Amazon BrowseNode Browser
I’m working on a project that required a way to iteratively go through Amazon BrowseNodes. To do that I wanted to do a breadth first search through the tree and came up with a rather nice way to do that in Python.
There are a few resources that can be useful for finding browsenodes. The BrowseNodes.com website provides a crude way to browse through browsenodes. But it doesn’t offer the kind of control you might need in your own application.
Here’s a Python script that will print out browseNodes breadth first starting from the root node for books.
#!/usr/bin/env python """ Created by Matt Warren on 2009-09-08. Copyright (c) 2009 HalOtis.com. All rights reserved. """ import time import urllib try: from xml.etree import ElementTree except ImportError: from elementtree import ElementTree from boto.connection import AWSQueryConnection AWS_ACCESS_KEY_ID = 'YOUR ID' AWS_ASSOCIATE_TAG = 'YOUR TAG' AWS_SECRET_ACCESS_KEY = 'YOUR KEY' BROWSENODES = {} def bfs(root,children=iter): queue = [root, ] visited = list(set([])) while len(queue) > 0: node = queue.pop(0) visited.append(node) yield node for child in children(node): if not child in visited: queue.append(child) return def amazon_browsenodelookup_children(nodeId, searchIndex='Books'): aws_conn = AWSQueryConnection( aws_access_key_id=AWS_ACCESS_KEY_ID, aws_secret_access_key=AWS_SECRET_ACCESS_KEY, is_secure=False, host='ecs.amazonaws.com') aws_conn.SignatureVersion = '2' params = dict( Service='AWSECommerceService', Version='2009-07-01', SignatureVersion=aws_conn.SignatureVersion, AWSAccessKeyId=AWS_ACCESS_KEY_ID, AssociateTag=AWS_ASSOCIATE_TAG, Operation='BrowseNodeLookup', SearchIndex=searchIndex, BrowseNodeId=nodeId, Timestamp=time.strftime("%Y-%m-%dT%H:%M:%S", time.gmtime())) verb = 'GET' path = '/onca/xml' qs, signature = aws_conn.get_signature(params, verb, path) qs = path + '?' + qs + '&Signature=' + urllib.quote(signature) response = aws_conn._mexe(verb, qs, None, headers={}) content = response.read() tree = ElementTree.fromstring(content) NS = tree.tag.split('}')[0][1:] children = [] try: for node in tree.find('{%s}BrowseNodes'%NS).find('{%s}BrowseNode'%NS).find('{%s}Children'%NS).findall('{%s}BrowseNode'%NS): name = node.find('{%s}Name'%NS).text id = node.find('{%s}BrowseNodeId'%NS).text children.append( id ) BROWSENODES[id] = name except: return [] return children if __name__ == '__main__': BROWSENODES['1000'] = 'Books' count = 0 LIMIT = 25 for node in bfs('1000', amazon_browsenodelookup_children): count = count + 1 if count > LIMIT: break print BROWSENODES[node], '-', node
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