initial commit

pig_lite/datastructures/stack.py

@@ -0,0 +1,21 @@
+from collections import deque
+
+
+class Stack(object):
+    def __init__(self):
+        self.d = deque()
+
+    def put(self, v):
+        self.d.append(v)
+
+    def get(self):
+        return self.d.pop()
+
+    def has_elements(self):
+        return len(self.d) > 0
+
+    def __iter__(self):
+        return iter(self.d)
+
+    def __repr__(self):
+        return ('Stack [' + ','.join((str(item) for item in self.d)) + ']')