Question

我有一个这样的清单：

['>ENST00000262144 cds:known chromosome:GRCh37:16:74907468:75019046:-1 gene:ENSG00000103091 gene_biotype:protein_coding transcript_biotype:protein_coding', 
 '>ENST00000446813 cds:known chromosome:GRCh37:7:72349936:72419009:1 gene:ENSG00000196313 gene_biotype:protein_coding transcript_biotype:protein_coding']

我想创建一个具有相同维度和顺序的新列表，但在新列表中我将仅保留基因ID。结果将是这样的：

['ENSG00000103091', 'ENSG00000196313']

我正在使用python。你们知道怎么做吗？感谢

Answer 1

使用一些基本的列表理解：

lst = ['>ENST00000262144 cds:known chromosome:GRCh37:16:74907468:75019046:-1 gene:ENSG00000103091 gene_biotype:protein_coding transcript_biotype:protein_coding', '>ENST00000446813 cds:known chromosome:GRCh37:7:72349936:72419009:1 gene:ENSG00000196313 gene_biotype:protein_coding transcript_biotype:protein_coding']

res = [el[5:] for s in lst for el in s.split() if el.startswith('gene:')]

如果您更喜欢使用常规for循环，请使用：

lst = ['>ENST00000262144 cds:known chromosome:GRCh37:16:74907468:75019046:-1 gene:ENSG00000103091 gene_biotype:protein_coding transcript_biotype:protein_coding', '>ENST00000446813 cds:known chromosome:GRCh37:7:72349936:72419009:1 gene:ENSG00000196313 gene_biotype:protein_coding transcript_biotype:protein_coding']

res = []
for el in lst: # for each string in your list
    l = el.split() # create a second list, of split strings
    for s in l: # for each string in the 'split strings' list
        if s.startswith('gene:'): # if the string starts with 'gene:' we know we have match
            res.append(s[5:]) # so skip the 'gene:' part of the string, and append the rest to a list

Answer 2

For each string in the list:
    Split the string on spaces (Python **split** command)
    Find the element starting with "gene:"
    Keep the rest of the string (grab the slice [5:] of that element)

你有足够的基本Python知识从那里获取它吗？如果没有，我建议您咨询string method documentation。

Answer 3

这绝不是实现这一目标的最恐怖的方式，但它应该做你想要的。

l = [
    '>ENST00000262144 cds:known chromosome:GRCh37:16:74907468:75019046:-1 gene:ENSG00000103091 gene_biotype:protein_coding transcript_biotype:protein_coding',
    '>ENST00000446813 cds:known chromosome:GRCh37:7:72349936:72419009:1 gene:ENSG00000196313 gene_biotype:protein_coding transcript_biotype:protein_coding'
]
genes = []
for e in l:
    e = e.split('gene:')
    gene = ''
    for c in e[1]:
        if c != ' ':
            gene += c
        else:
            break
    genes.append(gene)

print(genes)

循环遍历列表中的元素，然后在gene:之后将它们拆分，然后将所有字符附加到字符串并将其添加到数组中。

从基因列表中删除元素

3 个答案: