[Biopython] Specifying variable bases in search sequences.

[Ryan J. Hope]

Hello everyone,
I have a script which searches fasta files for -10 and -35 consensus sequences. In my -10 sequence only 2 out of the 6 bases are conserved. How may I search for variable bases for the 4 which are not conserved. I have tried using ’n’ in place of an actual base however this doesn’t produce any results. See .py file attached. 

Kind regards,
Ryan.
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