old_contents: try:
      from urllib2 import urlopen
  except ImportError:
      from urllib.request import urlopen
  
  import json
  
  def query_dgidb(genes):
      """
      Batch query DGIdb for drug-gene interaction data for
      a set of genes.
      """
  
      def convert(input):
          """
          Convert JSON UNICODE to plain ole strings.
          """
          if isinstance(input, dict):
              return {convert(key): convert(value) for key, value in input.iteritems()}
          elif isinstance(input, list):
              return [convert(element) for element in input]
          elif isinstance(input, unicode):
              return input.encode('utf-8')
          else:
              return input
  
      # make a single request to DGIdb for all of the genes requested
      dgidb_url = 'http://dgidb.genome.wustl.edu/api/v1/interactions.json?genes='
      
      # None is present by default. Make sure we have more than None
      if len(genes) > 1:
          query = dgidb_url + ','.join(genes.keys())
          
          response = urlopen(query)
          data = convert(json.load(response))
          matches = data['matchedTerms']
  
          # store the results for all of the genes. if there are no matches
          # in DGIdb, the result will be None.
          gene_dgidb_info = {}
          for gene in genes:
              gene_dgidb_info[gene] = None
  
          for match in matches:
              gene = match['searchTerm']
              gene_dgidb_info[gene] = dict(match)
  
          return gene_dgidb_info
      else:
          return None
  
new_contents: try:
      from urllib2 import urlopen
  except ImportError:
      from urllib.request import urlopen
  
  import json
  
  def query_dgidb(genes):
      """
      Batch query DGIdb for drug-gene interaction data for
      a set of genes.
      """
  
      def convert(input):
          """
          Convert JSON UNICODE to plain ole strings.
          """
          if isinstance(input, dict):
              return {convert(key): convert(value) for key, value in input.iteritems()}
          elif isinstance(input, list):
              return [convert(element) for element in input]
          elif isinstance(input, unicode):
              return input.encode('utf-8')
          else:
              return input
  
      # make a single request to DGIdb for all of the genes requested
      dgidb_url = 'http://www.dgidb.org/api/v2/interactions.json?genes='
  
      # None is present by default. Make sure we have more than None
      if len(genes) > 1:
          query = dgidb_url + ','.join(genes.keys())
  
          response = urlopen(query)
          data = convert(json.load(response))
          matches = data['matchedTerms']
  
          # store the results for all of the genes. if there are no matches
          # in DGIdb, the result will be None.
          gene_dgidb_info = {}
          for gene in genes:
              gene_dgidb_info[gene] = None
  
          for match in matches:
              gene = match['searchTerm']
              gene_dgidb_info[gene] = dict(match)
  
          return gene_dgidb_info
      else:
          return None
  
subject: update dgidb_url