#!/usr/bin/env python
import sys
from Bio import SeqIO
from os.path import exists
from dark.aa import CODONS
START_CODON = 'ATG'
STOP_CODONS = {'TAA', 'TAG', 'TGA'}
CODON_TO_AA = {}
START_AA = 'M'
STOP_AA = '*'
for aa, codons in CODONS.items():
for codon in codons:
CODON_TO_AA[codon] = aa
for codon in STOP_CODONS:
CODON_TO_AA[codon] = STOP_AA
_rcTable = str.maketrans('ACGT', 'TGCA')
def revcomp(s):
"""
Reverse complement a nucleotide string.
"""
return s.translate(_rcTable)[::-1]
