#! /usr/bin/env python

'''
adding a poly-T tail to a sequence
'''

#define a function that will add the T tail
def add_tail(seq):
    result = seq + 'TTTTTTTTTTTTTTTTTTTTT'
    return result

#open the file
dnafile = 'AY162388.seq'
file = open(dnafile, 'r')

#read the sequence and strip the carriage returns
sequence = ''
for line in file:
    sequence += line.strip()


print sequence
#call the function to add the poly-T tail
sequence = add_tail(sequence)
print sequence