我正在编写一个类的函数来将sam文件转换为bam文件,然后对它进行排序并在python中对其进行索引(我知道它很容易在bash中实现,但是了解更多内容并没有什么坏处。) / p>
已经由该类的另一个函数在已定义的目录(cwd)中生成了一个sam文件。
以下是代码:
def sam2bam(self):
"""
return a sorted and index bam file in the working directory
"""
if str(self.fq)[7:9] == '24':
# create bam
comnd = "samtools view -bS " + str(self.fq)[0:10] + ".sam > " + str(self.fq)[0:10] + ".bam"
print("Converting sam to bam ... (executed command: {})\n".format(comnd))
comnd_input = shlex.split(comnd)
with open((str(self.fq)[0:10] + '.bam'), 'w') as f:
Popen(comnd_input, stdout = f, stderr = PIPE, cwd = 'G24/' + str(self.fq))
# sort bam
comnd2 = "samtools sort " + str(self.fq)[0:10] + ".bam -o " + str(self.fq)[0:10] + ".sorted.bam"
print('Sorting bam ... (executed command: {}\n)'.format(comnd2))
comnd_input2 = shlex.split(comnd2)
with open((str(self.fq)[0:10] + 'sorted.bam'), 'w') as f_sort:
Popen(comnd_input2, stdout = f_sort, stderr = PIPE, cwd = 'G24/' + str(self.fq))
# index bam
comnd3 = "samtools index " + str(self.fq)[0:10] + ".sorted.bam"
print('Indexing bam ... (executed command: {}\n)'.format(comnd3))
comnd_input3 = shlex.split(comnd3)
with open((str(self.fq)[0:10] + 'sorted.bam'), 'w') as f_index:
Popen(comnd_input3, stdout = f_index, stderr = PIPE, cwd = 'G24/' + str(self.fq))
但没有出现
我试过了:
Popen(comnd_input, stdout = PIPE, stderr = PIPE, cwd = 'G24/' + str(self.fq))
但也没有。尝试将其保存为变量并执行.communicate(),没有。
所以我不知道自己做错了什么?
感谢,
XP的
答案 0 :(得分:0)
参考here.
这是因为'>'重定向。我将代码修改为:
Popen(comnd, stdout = PIPE, stderr = PIPE, shell = True, cwd = 'G14/' + str(self.fq))
它有效。