我在努力读书 fna 文件 mrjob 在python中。
这是我的 load_read.py 程序中，所有的代码都可以正常工作而不用使用 mrjob .

from mrjob.job import MRJob
from Bio import SeqIO
from Bio.Seq import Seq
import re
from operator import itemgetter 
import sys

def format_read(read):
    z = re.split('[|={,]+', read.description)
    return read.seq, z[3]

class LoadMetaRead(MRJob):

    def mapper_raw(self, file_path, file_uri):
        from Bio import SeqIO
        from Bio.Seq import Seq

        seqs = list(SeqIO.parse(file_path, type='fna'))

        is_paired_end = False
        if len(seqs) > 2 and seqs[0].id[-1:] != seqs[1].id[-1:]:
            is_paired_end = True

        label_list = dict()
        label_index = 0

        for i in range(0, len(seqs), 2 if is_paired_end else 1):
            read, label = format_read(seqs[i])
            if is_paired_end:
                read2, _ = format_read(seqs[i + 1])
                read += read2

            if label not in label_list:
                label_list[label] = label_index
                label_index += 1

            yield str(i), str(read), str(label_list[label])            

    def mapper(self, _, line):
        yield 'read', line

    def reducer(self, key, values):
        yield key, values

    combiner = reducer

if __name__ == '__main__':
    LoadMetaRead.run()

数据文件示例 R4.fna :

>r1.1 |SOURCES={GI=15668172,fw,1146130-1146958}|ERRORS={52_1:A,78_1:G,78_2:G,78_3:G,641_1:G}|SOURCE_1="Methanocaldococcus jannaschii DSM 2661 chromosome" (392b1054a4bf536ea1cc349545ace50120973c3a)
AAACCCTCTTCCACGAACCCTCTTGAAAATCCCCCACATCCACAAAATAAATCAAATAAATTTCA
ACATTATCACCAAAAGGGTAAAAGGTTATTTAAAAAATAAAATAAATTTAAAAATTTAAATTAAA
TACCAAAAAAGCCAAATAACTTATTGTGATTCTTGAGCTTTCTTTAACTCTGCCTTCATATCTTG
ATAGACTTTAGTCCATTTTAATTTTCTTGGATTTCTTCCCATTCTGTAGCTTTTCTCACATTTGG
ATGAGCAGAAATATAATACAGTCCCATCTTTTTCTACGACCATTTTTCCTTTTCCTGGCTCAATT
TCATAACCACAAAAGCTGCATGTTCTCCATTCTGGCATAGCTATCCCCCTTTAATAGTGTTTCAG
TGATTTTAAAATAATTTAAGATTAAATTATTTATCTTCTTCTGTCTAATGGTCTTGCTTCTCTCT
CTGTTTCTCTTAACATAATAATGTCTCCAACTTTAACTGGACCTTTAACGTTTCTAACTAAAACT
CTTCCAGTATCTTTTCCACCTAAGATTTTACATCTAACTTGTATAATTCCTCCAGTAACCCCTGT
TCTACCAATGACTTCAATAACTTCAGCAGCTACTGCTTCCTTATAAACAAATTCATCTTCCGATC
CTCATCACCTAATATTAATGAAGGTTTAAAATTTATAAAAAAGTTAGTAGTAGTGTTTCATAATT
TATATAATAATAACTATATACTATTGATTGATGGTTAAATAGCGTTCTAATAATTTACTGCTTCA
AAACATTTACCTTTTCAATTAATACCTTTAACTCTTCAGCATCTCCTTCGTTG
>r2.1 |SOURCES={GI=15668172,bw,239211-239971}|ERRORS={113:-,217_1:C,281_1:G,627_1:G,717_1:T}|SOURCE_1="Methanocaldococcus jannaschii DSM 2661 chromosome" (392b1054a4bf536ea1cc349545ace50120973c3a)
TAGCATGTAAATCCCTTATTTCTTAATTTCTCCCAGAATTATTTCTATTGCTTTATCAACTGCCT
TGGCAACCTCTTCAGACAACCCTGGTTTTATGTCTGGCATTGTAAATTTTTACCTTGACAACCAA
TAACCACGACTTCTATGCCTTTATTATGTAAATCTTTGAGAAATGGGGCTAATGGAACGTTATGG
GCATCGAAAGAATATTTTTTAACTATTCGGTAATTCATCAACATCTATCTTTTTTATTGTTCCAG
GTTCTAAATCAAAATCAATGGCGATCAACAACAATAATCTTTTTTATATCTTCATCAACCAACGT
CATTAAATAGTATGCTCCACTTGCCCCAGCATCTATAACTTCAACGTTATCTGGCAAGTTCATTT
TTTCTAATTTGCTAACAACCTCACATCCAAAGCCATCATCTCCAAACAACAGATTTCCACAACCA
ACAATTAATATATCCTTCTTTTTCATTTTATCACTTATTTAGCATTTCTTTATATTTTTTAGCCT
CTTCTTTAGGATTTTGTGATTGATAGATTGCCCTTCCAACAATGACGTAATCATTCTCATCTAAA
ATATTTAAAATATCCTCAATCTTCCCTCCCTGAGCTCCGACTCCGTGGTGTTATTACTGGCAATT
CTGCAATTTCTTTAATTTCTTTAAGCCTTTCAGGCCTTGTTGATGGAGCAACTATAGCATCAACT
TTTAGTTTTTTTAGCCATCTCTGACAATTTATCTGCTATTGGCTGTAG

当我用这个命令运行程序时：

python load_read.py R4.fna

它会引发以下错误：

ValueError: Can't specify both mapper_raw and mapper

你知道怎么修吗？