Indexowanie obiektów SeqRecord w liście

for x in f:
    ind = f.index(x)
    print(ind)

0
Traceback (most recent call last):

File "C:\Users\...", line 43, in <module>
ind = f.index(x)

File "C:\Users\...\anaconda3\lib\site-packages\Bio\SeqRecord.py", line 803, in __eq__
raise NotImplementedError(_NO_SEQRECORD_COMPARISON)

NotImplementedError: SeqRecord comparison is deliberately not implemented. Explicitly compare the 
attributes of interest.

[SeqRecord(seq=Seq('CCCGGGKKGGGKACTGCGGGAGGWCATTGTCGAACCTGCCCGACAGAGCGACCC...GAA', IUPACAmbiguousDNA()), id='BIE-1_ITS5', name='BIE-1_ITS5_F', description='', dbxrefs=[]), SeqRecord(seq=Seq('GCGTGKGRAKACTGCGAGAGGWCATTGTCGAACCTGCCCGACAGAGCGACCCGC...AAA', IUPACAmbiguousDNA()), id='BIE-2_ITS5', name='BIE-2_ITS5_F', description='', dbxrefs=[]), SeqRecord(seq=Seq('GCGGGTGGAKACTGCGGAGGWCATTGTCGAACCTGCCCGACAGAGCGACCCGCG...AAA', IUPACAmbiguousDNA()), id='BIE-3_ITS5', name='BIE-3_ITS5_F', description='', dbxrefs=[])]

for i, _ in enumerate(f):
    print(i)