Merge pull request #42 from sparrow1997/patch-1

Create stack.py #20

Python implementation DataStructures/stack.py

@@ -0,0 +1,28 @@
+
+#Make a class Stack
+class Stack:
+   def __init__(self):
+	         self.items = []
+
+	  def isEmpty(self):
+	         return self.items == []
+
+    def push(self, item):
+	         self.items.insert(0,item)
+
+	   def pop(self):
+	         return self.items.pop(0)
+
+     def peek(self):
+	         return self.items[0]
+
+      def size(self):
+	         return len(self.items)
+
+	#Calling Object of class Stack
+  s = Stack()
+
+  #Calling the function
+  s.push('hello')
+	s.push('true')
+	print(s.pop())