要求：用法：find_mapped_reads.py返回一个仅包含映射指定区域内读取的fasta文件。python3 find_mapped_reads.py [fasta file with reads] [m5 mapping output from blasr] [start index] [end index] [output file name]示例：python3 find_mapped_reads.py reads.fa mapping.m5 100 5100 reads_100_5100.faflex.py从多序列比对输出创建一致序列。python3 flex.py [fasta file output from Muscle] [minimum number of non-gap nucleotides] [nucleotide pe