[Biopython] IDLE problem

[xiaoa]

Hi,

I am new to python and biopython. I ran into a problem when using 
Entrez.esearch and efetch.  My script worked fine when I used python 
2.6.2 command line (console), but it returned an empty line when I ran 
it in IDLE.  IDLE seems to be working, because I tested with 1. another 
python script (no Entrez modules) and 2. even Entrez.einfo--worked 
fine.  I am using Windows Vista, 64-bit and Biopython 1.51 and Python 
2.6.2.
Thanks in advance,

Andrew