以下のエラーを解決する方法を教えてもらえますか?
>>> from Bio import SeqIO
>>> sizes=[len(rec) for rec in SeqIO.parse("CE2Kb_2Kb_F01_2124_5.fasta", "fasta")
len(seq), min(seq), max(seq)
>>> sizes
**Traceback (most recent call last):
File "<pyshell#32>", line 1, in <module>
sizes
NameError: name 'sizes' is not defined**