Initial data commit

Task/Singly-linked-list-Element-definition/Python/singly-linked-list-element-definition.py

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+class LinkedList(object):
+     """USELESS academic/classroom example of a linked list implemented in Python.
+        Don't ever consider using something this crude!  Use the built-in list() type!
+     """
+	class Node(object):
+		def __init__(self, item):
+			self.value  = item
+			self.next = None
+	def __init__(self, item=None):
+		if item is not None:
+			self.head = Node(item); self.tail = self.head
+		else:
+			self.head = None; self.tail = None
+	def append(self, item):
+		if not self.head:
+			self.head = Node(item)
+			self.tail = self.head
+		elif self.tail:
+			self.tail.next = Node(item)
+			self.tail = self.tail.next
+		else:
+			self.tail = Node(item)
+	def __iter__(self):
+		cursor = self.head
+		while cursor:
+			yield cursor.value
+			cursor = cursor.next