[BioPython] about GenBank module

[김완규]

I've installed

python2.0
Martel0.5
mxTextTools
and biopython 1.0

successfully, but I got ImportError always in importing GenBank module
as follows :

>>> from Martel import *
>>> from Bio import GenBank
Traceback (innermost last):
  File "<pyshell#2>", line 1, in ?
    from Bio import GenBank
ImportError: cannot import name GenBank

Other modules were imported with no problem :

>>> from Bio import Blast
>>> from Bio import Medline
>>> from Bio import SCOP
>>> from Bio import SeqlO
....

Please Check the Genbank module and give me some advice.
Quick advice will be most appreciated.
thanks for reading.