title: Biopython search based on accession number
body: <p>Currently I am using biopython to loop over an list with accession numbers to retrieve some information about the proteins. I would like to check the isoelectric point, Amino acid composition,Theoretical pI, Number of amino acids and the Molecular weight. Some of those properties I can find, but for some I don't know how to get them. Hopefully somebody can help me. </p>
  
  <p>Please find a summary of my code below:</p>
  
  <pre><code>from bio import ExPASy, SwissProt
  
  accession='P04264'
  handle = ExPASy.get_sprot_raw(accession)
  record = SwissProt.read(handle)
  
  Sequence_length=record.sequence_length
  Weight= record.seqinfo[1]
  </code></pre>
  
  <p>As you can see, I figured out how to get the sequence length and the weight, but I did not manage to get the other properties (isoelectric point, Amino acid composition,Theoretical pI). Does somebody know how to get those values, using bioptyhon? </p>
  
  <p>Thanks in advance.</p>