Porblem with xlutils/xlrd/xlwt

[pp]

On Jan 9, 3:42 am, Jon Clements <jon... at googlemail.com> wrote:
> On Jan 9, 10:24 am, pp <parul.pande... at gmail.com> wrote:
>
>
>
> > Whenever i run the code below I get the following error:
>
> > AttributeError: 'Book' object has no attribute 'on_demand'
> > WARNING: Failure executing file: <copy.py>
>
> > Why is it so??
>
> > from xlrd import open_workbook
> > from xlwt import easyxf
> > from xlutils.copy import copy
> > rb =  open_workbook('source.xls',formatting_info=True)
> > rs =  rb.sheet_by_index(0)
> > wb =  copy(rb)
> > ws =  wb.get_sheet(0)
> > plain = easyxf('')
> > for i,cell in enumerate(rs.col(2)):
> >      if not i:
> >          continue
> >      ws.write(i,2,cell.value,plain)
> > for i,cell in enumerate(rs.col(4)):
> >      if not i:
> >          continue
> >      ws.write(i,4,cell.value-1000)
> > wb.save('output.xls')
>
> I suspect your version of xlrd is not up to date (although I thought
> on_demand was ages ago!).
> Make sure all the tools are the latest versions fromhttp://www.python-excel.org
>
> There's also a dedicated Google Group for the xl* products listed on
> that page.
>
> hth
> Jon.

yeah all my versions are latest from http://www.python-excel.org .
just checked!!
what could be the problem?