Merge pull request #120 from FabioDiBa/python-queue

add python queue

data structures/queue/python/queue.py

@@ -0,0 +1,15 @@
+class Queue:
+
+    def __init__(self):
+        self.list = []
+
+    def enqueue(self, element):
+        self.list.append(element)
+
+    def dequeue(self):
+        assert len(self.list) > 0; "Queue is empty"
+        return self.list.pop(0)
+
+    def isEmpty(self):
+        return len(self.list) == 0
+

data structures/queue/python/queue_test.py

@@ -0,0 +1,32 @@
+import unittest
+import queue
+
+class QueueTest(unittest.TestCase):
+
+    def setUp(self):
+        self.queue = queue.Queue()     
+
+    def test_enqueue(self):
+        self.queue.enqueue(23)
+        self.assertFalse(self.queue.isEmpty())
+
+    def test_empty(self):
+        self.assertTrue(self.queue.isEmpty())
+        self.queue.enqueue(42)
+        self.assertFalse(self.queue.isEmpty())
+
+    def test_error_when_queue_empty(self):
+        with self.assertRaises(AssertionError):
+            self.queue.dequeue()
+
+    def test_multiple_enqueue_dequeue(self):
+        elements = ['hi', 1, 'hu']
+
+        for element in elements:
+            self.queue.enqueue(element)
+
+        for element in elements:
+            self.assertEqual(self.queue.dequeue(), element)
+
+if __name__ == "__main__":
+    unittest.main()