Added feature Stack Using Two Queues

Author: OneSouhardyo

.vscode/settings.json

@@ -1,5 +1,6 @@
 {
     "githubPullRequests.ignoredPullRequestBranches": [
         "master"
-    ]
+    ],
+    "python.analysis.typeCheckingMode": "basic"
 }

data_structures/stacks/TwoQueuedStack.py

@@ -0,0 +1,65 @@
+class StackUsingQueues:
+    def __init__(self):
+        """
+        Initialising required queues using lists data structure
+        """
+        self.queue1 = []
+        self.queue2 = []
+
+    def push(self,item):
+        while len(self.queue1)!= 0:
+            """
+            enqueuing queue 2 using the values from queue 1 bringing them out in First
+            In First Out (F.I.F.O) order.
+            """
+            self.queue2.append(self.queue1[0])
+            self.queue1 .pop(0)
+            """
+            adding the new value to queue 1
+            """
+        self.queue1.append(item)
+
+        """
+        returning the values from queue 2 to queue 1 so as
+        to replicate the stack data structure
+        """
+        while len(self.queue2)!= 0:
+            self.queue1.append(self.queue2[0])
+            self.queue2.pop(0)
+
+
+
+
+    def pop(self):
+        if len(self.queue1) != 0:
+            """
+            The first value of queue 1 is being popped here as it
+            has been implemented in a way that the
+            first value of the queue which gets popped is the last value of the stack.
+            And since stack follows Last In First Out (L.I.F.O) order the
+            following has been implemented.
+            """
+            popped = self.queue1[0]
+            self.queue1.pop(0)
+            return popped
+        else:
+            return None
+
+
+
+
+
+
+
+    def peek(self):
+        """
+        Function to see the last value inserted in the stack
+        implemented using queue here, which has the last
+        value of the stack as its first.
+        """
+        if len(self.queue1) != 0:
+            return self.queue1[0]
+        else:
+            return None
+
+