title: "Series objects are mutable and cannot be hashed" error
body: <p>I am trying to get the following script to work. The input file consists of 3 columns: gene association type, gene name, and disease name.</p>
  
  <pre><code>cols = ['Gene type', 'Gene name', 'Disorder name']
  no_headers = pd.read_csv('orphanet_infoneeded.csv', sep=',',header=None,names=cols)
  
  gene_type = no_headers.iloc[1:,[0]]
  gene_name = no_headers.iloc[1:,[1]]
  disease_name = no_headers.iloc[1:,[2]]
  
  query = 'Disease-causing germline mutation(s) in' ###add query as required
  
  orph_dict = {}
  
  for x in gene_name:
      if gene_name[x] in orph_dict:
          if gene_type[x] == query:
              orph_dict[gene_name[x]]=+ 1
          else:
              pass
      else:
          orph_dict[gene_name[x]] = 0
  </code></pre>
  
  <p>I keep getting an error that says:</p>
  
  <blockquote>
    <p>Series objects are mutable and cannot be hashed</p>
  </blockquote>
  
  <p>Any help would be dearly appreciated!</p>