Create stack_using_linkedlist.py

Author: Tanmay-901

stack/stack_using_linkedlist.py

@@ -0,0 +1,66 @@
+class Node:
+    def __int__(self, value=None):
+        self.value = value
+        self.next = next
+
+
+class LinkedList:
+    def __init__(self):
+        self.head = None
+
+    def __iter__(self):
+        currnode = self.head
+        while currnode:
+            yield currnode
+            currnode = currnode.next
+
+
+class Stack:
+    def __init__(self):
+        self.LinkedList = LinkedList()
+
+    def __str__(self):
+        values = [str(x.value) for x in self.LinkedList]
+        return '\n'.join(values)
+
+    def isEmpty(self):
+        if self.LinkedList.head is None:
+            return True
+        else:
+            return False
+
+    def push(self, value):
+        node = Node()
+        node.value = value
+        node.next = self.LinkedList.head
+        self.LinkedList.head = node
+
+    def pop(self):
+        if self.isEmpty():
+            print("Stack underflow")
+        else:
+            node = self.LinkedList.head.value
+            self.LinkedList.head = self.LinkedList.head.next
+            return node
+
+    def peak(self):
+        if self.isEmpty():
+            print("Stack underflow")
+        else:
+            node = self.LinkedList.head.value
+            return node
+
+    def delete(self):
+        self.LinkedList.head = None
+
+
+customStack = Stack()
+print(customStack.isEmpty())
+customStack.push(1)
+customStack.push(2)
+customStack.push(3)
+print(customStack)
+print("_________")
+print(customStack.pop())
+print("_________")
+print(customStack.peak())