From 4eddeb93964400cecbca44cc9b44994fe0eda70a Mon Sep 17 00:00:00 2001
From: James Mc Dermott <james.mcdermott89@gmail.com>
Date: Fri, 14 Oct 2016 16:15:26 +0100
Subject: [PATCH] Create __init__.py

Initialising of a Stack Class, has three methods: is_empty, push and pop.
---
 data_structures/Stacks/__init__.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 data_structures/Stacks/__init__.py

diff --git a/data_structures/Stacks/__init__.py b/data_structures/Stacks/__init__.py
new file mode 100644
index 000000000..1c6488562
--- /dev/null
+++ b/data_structures/Stacks/__init__.py
@@ -0,0 +1,23 @@
+class Stack:
+
+   def __init__(self):
+      self.stack = []
+      self.top = 0
+
+   def is_empty(self):
+      return self.top == 0
+
+   def push(self, item):
+      if self.top < len(self.stack):
+         self.stack[self.top] = item
+      else:
+         self.stack.append(item)
+
+      self.top += 1
+
+   def pop(self):
+      if self.is_empty():
+         return None
+      else:
+         self.top -= 1
+         return self.stack[self.top]