python中提取原始序列名字第一个空格前的名字作为的序列名字，输出到屏幕

001、

(base) [email protected]:/home/test2# ls
a.fasta  test.py
(base) [email protected]:/home/test2# cat a.fasta           ## 测试fasta文件
>gene1 myc
AGCTGCCTAAGC
GGCATAGCTAATCG
>gene2 jun
ACCGAATCGGAGCGATG
GGCATTAAAGATCTAGCT
>gene3 malat1
AGGCTAGCGAG
GCGCGAG
GATTAGGCG
(base) [email protected]:/home/test2# cat test.py           ## 测试程序
#!/usr/bin/python

in_file = open("a.fasta", "r")

for i in in_file:
    i = i.strip()
    if i.startswith(">"):
        print(i.split(" ")[0].split(">")[1])
    else:
        print(i)

(base) [email protected]:/home/test2# python test.py        ## 运行程序
gene1
AGCTGCCTAAGC
GGCATAGCTAATCG
gene2
ACCGAATCGGAGCGATG
GGCATTAAAGATCTAGCT
gene3
AGGCTAGCGAG
GCGCGAG
GATTAGGCG

参考：https://www.jianshu.com/p/403a23fdd7bb