old_contents: # pipeurlbuilder.py
  #
  
  import urllib
  from pipe2py import util
  
  def pipe_urlbuilder(context, _INPUT, conf, **kwargs):
      """This source builds a url and yields it forever.
      
      Keyword arguments:
      context -- pipeline context
      _INPUT -- not used
      conf:
          BASE -- base
          PATH -- path elements
          PARAM -- query parameters
      
      Yields (_OUTPUT):
      url
      """
      
      for item in _INPUT:
          #note: we could cache get_value results if item==True
          url = util.get_value(conf['BASE'], item, **kwargs)
          if not url.endswith('/'):
              url += '/'
          
          path = util.get_value(conf['PATH'], item, **kwargs)
          if not isinstance(path, list):
              path = [path]
          
          url += "/".join(path)
          
          params = dict([(util.get_value(p['key'], item, **kwargs), util.get_value(p['value'], item, **kwargs)) for p in conf['PARAM']])
          if params:
              url += "?" + urllib.urlencode(params)
          
          yield url
  
  
new_contents: # pipeurlbuilder.py
  #
  
  import urllib
  from pipe2py import util
  
  def pipe_urlbuilder(context, _INPUT, conf, **kwargs):
      """This source builds a url and yields it forever.
      
      Keyword arguments:
      context -- pipeline context
      _INPUT -- not used
      conf:
          BASE -- base
          PATH -- path elements
          PARAM -- query parameters
      
      Yields (_OUTPUT):
      url
      """
      
      for item in _INPUT:
          #note: we could cache get_value results if item==True
          url = util.get_value(conf['BASE'], item, **kwargs)
          if not url.endswith('/'):
              url += '/'
          
          path = util.get_value(conf['PATH'], item, **kwargs)
          if not isinstance(path, list):
              path = [path]
          
          url += "/".join(path)
          url = url.rstrip("/")
          
          params = dict([(util.get_value(p['key'], item, **kwargs), util.get_value(p['value'], item, **kwargs)) for p in conf['PARAM']])
          if params:
              url += "?" + urllib.urlencode(params)
          
          yield url
  
  
subject: Remove trailing slash (google charts don't like it)