
+
+
+if __name__ == '__main__':
+    unittest.main(argv=[''], exit=False)