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使用字符列表在输出中重复写入-python

fasta biopython bioinformatics python

0

F.Lira · 技术社区 · 6 年前

在一个文件中,我有一些字符需要替换。

字母=[“B”,“Z”,“J”,“U”,“O”]

for record in SeqIO.parse(inFile, "fasta"):
    for letter in letters:
        if letters in str(record.seq):
            print record.id 
            record.seq = str(record.seq).replace(letter, "X")
            outFile.write(">%s\n%s\n" % (record.description, record.seq))
        else:
            outFile.write(">%s\n%s\n" % (record.description, record.seq))
            #pass

> >ID:WP_004160595.1|Erwinia_amylovora_01SFR-BO|01SFR-BO|50S_ribosomal_protei..|630|NZ_CAPA01000010(58437):26053-26682:-1
> MIGLVGKKVGMTRIFTEDGVSIPVTVIEIEANRVTQVKGLENDGYTAIQVTTGAKKANRVTKPAAGHFAKAGVEAGRGLWEFRTAEGAEFTVGQSINVDIFADVKKVDVTGTSKGKGFAGTVKRWNFRTQDATHGNSLSHRVPGSIGQNQTPGKVFKGKKMAGQLGNERVTVQSLDVVRVDAERNLLLVKGAVPGATGSDLIVKPAVKA
> >ID:WP_004160595.1|Erwinia_amylovora_01SFR-BO|01SFR-BO|50S_ribosomal_protei..|630|NZ_CAPA01000010(58437):26053-26682:-1
> MIGLVGKKVGMTRIFTEDGVSIPVTVIEIEANRVTQVKGLENDGYTAIQVTTGAKKANRVTKPAAGHFAKAGVEAGRGLWEFRTAEGAEFTVGQSINVDIFADVKKVDVTGTSKGKGFAGTVKRWNFRTQDATHGNSLSHRVPGSIGQNQTPGKVFKGKKMAGQLGNERVTVQSLDVVRVDAERNLLLVKGAVPGATGSDLIVKPAVKA
> >ID:WP_004160595.1|Erwinia_amylovora_01SFR-BO|01SFR-BO|50S_ribosomal_protei..|630|NZ_CAPA01000010(58437):26053-26682:-1
> MIGLVGKKVGMTRIFTEDGVSIPVTVIEIEANRVTQVKGLENDGYTAIQVTTGAKKANRVTKPAAGHFAKAGVEAGRGLWEFRTAEGAEFTVGQSINVDIFADVKKVDVTGTSKGKGFAGTVKRWNFRTQDATHGNSLSHRVPGSIGQNQTPGKVFKGKKMAGQLGNERVTVQSLDVVRVDAERNLLLVKGAVPGATGSDLIVKPAVKA
> >ID:WP_004160595.1|Erwinia_amylovora_01SFR-BO|01SFR-BO|50S_ribosomal_protei..|630|NZ_CAPA01000010(58437):26053-26682:-1
> MIGLVGKKVGMTRIFTEDGVSIPVTVIEIEANRVTQVKGLENDGYTAIQVTTGAKKANRVTKPAAGHFAKAGVEAGRGLWEFRTAEGAEFTVGQSINVDIFADVKKVDVTGTSKGKGFAGTVKRWNFRTQDATHGNSLSHRVPGSIGQNQTPGKVFKGKKMAGQLGNERVTVQSLDVVRVDAERNLLLVKGAVPGATGSDLIVKPAVKA
> >ID:WP_004160595.1|Erwinia_amylovora_01SFR-BO|01SFR-BO|50S_ribosomal_protei..|630|NZ_CAPA01000010(58437):26053-26682:-1
> MIGLVGKKVGMTRIFTEDGVSIPVTVIEIEANRVTQVKGLENDGYTAIQVTTGAKKANRVTKPAAGHFAKAGVEAGRGLWEFRTAEGAEFTVGQSINVDIFADVKKVDVTGTSKGKGFAGTVKRWNFRTQDATHGNSLSHRVPGSIGQNQTPGKVFKGKKMAGQLGNERVTVQSLDVVRVDAERNLLLVKGAVPGATGSDLIVKPAVKA

2 回复 | 直到 6 年前

1

4

Chris_Rands 6 年前

我想你要做的是替换模棱两可的 IUPAC amino acid codes (加上一些你不知何故获得的额外信件?) 'X' .

更好地使用 str.translate() (在python3中)一次完成所有替换。另外,由于您使用Biopython读取文件,因此也可以使用Biopython轻松地编写输出文件。

from Bio import SeqIO
from Bio.Seq import Seq

letters = ["B", "Z", "J", "U", "O"]
trans_tab = str.maketrans(''.join(letters), 'X'*len(letters))

def yield_seqs(in_file):
    for record in SeqIO.parse(in_file, 'fasta'):
        record.seq = Seq(str(record.seq).translate(trans_tab))
        yield record

SeqIO.write(yield_seqs('input.fasta'), 'output.fasta', 'fasta')

$ cat input.fasta 
>1
MBZJ
$ python3 myscript.py
$ cat output.fasta 
>1
MXXX

2

1

blue_note 6 年前

你打错了。

if letters in str(record.seq):

if letter in str(record.seq)

所以,你的支票总是不通过,然后打印 else 每一个字母的部分。