Add python implementation of queue

Python/data-structures/Queue.py

@@ -0,0 +1,21 @@
+class Queue:
+    def __init__(self):
+        self.items = []
+
+    def enqueue(self, item):
+        self.items.insert(0, item)
+
+    def dequeue(self):
+        if self.is_empty():
+            raise Exception("Queue is empty")
+        else:
+            return self.items.pop()
+
+    def peek(self):
+        return self.items[-1]
+
+    def size(self):
+        return len(self.items)
+
+    def is_empty(self):
+            return self.items == []

Python/data-structures/examples.py

@@ -0,0 +1,24 @@
+from Queue import Queue
+
+# ----------------- Queue -----------------
+q1 = Queue()
+
+# put elements in queue
+q1.enqueue(42)
+q1.enqueue(256)
+q1.enqueue(6)
+
+# look at the top of the queue
+print("Top element: ", q1.peek())
+
+# use the top element
+top = q1.dequeue()
+print("Top element in variable: ", top)
+print("Top element after using past top element: ", q1.peek())
+
+print("Size of queue: ", q1.size())
+# we can just dequeue elements without using
+q1.dequeue()
+q1.dequeue()
+print("Is queue empty now: ", q1.is_empty())
+