title: Differences between Biopython NCBI/Entrez esummary output and R package output
body: <p>I am new to accessing Entrez through Biopython and a couple of R packages (rentrez and reutil). When accessing the 'nuccore' database with esummary, the output fields returned by Biopython are different than that returned by the R packages. </p>
  
  <p>Python:</p>
  
  <pre><code>handle = Entrez.esearch(db='nuccore', term='183844[GPRJ]', retmax=75000)
  record = Entrez.read(handle)
  id_list = record["IdList"]
  search_results = Entrez.read(Entrez.epost("nuccore", id=",".join(id_list), restart=1, retmax=10000))
  webenv = search_results["WebEnv"]
  query_key = search_results["QueryKey"]
  handle1 = Entrez.esummary(db="nuccore", query_key=query_key, WebEnv=webenv)
  record1 = Entrez.read(handle1)
  </code></pre>
  
  <p>The fields returned by Biopython are:</p>
  
  <p>['AccessionVersion','Caption','Comment','CreateDate','Extra','Flags','Gi','Id',
  'Item','Length','ReplacedBy','Status','TaxId','Title','UpdateDate']</p>
  
  <p>R (reutil package):</p>
  
  <pre><code>trak &lt;- esearch('183844[GPRJ]', "nuccore", usehistory=TRUE, retmax = 70000)
  query_key &lt;- 1
  web_env &lt;- "NCID_1_224566406_130.14.18.34_9001_1496371219_1582367639_0MetA0_S_MegaStore_F_1"
  esum &lt;- esummary(db="nuccore", querykey = query_key, webenv = web_env, retstart = 1, retmax = 10000)
  gtrkr &lt;- content(esum, "parsed")
  </code></pre>
  
  <p>While the fields returned by R packages reutil and rentrez are:
  esummary result with 31 items:</p>
  
  <p>['uid', 'caption', 'title', 'extra', 'gi', 'createdate', 'updatedate', 'flags', 'taxid', 'slen', 'biomol', 'moltype', 'topology', 'sourcedb', 'segsetsize', 'projectid', 'genome', 'subtype', 'subname', 'assemblygi', 'assemblyacc', 'tech', 'completeness', 'geneticcode', 'strand', 'organism', 'strain', 'biosample', 'statistics', 'properties', 'oslt'] </p>
  
  <p>Thanks in advance.</p>