[Biopython] PSI-BLAST help

[Alaguraj Veluchamy]

Dear all,
I have a problem in database search using PSI-BLAST.
I have to do PSI-BLAST against combined "nr" and "environmental
sequences(env_nr)" databases.
I need to iterate 10 rounds.
Web services allow selecting one database at a time.

Do Biopython offers search against multiple databases.
I am unable to find any simple way to do this.

Regards,
Alaguraj.V