Deconvolutes ids from `attributes` column in GFF3 to seprate columns.
    :param s: attribute string.
    :returns: tuple of ids

def gffatributes2ids(s):
    """
    Deconvolutes ids from `attributes` column in GFF3 to seprate columns.
    :param s: attribute string.
    :returns: tuple of ids
    """
    Name,gene_id,transcript_id,protein_id,exon_id=np.nan,np.nan,np.nan,np.nan,np.nan
    if '=' in s:
        d=dict([i.split('=') for i in s.split(';')])
        if 'Parent' in d:
            d[d['Parent'].split(':')[0]+'_id']=d['Parent'].split(':')[1]
        Name,gene_id,transcript_id,protein_id,exon_id=np.nan,np.nan,np.nan,np.nan,np.nan
        if 'Name' in d:    
            Name=d['Name']
        if 'gene_id' in d:    
            gene_id=d['gene_id']
        if 'transcript_id' in d:    
            transcript_id=d['transcript_id']
        if 'protein_id' in d:    
            protein_id=d['protein_id']
        if 'exon_id' in d:    
            exon_id=d['exon_id']
    return Name,gene_id,transcript_id,protein_id,exon_id