报错：
import Levenshtein
ImportError: No module named Levenshtein
from Bio import SeqIO
ImportError: No module named Bio
解决：
pip install python-Levenshtein
ref:https://pypi.org/project/python-Levenshtein/
pip install biopython
ref:https://pypi.org/project/biopython/
module和真正的名字不一样，坑人呢这是。
