read_genome.seq

def read_genome(filename):
    genome: str = '' 
    with open(filename, 'r') as f:
        for line in f:
            if not line[0] == '>':
                # print "adding", line
                genome += line.rstrip()
    return genome

genome = read_genome('lambda_virus.fa')
print genome[:100]
print len(genome)