如何使用子进程在python循环中运行shell程序？

Question

num_of_files = 12 
pair_count = 1 
while pair_count < num_of_files: 
    for root, dirs, all_files in os.walk(indir): 
     read1 = all_files[pair_count] 
     pair_count += 1 
     read2 = all_files[pair_count] 
     print(read1, read2) 
     pair_count += 1 
     process = subprocess.Popen 
(cutadapt -a AATGATACGGCGACCACCGAGATCTACACGCCTCCCTCGCGCCATCAG 
-o out1.fastq -p out.2fastq read1 read2, shell=True, stdout=subprocess.PIPE) 
if pair_count > num_of_files: 
     break 

我似乎无法在我的python循环中使用cutadapt shell脚本。它给当我运行了以下错误信息：

process = subprocess.Popen(cutadapt -a AATGATACGGCGACCACCGAGATCTACACGCCTCCCTCGCGCCATCAG 
-o out1.fastq -p out.2fastq read1 read2, shell=True, stdout=subprocess.PIPE) 

         SyntaxError: invalid syntax         ^

错误表示字符串的结尾......我不知道这可能是什么语法错误。

任何帮助，这将不胜感激

Answer 1

从文档，它看起来像论据subprocess.Popen应弦的字符串或列表。

是否

subprocess.Popen(["cutadapt", "-a", "AATGATACGGCGACCACCGAGATCTACACGCCTCCCTCGCGCCATCAG", "-o", "out1.fastq", "-p", "out.2fastq", "read1", "read2"], shell=True, stdout=subprocess.PIPE)

提供所需的呼叫？

从文档：

>>> import shlex, subprocess 
>>> command_line = raw_input() 
/bin/vikings -input eggs.txt -output "spam spam.txt" -cmd "echo '$MONEY'" 
>>> args = shlex.split(command_line) 
>>> print args 
['/bin/vikings', '-input', 'eggs.txt', '-output', 'spam spam.txt', '-cmd', "echo '$MONEY'"] 
>>> p = subprocess.Popen(args) # Success! 

请特别注意，选项（如 - 输入）和由空格在外壳分隔参数（如eggs.txt）在单独的列表中的元素去，而在shell中使用时需要引用或反斜杠转义的参数（如包含空格的文件名或上面显示的echo命令）是单列表元素。

https://docs.python.org/2/library/subprocess.html#popen-constructor