def fm_index_path(genome):
"""
Returns a path for cached reference peptides, for the given genome.
"""
cache_dir = user_cache_dir('vaxrank')
if not os.path.exists(cache_dir):
os.makedirs(cache_dir)
return os.path.join(cache_dir, '%s_%d_%d.fm' % (
genome.species.latin_name, genome.release, 2 if six.PY2 else 3))
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