def writeFasta(sequence, sequence_name, output_file):
    """
    Writes a fasta sequence into a file.

    :param sequence: a string with the sequence to be written
    :param sequence_name: name of the the fasta sequence
    :param output_file: /path/to/file.fa to be written

    :returns: nothing
    """
    i = 0
    f = open(output_file, 'w')
    f.write('>' + str(sequence_name) + '\n')
    while i <= len(sequence):
        f.write(sequence[i:i + 60] + '\n')
        i = i + 60
    f.close()
