如何截取根字符串周围的字符串

Question

如何在csv文件中切断根字符串周围的字符串？有什么解决办法吗？ 我在另一个专栏的句子中有我的根字符串

例如，我有：

lack of association between the promoter polymorphism of the mtnr1a gene and adolescent idiopathic scoliosis

我的根字符串：mtnr1a，我想要输出：

promoter polymorphism of the mtnr1a gene and adolescent idiopathic

Answer 1

如果您只想在“根字符串”第一次出现的两边各有4个单词，可以使用：

root = 'mtnr1a'
s = 'lack of association between the promoter polymorphism of the mtnr1a gene and adolescent idiopathic scoliosis'
s_list = s.split(' ')
ix = s_list.index(root)

out = ' '.join(s_list[-4+ix:ix+5])
out
# returns:
'promoter polymorphism of the mtnr1a gene and adolescent idiopathic'

Answer 2

将句子转换成单词列表，然后找到根字符串的索引应该可以完成以下工作：

sentence = "lack of association between the promoter polymorphism of the mtnr1a gene and adolescent idiopathic scoliosis"
root = "mtnr1a"

try:
    words = sentence.split()
    n = words.index(root)
    cutoff = ' '.join(words[n-4:n+5])
except ValueError:
    cutoff = None

print(cutoff)

结果：

promoter polymorphism of the mtnr1a gene and adolescent idiopathic

注意：当在句子中找不到根字符串时，需要捕获ValueError。在这种情况下，cutoff被设置为None