Adds taxonomy level prefixes smilar to Greengenes' to RDP output

add_taxonomy_prefixes.py

#!/usr/bin/env python

from sys import argv

prefixes = ['k__', 'p__', 'c__', 'o__', 'f__', 'g__', 's__']

with open(argv[1], 'U') as input_f, open(argv[2], 'w') as output_f:
    for line in input_f:
        otu_id, tax, p = line.strip().split('\t')
        tax = '; '.join([''.join(x) for x in zip(prefixes, tax.split(';'))])
        output_f.write('\t'.join([otu_id, tax, p]) + '\n')