Create stack_data_structure.py

Author: Amogh Singhal

stack_data_structure.py

@@ -0,0 +1,25 @@
+class Stack:
+  def __init__(self):
+    self.stack = []
+    
+  def push(self, value):
+    self.stack.append(value)
+    
+  def pop(self):
+    if self.isEmpty():
+      print("Stack underflow...")
+      return None
+    else:
+      self.stack.pop()
+    
+  def size(self):
+    return len(self.stack)
+    
+  def isEmpty(self):
+    return self.size() == 0
+    
+  def peek(self):
+    if self.isEmpty():
+      return None
+    else:
+      return self.stack[-1]