python按行读取字符串-python处理多行字符串将第一行进行修改
以源代码从网站 KEGG-API获取了所需要的文本，其格式如下：
[字符串1]:
b">hsa:10056 K01890 phenylalanyl-tRNA synthetase beta chain [EC:6.1.1.20] | (RefSeq) FARSB, FARSLB, FRSB, HSPC173, NEDBLLA, PheHB, PheRS; phenylalanyl-tRNA synthetase subunit beta (A) MPTVSVKRDLLFQALGRTYTDEEFDELCFEFGLELDEITSEKEIISKEQGNVKAAGASDV VLYKIDVPANRYDLLCLEGLVRGLQVFKERIKAPVYKRVMPDGKIQKLIITEETAKIRPF AVAAVLRNIKFTKDRYDSFIELQEKLHQNICRKRALVAIGTHDLDTLSGPFTYTAKRPSD IKFKPLNKTKEYTACELMNIYKTDNHLKHYLHIIENKPLYPVIYDSNGVVLSMPPIINGD HSRITVNTRNIFIECTGTDFTKAKIVLDIIVTMFSEYCENQFTVEAAEVVFPNGKSHTFP ELAYRKEMVRADLINKKVGIRETPENLAKLLTRMYLKSEVIGDGNQIEIEIPPTRADIIH ACDIVEDAAIAYGYNNIQMTLPKTYTIANQFPLNKLTELLRHDMAAAGFTEALTFALCSQ EDIADKLGVDISATKAVHISNPKTAEFQVARTTLLPGLLKTIAANRKMPLPLKLFEISDI VIKDSNTDVGAKNYRHLCAVYYNKNPGFEIIHGLLDRIMQLLDVPPGEDKGGYVIKASEG PAFFPGRCAEIFARGQSVGKLGVLHPDVITKFELTMPCSSLEINVGPFL "
处理成utf-8格式后：
[字符串2]：
>hsa:10056 K01890 phenylalanyl-tRNA synthetase beta chain [EC:6.1.1.20] | (RefSeq) FARSB, FARSLB, FRSB, HSPC173, NEDBLLA, PheHB, PheRS; phenylalanyl-tRNA synthetase subunit beta (A)
MPTVSVKRDLLFQALGRTYTDEEFDELCFEFGLELDEITSEKEIISKEQGNVKAAGASDV
VLYKIDVPANRYDLLCLEGLVRGLQVFKERIKAPVYKRVMPDGKIQKLIITEETAKIRPF
AVAAVLRNIKFTKDRYDSFIELQEKLHQNICRKRALVAIGTHDLDTLSGPFTYTAKRPSD
IKFKPLNKTKEYTACELMNIYKTDNHLKHYLHIIENKPLYPVIYDSNGVVLSMPPIINGD
HSRITVNTRNIFIECTGTDFTKAKIVLDIIVTMFSEYCENQFTVEAAEVVFPNGKSHTFP
ELAYRKEMVRADLINKKVGIRETPENLAKLLTRMYLKSEVIGDGNQIEIEIPPTRADIIH
ACDIVEDAAIAYGYNNIQMTLPKTYTIANQFPLNKLTELLRHDMAAAGFTEALTFALCSQ
EDIADKLGVDISATKAVHISNPKTAEFQVARTTLLPGLLKTIAANRKMPLPLKLFEISDI
VIKDSNTDVGAKNYRHLCAVYYNKNPGFEIIHGLLDRIMQLLDVPPGEDKGGYVIKASEG
PAFFPGRCAEIFARGQSVGKLGVLHPDVITKFELTMPCSSLEINVGPFL
现在我的目标是将第一行空格后的数据删除，其余不修改，完成如下：
[字符串3]：
>hsa:10056
MPTVSVKRDLLFQALGRTYTDEEFDELCFEFGLELDEITSEKEIISKEQGNVKAAGASDV
VLYKIDVPANRYDLLCLEGLVRGLQVFKERIKAPVYKRVMPDGKIQKLIITEETAKIRPF
AVAAVLRNIKFTKDRYDSFIELQEKLHQNICRKRALVAIGTHDLDTLSGPFTYTAKRPSD
IKFKPLNKTKEYTACELMNIYKTDNHLKHYLHIIENKPLYPVIYDSNGVVLSMPPIINGD
HSRITVNTRNIFIECTGTDFTKAKIVLDIIVTMFSEYCENQFTVEAAEVVFPNGKSHTFP
ELAYRKEMVRADLINKKVGIRETPENLAKLLTRMYLKSEVIGDGNQIEIEIPPTRADIIH
ACDIVEDAAIAYGYNNIQMTLPKTYTIANQFPLNKLTELLRHDMAAAGFTEALTFALCSQ
EDIADKLGVDISATKAVHISNPKTAEFQVARTTLLPGLLKTIAANRKMPLPLKLFEISDI
VIKDSNTDVGAKNYRHLCAVYYNKNPGFEIIHGLLDRIMQLLDVPPGEDKGGYVIKASEG
PAFFPGRCAEIFARGQSVGKLGVLHPDVITKFELTMPCSSLEINVGPFL
现在我的问题是：
如何获取文本后，不保存为为文件，直接对多行字符串进行处理，然后再保存为文件？
因为将获取的文本写入文件，然后再去处理这个文件感觉多此一举。
这是获取文本的代码：
def getHtml(url): #获取网页源代码
request = urllib.request.Request(url)
response = urllib.request.urlopen(request)
return response.read().decode("utf-8")
url1 = "http://rest.kegg.jp/get/hsa:10056/aaseq"
text = getHtml(url1)
其中获取的"text’内容如上[字符串2]所示
我知道可以使用split切除第一行：
>>>str1 = "hsa:10056 K01890 phenylalanyl-tRNA synthetase beta chain [EC:6.1.1.20] | (RefSeq) FARSB, FARSLB, FRSB, HSPC173, NEDBLLA, PheHB, PheRS; phenylalanyl-tRNA synthetase subunit beta (A)"
>>>str2 = str1.split(" ")[:1]
>>>print(str2)
["hsa:10056"]
但现在问题是，"text"是个多行字符串，我只要处理它的第一行，不知道如何解决？