reorganize dir

Signed-off-by: Mia Steinkirch <mia.steinkirch@gmail.com>

ebook_src/real_interview_problems/stack.py

@@ -0,0 +1,40 @@
+
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
+class Stack(object):
+    def __init__(self):
+        self.content = []
+
+    def push(self, value):
+        self.content.append(value)
+
+    def pop(self):
+        if self.content:
+            return self.content.pop()
+        else:
+            return 'Empty List. '
+
+    def size(self):
+        return len(self.content)
+
+    def isEmpty(self):
+        return not bool(self.content)
+
+    def peek(self):
+        if self.content:
+            return self.content[-1]
+        else:
+            print('Stack is empty.')
+
+
+
+if __name__ == '__main__':
+    q = Stack()
+
+    for i in range(10):
+        q.push(i)
+    for i in range(11):
+        print q.pop()