def gen_fasta2phy_cmd(fasta_file, phylip_file):
    """
    Returns a "fasta2phy" command <list>
    Input:
        fasta_file <str>    -- path to fasta file
        phylip_file <str>   -- path to output phylip file
    """ 
    return ['fasta2phy', '-i', fasta_file, '-o', phylip_file]