I have tried making the changes that you had suggested but the error still remains:

from armoryengine import *
from armoryengine.BDM import newTheBDM, TheBDM,BlockDataManager
from bitcointools.deserialize import extract_public_key
from bitcointools.util import short_hex, long_hex

def get_block_datetime(timestamp):
   # block_datetime = datetime.utcfromtimestamp(timestamp)
   block_datetime = datetime.utcfromtimestamp(timestamp)
   return "%d-%02d-%02d-%02d-%02d-%02d"%(block_datetime.year, block_datetime.month,
                                       block_datetime.day, block_datetime.hour,
                                       block_datetime.minute, block_datetime.second)

class BlockReader:
   newTheBDM(False)
   def __init__(self):
      self.index_db = shelve.open('armory_index');     
      self.bdm = TheBDM
      self.verbose = False
      self.coinbase = '0000000000000000000000000000000000000000000000000000000000000000'
      # self.pk_dict = {}
      self.pk_dict = bsddb.hashopen('pk_dict.bdb', 'n', cachesize=2000000)