title: python.pyasn1 to express below strcture
body: <p>I am a new to Python and PYASN1, how to express below strcture? is there any docuement I can refer to? I search on the internect, there's a little document about the PYASN1</p>
  
  <pre><code>OtherInfo ::= SEQUENCE {
         keyInfo KeySpecificInfo,
         partyAInfo [0] OCTET STRING OPTIONAL,
         suppPubInfo [2] OCTET STRING
       }
  
  KeySpecificInfo ::= SEQUENCE {
      algorithm OBJECT IDENTIFIER,
      counter OCTET STRING SIZE (4..4) }
  </code></pre>