text: user439: I am using the biopython Entrez.efetch command to retrieve all features (CDS, mRNA, ...) of some genomes.
  In this case (NC_014649, Acanthamoeba polyphaga mimivirus), it works as expected:
  from Bio import Entrez, SeqIO
  handle = Entrez.efetch(id='NC_014649', db='nuccore', rettype='gb')
  records = SeqIO.read(handle, 'gb')
  records.features
  
  [SeqFeature(FeatureLocation(ExactPosition(0), ExactPosition(1181549), strand=1), type='source'),
   SeqFeature(FeatureLocation(ExactPosition(191), ExactPosition(2609), strand=1), type='gene'),
   SeqFeature(FeatureLocation(ExactPosition(191), ExactPosition(2609), strand=1), type='mRNA'),
   SeqFeature(FeatureLocation(ExactPosition(191), ExactPosition(2579), strand=1), type='CDS'),
  ...
  
  However in this case (NC_010830, Candidatus Amoebophilus asiaticus), it only returns one record for the whole genome.
  handle = Entrez.efetch(id='NC_010830', db='nuccore', rettype='gb')
  records = SeqIO.read(handle, 'gb')
  records.features
  [SeqFeature(FeatureLocation(ExactPosition(0), ExactPosition(1884364), strand=1), type='source')]
  
  However, if I check the corresponding file in the browser, it does have features: https://www.ncbi.nlm.nih.gov/nuccore/NC_010830.1
  What could be the reason for this inconsistency ? Did I  miss something ?
  
  user3577: This has been answered before. See: https://stackoverflow.com/a/55402322/6262370
  In short, you need to either use rettype='gbwithparts' or rettype='gb', style='withparts' to download the entire genbank flat file.
  
original_text: 439: <p>I am using the biopython Entrez.efetch command to retrieve all features (CDS, mRNA, ...) of some genomes.</p>
  
  <p>In this case (NC_014649, Acanthamoeba polyphaga mimivirus), it works as expected:</p>
  
  <pre><code>from Bio import Entrez, SeqIO
  handle = Entrez.efetch(id='NC_014649', db='nuccore', rettype='gb')
  records = SeqIO.read(handle, 'gb')
  records.features
  
  [SeqFeature(FeatureLocation(ExactPosition(0), ExactPosition(1181549), strand=1), type='source'),
   SeqFeature(FeatureLocation(ExactPosition(191), ExactPosition(2609), strand=1), type='gene'),
   SeqFeature(FeatureLocation(ExactPosition(191), ExactPosition(2609), strand=1), type='mRNA'),
   SeqFeature(FeatureLocation(ExactPosition(191), ExactPosition(2579), strand=1), type='CDS'),
  ...
  </code></pre>
  
  <p>However in this case (NC_010830, Candidatus Amoebophilus asiaticus), it only returns one record for the whole genome.</p>
  
  <pre><code>handle = Entrez.efetch(id='NC_010830', db='nuccore', rettype='gb')
  records = SeqIO.read(handle, 'gb')
  records.features
  [SeqFeature(FeatureLocation(ExactPosition(0), ExactPosition(1884364), strand=1), type='source')]
  </code></pre>
  
  <p>However, if I check the corresponding file in the browser, it does have features: <a href="https://www.ncbi.nlm.nih.gov/nuccore/NC_010830.1" rel="nofollow noreferrer">https://www.ncbi.nlm.nih.gov/nuccore/NC_010830.1</a></p>
  
  <p>What could be the reason for this inconsistency ? Did I  miss something ?</p>
   3577: <p>This has been answered before. See: <a href="https://stackoverflow.com/a/55402322/6262370">https://stackoverflow.com/a/55402322/6262370</a></p>
  
  <p>In short, you need to either use <code>rettype='gbwithparts'</code> or <code>rettype='gb', style='withparts'</code> to download the entire genbank flat file.</p>
  