code: def encode(claims, key, algorithm=ALGORITHMS.HS256, headers=None, access_token=None):
      
  
      for time_claim in ['exp', 'iat', 'nbf']:
  
          # Convert datetime to a intDate value in known time-format claims
          if isinstance(claims.get(time_claim), datetime):
              claims[time_claim] = timegm(claims[time_claim].utctimetuple())
  
      if access_token:
          claims['at_hash'] = calculate_at_hash(access_token,
                                                ALGORITHMS.HASHES[algorithm])
  
      return jws.sign(claims, key, headers=headers, algorithm=algorithm)
docs: Encodes a claims set and returns a JWT string.
  
      JWTs are JWS signed objects with a few reserved claims.
  
      Args:
          claims (dict): A claims set to sign
          key (str or dict): The key to use for signing the claim set. Can be
              individual JWK or JWK set.
          algorithm (str, optional): The algorithm to use for signing the
              the claims.  Defaults to HS256.
          headers (dict, optional): A set of headers that will be added to
              the default headers.  Any headers that are added as additional
              headers will override the default headers.
          access_token (str, optional): If present, the 'at_hash' claim will
              be calculated and added to the claims present in the 'claims'
              parameter.
  
      Returns:
          str: The string representation of the header, claims, and signature.
  
      Raises:
          JWTError: If there is an error encoding the claims.
  
      Examples:
  
          >>> jwt.encode({'a': 'b'}, 'secret', algorithm='HS256')
          'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJhIjoiYiJ9.jiMyrsmD8AoHWeQgmxZ5yq8z0lXS67_QGs52AzC8Ru8'