Added Queue

Author: ShyamW

data_structures/QueueOnList.py

@@ -0,0 +1,35 @@
+"""Queue represented by a python list"""
+class Queue():
+    def __init__(self):
+        self.entries = []
+        self.length = 0
+
+    """Enqueues {@code item}
+    @param item
+        item to enqueue"""
+    def enqueue(self, item):
+        self.entries.append(item)
+        self.length = self.length + 1
+        print(self.entries)
+
+    """Dequeues {@code item}
+    @requirement: |self.length| > 0
+    @return dequeued
+        item that was dequeued"""
+    def dequeue(self):
+        self.length = self.length - 1
+        dequeued = self.entries[0]
+        self.entries = self.entries[1:]
+        return dequeued
+
+    """Enqueues {@code item}
+    @return item at front of self.entries"""
+    def front(self):
+        return self.entries[0]
+
+    """Returns the length of this.entries"""
+    def length(self):
+        return self.length
+
+
+